Numark Industries Music Mixer DM1200 User Manual

Professional Disc Jockey Products  
DM1200/DM1235/DM1285 STEREO MIXER  
OWNER’S MANUAL  
INDUSTRIES  
11 Helmsman Avenue, North Kingstown, RI 02852  
 
DM1 2 0 0 / DM1 2 3 5 / DM1 2 8 5  
NUMARK DM1200/DM1235/DM1285 STEREO MIXER  
INDEX  
Safety Information  
Product Registration  
Page 2  
Page 4  
Introduction  
Features  
System Precautions  
Front Panel Diagrams  
Page 5  
Page 6  
Page 7  
Guided Tour of Features  
Operating Instructions  
DM1235 Beatkeeper Operation  
DM1285 Sampler Operation  
Rear Panel Diagram and Features  
Connection Diagram  
Page 10  
Page 14  
Page 16  
Page 17  
Page 18  
Page 19  
Rear Cover  
Specifications  
Block Diagram  
Warranty and Service  
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DM1 2 0 0 / DM1 2 3 5 / DM1 2 8 5  
CONGRATULATIONS!  
You have purchased a quality stereo mixer designed and manufactured by  
This equipment features all new circuitry and the latest in manufacturing and design  
technology to give you greater quality and better reliability than ever before.  
This mixer brings to you the finest quality of DJ equipment available today.  
.
Thank you for buying Numark DJ products!  
DM1 2 0 0 FEATURES...  
User replaceable assignable ALPs™ crossfader  
Balanced XLR Outputs  
Dedicated DJ Mic and Second Mic Channel  
with 2 Band EQ and Talk-over dual control  
Split cue headphone monitoring with  
cross-fader  
Dual 6-band graphic equalizer  
with In/Out switch  
Master and Zone level controls  
Neutrik™ “Combo” connector allows 1/4” or  
XLR plug to be used for DJ Mic  
5-8 switchable line inputs  
Stereo/Mono switch on the Master and Zone  
Tape Out for direct recording  
Powerful stereo headphone output  
Push button cueing  
Three phono inputs  
High-end performance audio signal  
12V BNC light connector  
theBEATKEEPER  
DM1 2 3 5 wit h  
FEATURES...  
DM1 2 8 5 wit h SAMPLER  
FEATURES...  
Automatic BPM tracking of up to 8 input  
sources (4 simultaneously)  
True 16-bit CD quality audio and powerful  
recording, editing and playback options  
Accurate digital BPM displays  
Re-triggering for stuttering “rap”-style effects  
Effect Level Fader  
Visual live tracking of your mix progress, using  
Tempo Difference and Beat Offset Bar Graphs  
All visual displays update on every beat  
Sync Lock Button for accurate BPM tracking  
Beat Assist for locking to the correct beat  
Simple user interface  
Large Start-Stop button  
Digital processor modes: -  
-Edit (allows Intro and/or Outro trimming of the  
sample after it is recorded)  
-Single (sample plays once)  
-Repeat (loops sample until disengaged)  
-Stutter (for "stutters" and "stabs" in single or  
repeat mode)  
Once you've synced your Beatkeeper you've opened  
a whole new dimension in mixing. The Beatkeeper has two  
bar graphs - one showing the tempo difference, and the  
other showing the beat offset. Now you can see when your  
mix is on track. If the beats start to drift, you'll be able to  
easily adjust the music before your audience can hear it.  
-Speed Control (plays sample faster or slower  
than originally recorded resulting in frequency  
shift)  
-Monitor (for monitoring sample with or without  
program or cue audio output)  
-Write (safely record a sample)  
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DM1 2 0 0 / DM1 2 3 5 / DM1 2 8 5  
IMPORTANT INFORMATION...  
Please read this entire manual before  
connecting the DM1200 to your system.  
For optimum performance:  
SYSTEM PRECAUTIONS  
• Use appropriate cables throughout your system:  
Quality shielded audio cables and terminated  
shielded video cables, low-capacitance  
preferred. Speaker cables must be 14-gauge  
minimum; 12- or 10-gauge is better.  
• Always make sure that AC power is OFF while  
making any connections.  
• Do not use excessively long cables (i.e. over  
50ft/14m) Be sure plugs and jacks are tightly  
mated. Loose connections can cause hum, noise  
or intermittents that could easily damage your  
speakers.  
• Reliability will be enhanced through the use of  
banana connectors on the speaker wires.  
Observe correct speaker wire polarity. If in  
doubt, consult your Numark dealer or a qualified  
technician.  
• Never use spray cleaners or oils on  
the slide controls. Residues cause  
excessive dirt build-up and this will  
void your warranty. In normal use  
slide controls can last for many  
years. If they malfunction (usually  
because of a dirty or dusty  
• Take care to connect only one cable at a time.  
Pay attention to the color-coded, labeled Input  
and Output jacks.  
• ALWAYS remember: “TURN AMPS ON LAST  
AND OFF FIRST”. Begin with master faders or  
volume controls on minimum and the amplifier  
gain/input control(s) down. Wait 8 to 10 seconds  
before turning up the volume. This prevents  
transients which may cause severe speaker  
damage.  
environment) consult a professional  
technician.  
• Never attempt to make any adjustments or repairs  
other than those described in this manual. Take  
the DM1200 to your dealer or to an authorized  
Numark Service Center.  
• Use restraint when operating controls. Try to  
move them slowly. Rapid adjustments could  
damage speakers due to amplifier clipping.  
Avoid amplifier “clipping” at all costs: this  
occurs when the Red LEDs (usually on the front  
panel of most professional power amplifiers)  
start flashing. “Clipping” is when the power  
amplifier is distorting and working beyond its  
limits. Amplifier distortion is THE major cause of  
speaker failure.  
A NOTE ON CABLES:  
Make the input and output connections with  
readily available low-capacitance stereo cables.  
Quality cables make a big difference in audio  
fidelity and punch. See your Numark dealer or an  
electronics or audio specialist store if you are not  
sure which cables to purchase.  
• To prevent fire or shock hazard, do not expose  
the unit to rain or moisture. Never place cans  
of beer, soda, glasses of water or anything  
wet on top of the mixer!  
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DM1 2 0 0 / DM1 2 3 5 / DM1 2 8 5  
DM1 2 0 0 FRONT PANEL DIAGRAM...  
1 6  
1 9  
7
2 0  
1 5  
1 7  
1 1  
1
1 3  
1 0  
9
1 2  
1 4  
2
4
8
3
5
6
1 7  
DM1 2 3 5 / DM1 2 8 5 FRONT PANEL DIAGRAM...  
1 6  
1 9  
1 7  
7
2 0  
1 5  
1 1  
1
1 3  
1 2  
1 0  
BEATKEEPER  
o r  
9
2
4
SAMPLER  
8
3
5
6
1 7  
1 4  
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DM1 2 0 0 / DM1 2 3 5 / DM1 2 8 5  
GUIDED TOUR OF FEATURES AND OPERATING INSTRUCTIONS...  
INSTALLATION AND OPERATION  
CROSSFADER SECTION  
Study the Connections Diagram on page  
14. First, connect all stereo input sources. Next  
connect your microphone(s) and monitor  
headphones. Make sure all faders are at "zero" and  
the unit is off. Finally, connect the stereo outputs  
to the power amplifier(s) and/or audio sources.  
Plug your mixer into AC power. Now you are ready  
to switch it on.  
5. The Crossfader Assign knob to the left of the  
crossfader lets you choose which input channel will be  
heard when the crossfader is in the far left position.  
The Crossfader Assign knob to the right of the  
crossfader lets you choose which input channel will be  
heard when the crossfader is in the far right position.  
6. The Replaceable Crossfader achieves clean  
segues between the two selected input channels.  
We have divided this manual into various  
functional blocks:  
Off1 2 3 4  
Off1 2 3 4  
Input, Crossfader, DJ Mic, Master/Zone Output,  
Equalizer, and the onboard options of Beatkeeper  
or Sampler. It is important to learn how each of  
these work.  
"Hard left" selects the channel set up of the Assign  
Left knob. In this example, it is Channel 1. "Hard right"  
selects the channel set up on the Assign Right knob.  
In this example, it is Channel 4. With the crossfader  
centered, both assigned channels are live. Use the  
crossfader for fast and seamless segues from one  
selected channel to the other. To turn off the crossfader  
simply turn both knobs all the way to the left.  
CHANNEL INPUTS/CONTROLS SECTION  
1. Channels 1, 2, 3 & 4 Input Toggle  
Switches select which source will be live to that  
channel based on what you have connected to the  
rear panel input section.  
2. The Input Faders are low-noise, low-impedance,  
high-quality, smooth Alps™ faders. These control  
individual source levels in the mix.  
NOTE: The crossfader is user replaceable in case of  
failure. Simply unscrew the two large screws which hold  
it in place, lift it out and disconnect its cable. Re-attach  
the new crossfader and screw the mounting plate back  
onto the unit - you’re back in business!  
3. Channel Cue Assign. The Cue pushbuttons  
are used to route channel audio to the Monitor  
Section. The channel faders do not control the  
Cue send volume.  
4. Effect Send (Channels 1-4). Depress these  
buttons when you want the signal from any input  
channel to be routed to the Send Out Jacks. On  
the DM1285 this button sends signal to the  
onboard sampler.  
The channel faders do not affect the signal levels  
which are routed to the send output.  
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DM1 2 0 0 / DM1 2 3 5 / DM1 2 8 5  
DJ MIC SECTION  
MASTER/BOOTH OUTPUT SECTION  
Your mixer has an extremely flexible DJ Mic channel.  
The Talkover function reduces the level of the music  
while leaving the DJ Mic at normal volume.  
12. The Stereo Master Fader controls the overall  
output level.  
13. Stereo/Mono toggle adjusts the Master output  
7. Neutrik™ “Combo” connector allows connection of  
either a 1/4” jack or an XLR jack. This is ideal for  
for the operation selected.  
connecting an XLR gooseneck directly into the mixer.  
14. The Zone Level controls speaker volume for a  
remote zone or booth monitors. If you do not use  
booth monitors the output can feed a tape deck,  
another amplifier, another mixer or a satellite speaker  
system.  
8. Treble and Bass Controls fine-tune the tone of your  
voice on both mics through the sound system. The  
controls are detented for setting tone "flat". For best  
results, use a dynamic cardioid microphone.  
NOTE: The Zone control on the DM1235 and  
DM1285 is located to the right of the crossfader  
section.  
9. The DJ Mic 1 Fader controls the DJ Mic volume for  
the Neutrik™ “Combo” connector.  
10.The Mic 2 Fader controls the Mic volume for the  
NOTE: This can also be used to supply line level  
audio to a lighting controller or to lights that are  
sound activated.  
1/4” connector on the rear of the mixer.  
11.Mic Off/On/Talkover Switch. Off/On turns Mic 1  
off and on. Mic 2 is controlled only through the Mic 2  
Fader. Talkover turns down the input level of your  
music sources from Channels 1-4. Talkover is very  
useful for making announcements without adjusting any  
levels.  
CONTRACTOR NOTE: Booth Level provides  
zone control in installations where there are two  
separate rooms. For example,a bar and dance floor.  
Remote zone volume should be controlled from the  
mixer.  
Try using this feature for audience participation  
when you want the music to temporarily cease  
and the audience to be heard - “YEAH!”  
15. Stereo Auto Peak Hold Level Indicator. This  
fast, accurate stereo meter tracks the output level.  
The Red LEDs for +3dB, +5dB and +8dB hold  
program peaks for a second or two. With peak  
metering, it's OK to be "in the Red" as long as +5dB  
or +8dB aren't constantly lit. Set the crossover,  
equalizer and power amp inputs to avoid distortion at  
each step in the audio chain. Proper attention to the  
peak meter results in the punchiest possible sound  
without audible distortion.  
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DM1 2 0 0 / DM1 2 3 5 / DM1 2 8 5  
EQUALIZER SECTION  
16. 6-Band Stereo Graphic Equalizer (EQ). EQ  
compensates for differences in source material sound  
quality. In ultra-compact mobile systems this EQ can  
be used to tailor the sound to the acoustical  
requirements of the room. Center frequencies are  
42Hz, 152Hz, 480Hz, 1.5kHz, 4.8kHz and 15.4kHz.  
Faders have a center detent for an accurate "flat”  
response.  
GENERAL EQ HINTS  
• Boost the 42Hz band for deep bass tones and  
solid kick drum sound. Use sparingly because this  
dramatically increases demand on power amplifiers  
and could drive them into “clipping” (see page 5).  
• Cut slightly at 152Hz and more at 460Hz for extra  
clarity. Note: Cutting is preferable to boosting.  
• Boost 15kHz for a little "sizzle".  
Below is a typical "house" EQ curve. Notice how the  
knobs above "0" balance out the knobs below. Start  
with this setting if you've never used a graphic EQ  
before:  
• As a general rule, less equalization is better!  
17. Equalizer On/Off. This controls whether your  
final output will be routed through the EQ or not.  
0
MONITOR SECTION  
18. The Monitor section includes the Program Mix  
control, the Headphone Volume control and  
the Headphone Jack. Connect headphones  
with a standard 1/4" stereo plug. The Cue audio is  
sent to the headphone amp using the Cue  
Assign Pushbutton and the Pgm Mix control.  
The Program Mix controls the amount of program  
audio in the headphones so that beats can be  
matched exactly and segues are smooth when a  
song is cued.  
Below is an example of a poor EQ curve because it  
cuts the output volume down by 6-10dB. You have to  
compensate by running the Master output higher:  
0
Below is the worst sort of curve to use because you  
are using EQ to add volume. With exaggerated boost  
you can easily run your power amplifiers into  
19. 12V BNC Connector allows a 12 volt gooseneck  
lamp to be connected directly to the mixer. This  
light is readily available from your Numark dealer.  
“clipping” (see page 6) and damage your speakers:  
20. Power Switch and Power-On LED.  
0
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DM1 2 0 0 / DM1 2 3 5 / DM1 2 8 5  
DM1235 with theBEATKEEPER  
H
I
F
G
E
E. BPM DISPLAY-  
(--)- No audio signal is being processed for this input, or the  
Beatkeeper has not completed tracking the BPM for this  
input.  
(NUMBER)- The respective input is currently playing music  
with this number of Beats Per Minute (as determined by the  
Beatkeeper).  
A
C
B
D
F. DOWN BEAT LED (Red)  
OFF- The Beatkeeper has not yet matched the beat of the  
respective audio input.  
BLINKING- The Beatkeeper has matched this LED to the  
beat of the respective audio input.  
ON- The Beatkeeper is waiting for the music to start on the  
respective input.  
G. PEAK SOUND LED (Green)  
OFF-The Beatkeeper is not detecting sound from the  
respective audio input.  
BLINKING- The Beatkeeper is detecting 'rhythm setting'  
sounds from the respective audio input.  
A. CHANNEL SELECT-  
Tap this button to select desiRed pre-fader input channel.  
The respective input channel LED will light up 1,2,3,or 4.  
B. SYNC LOCK BUTTON-  
When an input is not yet set and scanning for the tempo,  
tapping the Sync Lock button once will lock in the music as  
long as there is a BPM number displayed for the input. When  
an input is locked in, tapping the Sync Lock button tells the  
Beatkeeper to start scanning for a new tempo again.  
H. TEMPO DIFFERENCE GRAPH  
OFF- One or Both of the audio inputs are not yet sync-  
locked in.  
RED LED ON- The audio inputs tempos are not aligned.  
YELLOW LED ON- The audio inputs tempos are close to  
aligned.  
C. SYNC LOCK LED  
OFF- The respective input is not locked or set to track the  
music.  
GREEN LED ON- The audio inputs tempos are perfectly  
aligned.  
ON- The respective input is synced and ready to track the  
music.  
I. BEAT OFFSET GRAPH  
OFF- One or both of the audio inputs are not yet sync-  
locked or are not sending an audio signal.  
RED LED ON- The audio inputs beats are not aligned.  
YELLOW LED ON- The audio inputs beats are close to  
aligned.  
D. BEAT ASSIST BUTTON-  
Tapping the Beat Assist button once automatically realigns  
the downbeat to exactly when you tapped the button.  
Tapping the beat assist button two or more times also sets  
the tempo and sync locks the music.  
GREEN LED ON- The audio inputs beats are perfectly  
aligned.  
Beat mixing is a skill that must be practiced in order to be proficient at it.  
3 and 4-way mixing can be a very difficult skill to master.  
Visual mixing with the Beatkeeper gives you the tools to help you do this,  
but nothing replaces practice.  
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Channel Selection  
Beat Assist  
When your mixer is first turned on, the channels  
selected will be 1 & 2 respectively. If you wish to track  
the beat of another channel, tap on the channel select  
button until the desired input is reached.  
NOTE: The Beatkeeper will track the source that is  
selected with the channel toggle switch.  
The Beatkeeper is foolproof. The Beatkeeper can  
track any music up to 199 beats per minute. The unit,  
however, is set to automatically track tempos between  
80-150BPM. Of course, not all music is within this  
range, you may need to track the high tempos of  
Meringue or Salsa, or the low tempos of R&B slow jams  
or Reggae. Let's face it, not all music has hard, steady  
beats either, and sometimes you just need the music  
set up yesterday . For these occasions, we have the  
Beat Assist Button.  
Syncing Your Beatkeeper  
When learning how to use the Beatkeeper, choose  
some dance music with a hard, steady beat.  
Start the music for left channel of your  
Beatkeeper. When the Beatkeeper has located the  
beat, the BPM display will illuminate with the music's  
Beats Per Minute.  
If the Beatkeeper is having trouble  
matching the beat to the flashing Red Beat  
LED, or if you need to sync up immediately,  
tap the Beat Assist button 2-8 times as you  
hear the beat, the same way you would tap  
your feet to the music. Pressing the Beat Assist  
Button more than once aligns the Beatkeeper to your  
taps. Notice that the Sync Lock LED automatically  
illuminates, signifying that the Beatkeeper is now locked  
in with the beat. Simply put, if the Beatkeeper isn't on  
track, or you're in a real hurry, you need to press a  
button twice instead of once.  
If the Beatkeeper is synced to the correct  
BPM, but is aligned to the music's offbeat, tap  
the Beat Assist button with the beat of the  
music just once, and you will have brought the  
Beatkeeper back in sync.  
You'll notice a flashing Green LED every time the  
Beatkeeper detects a rhythm defining instrument. The  
Beatkeeper will soon flash a Red LED on every beat, the  
same way you would tap your foot to the beat of the  
music. The Beatkeeper will display a BPM which will  
update every five seconds while scanning. As long as  
the beat is well-defined, the BPM number will equal the  
beats per minute of the song being played. Once you  
see the Red beat LED flashing with the beat of  
the music, press the respective Sync Lock  
button, and the Sync Lock LED will illuminate.  
Activating the Sync Lock tells the Beatkeeper to stop  
scanning the music for a different BPM and to start  
tracking the beat changes of the current BPM as you  
adjust the pitch of the music. This function is manual to  
ensure that the Beatkeeper is right on the beat. Once  
the Sync Lock LED is on, the Beatkeeper  
tracks the beats of the music and updates the  
BPM display on every beat.  
To unlock, simply tap the Sync Lock button once and  
the Beatkeeper is back in BPM scanning mode.  
After syncing an audio input, try speeding up and  
slowing down the music. You'll notice that the Red beat  
LED will continue to flash on the downbeat, and the BPM  
number will adjust itself to match the tempo of the music.  
This indicates that the Beatkeeper is successfully  
tracking the beat and will continue to do so throughout  
your mix. If you stop the music, you will notice the Beat  
LED will go solid and the BPM number will remain in  
memory. Once the music is restarted, the Beatkeeper  
will remember the last tracked rhythm pattern and pick up  
on the beat right away.  
Two Channel Mixing  
After you feel comfortable syncing up the  
Beatkeeper, you're ready to mix. Mixing with the  
Beatkeeper has three parts: syncing to the  
music (which you've done), aligning the tempos,  
and aligning the beats. Once these three things  
are done, you will have a perfect mix. No more guessing,  
tapping, or embarrassing fades.  
Choose another music selection, and start it on your  
right channel. Sync up the first song as described in  
the last section. With the first selection synced (Sync  
Lock LED illuminated), sync up the right channel  
the same way you set up the left.  
As the second Sync Lock LED illuminates, a  
new dimension of DJing begins:  
VISUAL MIXING.  
The bar graphs on the top of the  
Beatkeeper have now been activated and are  
updating automatically.  
NOTE: In order to perform a mix which is tracked by  
the Beatkeeper, both channels MUST be synced. This  
is indicated by the Yellow Sync Lock LED being lit for  
both inputs.  
PLAY the music, OBSERVE the beat match, and  
PRESS the Sync Lock Button. That's it. If you can  
do that twice, you can mix with the Beatkeeper.  
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In order to create the perfect mix, your goal  
is to keep both bar graphs as close to  
Channel Mixing  
One exciting feature of your Beatkeeper built into  
your mixer is the option to visually beat mix more than 2  
sources at the same time. Once you have synced a  
channel of the Beatkeeper, the unit will continue to track  
it even if you should decide to change channels. Up to  
all four channels can be in sync simultaneously. By  
selecting different channels, you can cross-compare the  
mix of any 2 channels instantly.  
centered (Greenor Yellow) as possible.  
First, align the top graph, the Tempo Difference Graph.  
This graph indicates how close the two BPMs are to each  
other. If they are exactly the same tempo, the GreenLED  
in the middle will light up. If one song is faster than the  
other, the bar graph will shift towards the faster song. If  
the Tempo Difference graph is not centered,  
adjust the speed of one of the inputs using  
the pitch control. For example, if the Tempo  
Difference graph has a Red LED illuminated closer to the  
right channel of the Beatkeeper, the right channel is  
faster than the left channel, either slow down the right  
channel, or speed up the left channel.  
If the opposite is true, the Tempo Difference Graph has  
a Red LED illuminated on the left channel, indicating the  
song on the left channel is faster than the right channel,  
either slow down the left channel, or speed up the right  
channel.The second step involves the bottom graph,  
the Beat Offset Graph. This graph indicates how close  
the individual beats are. Both BPMs may be the same but  
the beats may not be in sync. This is often described as  
the “ping-pong” effect. If the beats are matched, the  
GreenLED in the middle lights up. If the beats of one  
input are earlier than beats of the other input, the Beat  
Offset Graph will shift toward the song with the earlier  
beats.  
In order to perform a 3-way mix, you first will  
need to set up a 2-way mix as described in the  
previous section.  
NOTE: Multiple source or “layer” mixes should be  
performed with a minimum of vocals otherwise the music  
will clash when mixed for a long period of time.  
The next step will be to decide which input channel  
you would like to use as a reference for beat mixing.  
While your 2-way mix is ongoing, change the  
channel, on the side you have not chosen as a  
reference to the next song you plan to mix into. Now  
sync and mix this song like you did for the 2-  
way mix. After you have synced up the new song you  
should continue to check your original mix by switching  
between channels. When you have properly aligned  
the new song, you are ready to perform a 3-way mix.  
To perform a 4-way mix, just do the same thing again.  
Prepping For A Mix  
To align the Beat Offset Graph when using  
CD Players, adjust the appropriate pitch bend.  
If you are using turntables, hold or apply  
pressure to the record/turntable and then  
release to “shift” the beat.  
If the Beat Offset graph is shifted toward the right  
channel, either use the minus (“-”) pitch bend for the  
right channel CD player (with vinyl, apply pressure to slow  
the turntable) or use the plus (“+”) pitch bend for the left  
channel CD player (with vinyl push the turntable ahead).  
Intuitively, if either bar graph is shifted towards a  
channel, this indicates that the song on that channel is  
“ahead” of the other one. Either the tempo is faster (top  
graph), or the beats come sooner (bottom graph).  
When both bar graphs are in the Green, you  
are ready to perform your mix!  
You may also choose to prep the Beatkeeper for an  
actual mix. To prep the Beatkeeper, first match the two  
song's tempos by adjusting the pitch so that the Tempo  
Difference LED graph displays Yellow or GreenLEDs.  
Next, hit the Cue button of your CD player, or lift your  
record needle. The Red “beat” LED will remain solid  
alerting you to which input is ready to start. When the  
music starts again, the Beatkeeper begins right on the  
beat and indicates how well the two songs are synced  
within seconds.  
Syncing To Off Beats  
Now if you really want to be fancy, you can actually use  
the Beatkeeper to sync to the off- beats. You can have  
two songs going “Boom - Cha - Boom - Cha”. Normally,  
you would sync the “Booms” of both songs (beat-to-  
beat mixing). But you can also sync the “Boom” of one  
song to the “Cha” of the other (beat-to-half beat mixing).  
The Beatkeeper’s Beat Offset graph will display  
whichever offset is smaller. This allows the DJ the  
flexibility to mix with the beat or the off-beat.  
Don’t forget you can always resync to the beat, if it ever  
shifts off, by tapping the Beat Assist button.  
If the beats start to drift, you'll be able to easily adjust  
the music before your audience can hear it. No other  
beat counter or automatic mixer can give you the power  
to make a more accurate mix!  
NOTE: The Beat Offset bar graph either indicates  
beat-to-beat offset, or beat-to-halfbeat offset, whichever  
is closer. This allows the DJ the option of mixing on the  
beat or on the half beat.  
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DM1 2 0 0 / DM1 2 3 5 / DM1 2 8 5  
BEATKEEPER TROUBLESHOOTING  
T1 The BPM goes way off when using the search  
T8 The beat tracking suddenly gets off track.  
This may happen if the music has several beats missing, or the  
rhythm suddenly becomes extremely complex or variable. You can  
either resync the beat using the Beat Assist button or wait a few  
seconds for the Beatkeeper to automatically recover.  
button on my high tech CD mixer.  
Some high tech CD mixers have a cueing feature which allows you to cue  
precisely to an exact spot in the music so you can slam mix. The only  
problem is that this mode repeats the first beat of the music at a rate which  
is unrelated to the actual BPM of the music. As a result, the BPM goes off  
track. The best way to avoid this is to restart the music after a search.  
Make sure the Beatkeeper is resynced to the music and then press the  
Cue button on the CD player. The Beatkeeper will remember the BPM and  
track the music once it starts.  
T9 The Beatkeeper seems to track the music for a  
short time right after using the Beat Assist  
and then drifts off.  
This could be one of two things:  
a) The Beatkeeper is averaging the time between each of your Beat  
Assist button taps. If the first tap is way off, the tempo will be way off.  
b) The Beatkeeper was synced during a section of the music without  
a well defined beat.  
In either case, the problem can be overcome by waiting a few  
seconds before preceding to tap the Beat Assist button two or more  
times with the beat of the music.  
T2 The Beatkeeper doesn't resync to the downbeat  
of the music when the music restarts.  
Either the downbeat isn't strong enough to be detected, or the music was  
started well before a strong downbeat. You can easily resync to the  
downbeat by tapping the Beat Assist button once with the beat.  
Alternatively you can cue the music to a strong downbeat so that the  
Beatkeeper starts on this downbeat.  
T10 Either the BPM number or Red beat LED  
doesn't track the music fast enough while  
using the pitch bend on my CD player (or  
T3 Either the BPM display is blank, or it is  
noticeably off.  
This is common at the beginnings of songs where the beat is not well  
defined. To sync simply tap the Beat Assist button two or more  
consecutive times on the downbeat. The Sync Lock LED turns on  
automatically, indicating that the Beatkeeper is now tracking the beat of the  
music.  
speed control on my record player).  
You may have exceeded the tracking capability of the Beatkeeper.  
The Beatkeeper can normally handle speed changes of +/- 5% per  
beat if the music's rhythm is steady. If the rhythm is complex (or  
some of the beats are missing) the Beatkeeper will require more  
gradual changes to track properly.  
T4 The BPM display is correct, but the beat LED isn't  
* If you are using a record player or a wide range pitch bend on a CD  
player, note that the Beatkeeper only tracks +/- 11.5% from the tempo  
at which it was synced. You may need to resync the Beatkeeper if you  
exceed this range while attempting to align tempos.  
flashing on the downbeats of the music.  
If this happens tap the Sync Lock button (turning the Sync Lock LED on)  
and tap the Beat Assist button once to make the Beatkeeper track the  
downbeat. You can also use this to force the Beatkeeper to track an offbeat  
for more advanced mixing.  
* You can also manually resync the beat using the Beat Assist button.  
Alternatively you may sync manually by tapping the Beat Assist button 2 or  
more times on the beat.  
T11 Neither the Tempo Difference graph or the  
Beat Offset graph seem to work.  
The bar graphs are only operational when both Sync Lock LEDs are  
illuminated. This ensures that you don't inadvertently try to mix two  
songs without their tempos being synced.  
T5 The Beats per minute number seems to jump all  
over the place.  
The Beatkeeper is analyzing different sections of the music to find the  
BPM. If there is a temporary suspension of a distinct beat or if the rhythm  
is too complex, this number may not follow the actual BPM.  
a) You can wait for a passage of music with a steady beat for a more  
accurate BPM indication.  
To make the bar graphs operational, either:  
a) Wait for the Red beat LED’s to follow the music and tap the  
respective Sync Lock button or  
b) Tap the Beat Assist button twice with the beat of the music.  
Either method will cause the Sync Lock LED to illuminate.  
b) Hit the Sync Lock button once the Red beat LED starts following the  
beat  
or c) Tap the Beat Assist button at least twice along with the music beat.  
Either method (b or c) will cause the Sync Lock LED to turn and lock on,  
indicating that the Beatkeeper is now tracking the music.  
T12 The Beat Offset graph is not illuminated, but  
the Tempo Difference graph is.  
This indicates that one or both of the inputs are not playing. The Beat  
Offset graph turns off when there are no beats available for tracking  
on either or both inputs. The graph automatically restarts once both  
inputs become active again.  
T6 It takes too long for the Beatkeeper to find the  
beat on its own.  
To speed up the BPM detection process, tap the Beat Assist button at least  
twice. At this point, the Beatkeeper will turn on the Sync Lock LED,  
immediately providing a BPM estimate, while resynchronizing to the beat  
you tapped.  
T13 The Beat Offset graph has the GreenLED  
illuminated when the Red beat LEDs are a half  
beat off from each other.  
This indicates that the songs are synced at their half beats. With rap  
music and some house, mixing is often done on the half beats rather  
than the down beats themselves. The Beatkeeper intentionally syncs  
this way to give the DJ the option of beat-to-beat mixing or beat-to-  
halfbeat mixing.  
T7 I hit the Sync Lock button, but the flashing Red  
beat LED doesn't seem to follow the beat.  
This means you hit the Sync Lock button before the Red beat LED actually  
started tracking the tempo. You can easily fix this by tapping the Beat  
Assist buttons as many times as necessary to resync to the beat of the  
music.  
Numark - The Le ade r in DJ Te chnology  
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DM1 2 0 0 / DM1 2 3 5 / DM1 2 8 5  
DM1285 with DIGITAL SAMPLER  
1
TO RECORD A SAMPLE  
2
a - Press the Write button once to go into stand by  
4
mode. The Red LED will go on.  
3
b - Select the bank (or multiple banks) into which you  
want to record. Any bank can be selected. Each bank  
contains 3 seconds of recording time. If you want to  
record a longer sample, select multiple banks (they  
must be adjoining). To playback a multi-bank sample  
you must reselect the same banks later. Note: To  
overwrite an existing sample, select that bank instead  
of an empty bank. Changing bank selection at this  
point in time is possible and will not destroy any  
previously recorded samples.  
5
6
7
8
e - Hit the Start-Stop button to begin recording. Its  
The DM1285 Sampler uses dynamic RAM with a  
16-bit microprocessor controller. The same digital  
signal processing components used in professional  
audio equipment deliver CD-quality samples.  
Red LED will light.  
f - Hit Start-Stop a second time to stop the sampling, or  
allow the memory banks to fill up, at which time  
sampling will stop automatically. Once your writing is  
complete, the sampler will automatically switch to  
Single playback mode and light the Single LED. The  
sampler is now ready for playback.  
1. The Mode Pushbuttons switch from effect to effect.  
The accompanying LEDs illuminate to show you which  
specific mode you are in at any time.  
Modes are:  
2. Intro and Outro editing controls are used when  
Edit mode is selected to fine-tune the beginning  
(Intro) or ending (Outro) of your samples. These  
"trim" the unwanted sound while in Single or  
Repeat playback modes. Turn the controls inward to  
trim more - return them to their full outside position to  
return to your full sample. Once trimmed, turn Edit off  
to lock-in your settings. Now every time you select the  
sample it will be the perfect length. Note: Trimmed  
samples are not erased - they can be heard again by  
going back into Edit and undoing the trim. This  
powerful new feature allows you to start a sample early  
or end it late and still trim it to the perfect length  
without having to re-record. Since these controls can  
be active while the sample is "live", you can even fine-  
tune samples on the fly. A way of efficiently trimming  
samples is by engaging the Stutter button and  
repeatedly hitting the Start-Stop button as you  
adjust the Intro knob.  
Repeat sets the unit to play back a sample and  
automatically repeat (loop) when it gets to the end of  
the sample.  
Single sets the unit to play back a sample once.  
Edit sets the unit to sample edit. This activates the  
Intro and Outro editing controls as described in #2.  
Edit can be used at the same time as Single and  
Repeat so that editing of the sample can be done  
while your program output is playing on the dance floor.  
Write sets the unit to sampler record ready. After  
selecting a bank, hit the Start/Stop button (#6) to  
begin recording (it is safer to actually choose your bank  
before going to write mode so that you don't  
accidentally wipe out an existing sample). The LED will  
stay lit while you are in Write mode. After you are done  
writing your sample, you should select a play mode  
(either Single or Loop) and listen to your sample - note  
that you must do this manually by hitting the correct  
Mode Pushbutton.  
Numark - The Le ade r in DJ Te chnology  
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DM1 2 0 0 / DM1 2 3 5 / DM1 2 8 5  
3. The Speed Control plays samples faster or slower  
resulting in a pitch shift of the sample. In the center  
position, the sample is played at recorded speed.  
Moving the knob to the left will slow down playback by  
up to 50%; moving the knob to the right will speed up  
the playback by up to 200%. Positions near the center  
provide fine changes in playback speed. Positions  
further from the center detent provide more drastic  
changes in playback speed.  
• In Single or Repeat play with Trigger you are ready  
to "stab" samples. With the Trigger Out, the sample  
plays all the way through before you can play it again.  
With it In, you can stab or stutter a sample. When you  
shout "Rock it - rock the house!" and sample it, it can  
be played back as -  
R-R-R-R-R-R-R-Rock --  
Rock-Rock-Rock it - Rock it Rock it -  
Rock - - Rock it - rock the house!  
4. Effect Level Mix fader. This precisely sets the  
audible level of the sample in the mix.  
by simply "drumming" with your fingers.  
5. Memory Bank Select Pushbuttons A-D.  
Four banks are available for storing samples. To record  
a bank go to Write and then hit the bank button. You  
can record into any combination of banks by pressing  
multiple bank buttons.  
7. The Stutter Pushbutton lets you choose  
between two playback styles, Trigger and Non-  
Trigger, when in Single or Repeat modes.  
• When the Stutter is Out and the sampler is set to  
Single or Repeat mode, each time you tap the  
Start-Stop button the sample starts to play. The  
next tap stops sample playback. The next time play  
starts, the sample re-starts at the beginning.  
After sampling, you can either select the next bank and  
record it (remember Write is still on, just select the  
bank and hit Start/Stop), or you can manually select a  
playback mode.  
• When the Stutter is In and the sampler is set to Single  
or Repeat mode, each time you tap the Start-Stop  
button the sample re-triggers.  
You can play any combination of the Memory Banks  
from left to right (that is, Memory Bank B will always play  
before Memory Bank D - but you can play ABCD; BC;  
BD: ACD; only C; only D; etc.).  
ABOUT STUTTERING  
6. The large Start-Stop button controls sample  
recording and sample playback. The small Red Effects  
Indicator LED glows when the sampler is "on". Here are  
the functions:  
Expensive studio rack-mount samplers and sampling  
keyboards can re-trigger or stutter. This means  
"beginning at the start of the sample each time a key is  
pressed or a drum pad is struck".  
• Tap the button when in sampler Write mode to begin  
sampling (the LED will light). Tapping it again ends the  
sample and the LED goes out (unless the sampler has  
run out of memory and shuts off automatically). Once  
the Effects Indicator LED goes out, the Write LED  
goes out and the Single LED turns on.  
Re-triggering creates the stuttering "rap" effect. The  
DM1285 includes a manual stuttering feature. How  
fast can you tap? Try using two fingers for increased  
speed.  
8. Monitor Pushbutton. To hear the sample or effect  
in the headphones, press this button. Program Mix  
still works, and you will be able to hear any other input  
channels with the Cue buttons activated.  
In single or repeat play without Trigger, tap the button  
to play the sample and tap it again to stop the playback.  
Every time you play the sample, the music starts from  
the beginning of the sample.  
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© 1 9 9 8  
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DM1 2 0 0 / DM1 2 3 5 / DM1 2 8 5  
DM1 2 0 0 / DM1 2 3 5 / DM1 2 8 5 REAR PANEL DIAGRAM ...  
1 1  
8
8
8
1
1 0  
2
7 7  
7
7
7
4
5
3
9
9
9
6
REAR PANEL: INPUTS AND OUTPUTS  
1. Power Connector. Plug in power cord here and check the voltage level to match your country’s standard.  
2. GND is the grounding lug for turntables 1, 2 and 3 (phono inputs on Channels 1, 2 and 3). Always use this  
connection (your turntable cable should have a grounding wire).  
3. The Stereo Main Outputs are low-impedance RCA connectors controlled by the Master fader.  
4. The Stereo Zone Outputs are low-impedance unbalanced RCA jacks controlled by the Zone Level control.  
5. The Tape Outputs are low-impedance unbalanced RCA jacks which output the program mix and allow you to  
connect any recording device.  
6. The Send can be attached to an external effects processor such as a sampler.  
7. Channels 1-5 Line Inputs are unbalanced RCA jacks. The Line Input is selected with the toggle switch on the  
front panel. You can connect stereo audio from HiFi VCRs, cassette and reel-to-reel tape decks, DAT machines, CD  
players, laser discs, tuners, even synthesizers or other mixing consoles.  
NOTE:Plug mono audio sources into both Left and Right inputs using a “Y” cable connector.  
8. Line/Phono Input switch. Use this to allow line level equipment to be plugged into your phono inputs giving  
you a total of 8 line input options.  
9. Phono Inputs on Channels 1, 2 and 3 use unbalanced RCA jacks. Your input signal is fed directly to the  
DM1200's high-quality RIAA phono pre-amplifiers so use this position only for moving magnet cartridges. Line level  
sources will overload the sensitive phono pre-amps and will sound very bad, so always be sure to toggle the  
line/phono switch over to line before connection of line sources.  
10. The Balanced Main Outputs are low-impedance XLR type connectors controlled by the Master fader.  
11. Mic 2 is the mic input for Channel 4.  
Numark - The Le ade r in DJ Te chnology  
© 1 9 9 8  
Industries  
1 6  
 
DM1 2 0 0 / DM1 2 3 5 / DM1 2 8 5  
CONNECTION DIAGRAM...  
Main Balance d  
Sound Syst e m  
w/ Am p lifie r  
Microphone 2  
Keyboard  
Turnt able 1  
Dig it a l Sa m p le r  
Tape Deck  
AC  
Out le t  
Zone  
Tape Deck  
Sound Syst e m  
w/ Am p lifie r  
CD Pla ye r  
Turnt able 2  
Turnt able 3  
Ma in  
Unbalance d  
Sound Syst e m  
w/ Am p lifie r  
Numark - The Le ade r in DJ Te chnology  
1 7  
© 1 9 9 8  
Industries  
 
DM1 2 0 0 / DM1 2 3 5 / DM1 2 8 5  
SPECIFICATIONS...  
INPUTS:  
DIMENSIONS: 482mmx232mmx111mm  
19” x9 1/8” x4 3/8”  
Line:10kW input impedance  
80 mV rms sensitivity (for 1.22 V output)  
WEIGHT:  
DM1200  
4.3kgs 9.6lbs  
DM1235/DM1285 5.1kgs 11.2lbs  
Mic: 10kW input impedance balanced/unbalanced  
2.5 mV rms sensitivity (for 1.22 V output)  
500 mV rms max input  
Phono: 47kW input impedance  
DM1235 with BEATKEEPER  
Sync Lock Mode  
BPM update rate  
1.5 mV rms sensitivity @ 1 KHz (for 1.22 V output)  
Every beat  
+/- 1 BPM  
50-199BPM  
OUTPUTS:  
BPM accuracy  
BPM tracking range  
Bar graph update rate  
Tempo difference graph resolution  
+/-1 BPM per LED, Green is +/-2 BPM  
Beat offset graph resolution  
Line:  
9V rms max (+20 dBm)  
470W balanced. 3.5Vrms  
100W balanced 1.12Vrms  
Every beat  
Headphone Amp: .5 watt into 47W  
Distortion less than .01%  
+/-7.5msec per LED, Green is +/-15msec  
EQUALIZER:  
6-Band Stereo Graphic EQ  
Band centers 42 Hz, 152 Hz, 480Hz, 1.52KHz, 4.8KHz,  
15.36KHz +/- 15 dB  
Beat Assist Button  
Minimum time between consecutive taps  
0.3 seconds  
Maximum time between consecutive taps  
1.2 seconds  
Consecutive taps averaging for BPM  
Last 2 to 8 taps  
SIGNAL TO NOISE RATIOS (vs. maximum  
output):  
Line:  
Better than 85 dB  
Better than 72 dB  
Better than 83 dB  
Mic:  
Phono:  
FREQUENCY RESPONSE:  
DM1285 with SAMPLER:  
Mic:  
Line:  
20 Hz- 15k Hz _+ .5 dB  
20 Hz- 20k Hz _+ .5 dB  
FREQUENCY RESPONSE AND SAMPLING RATE:  
Variable sampling rate 44.1 kHz with 16-bit sampling  
yields 20Hz-22 kHz.  
Phono:  
+_ 1 dB except for controlled attenuation  
of -3 dB  
@ 20 Hz to Reduce rumble and feedback  
MAXIMUM MEMORY TIME:  
12 seconds  
TALKOVER ATTENUATION:  
variable from no cut to -16 dB  
POWER CONSUMPTION:  
20 Watt typical, 28 watt with full headphone output  
Numark - The Le ade r in DJ Te chnology  
© 1 9 9 8  
Industries  
 
DM1 2 0 0 / DM1 2 3 5 / DM1 2 8 5  
BLOCK DIAGRAM...  
Numark - The Le ade r in DJ Te chnology  
© 1 9 9 8  
Industries  
 
Professional Disc Jockey Products  
Wa rra n t y a n d Se rvic e In fo rm a t io n  
Numark Industries, LLC and Numark International, Inc. (hereafter “Numark”)  
warrants each new product manufactured and/or supplied by it to be free from  
defects in material or workmanship under conditions of normal use and service for  
360 days, beginning on the date of purchase from an authorized Numark Dealer,  
but not to exceed 2 years from date of shipment by Numark.  
The Numark obligation under this warranty is limited to repairing or replacing, at  
its option, the product or part(s) therein; which upon examination by Numark shall  
appear to be defective or not up to factory specifications; providing the Numark  
product is returned (transportation prepaid) to Numark.  
Numark shall not be liable for any damages, consequential or otherwise,  
resulting from the use and operation of this product and makes no other warranty(s)  
either express or implied on this product, including any warranty of merchantability.  
This warranty does not extend to any of our products which have been  
subjected to misuse, neglect, accident, incorrect wiring not our own, improper  
installation, or use in violation of instructions furnished by us, nor extended to units  
which have been repaired or altered outside of our factory, nor to cases where the  
serial number thereof has been removed, defaced, or changed, nor to accessories  
used therewith not of our own manufacture. Numark reserves the right to make  
changes or improvements in its products, during subsequent production, without  
incurring the obligation to install such changes or improvements on previously  
manufactured equipment.  
To place this warranty into effect, the enclosed WARRANTY REGISTRATION  
CARD must be returned to Numark Industries, LLC within thirty (30) days after  
date of purchase.  
This warranty gives you specific legal rights, and you may also have other  
rights which vary from state to state.  
Some states do not allow the exclusion or limitation of incidental or  
consequential damages so the above limitation or exclusion may not apply to you.  
EQUIPMENT TRANSPORT  
A Return Authorization number should be obtained from Numark through the  
addresses or phone numbers below.  
It is the customer’s obligation, when returning faulty equipment, to properly  
pack the Numark equipment in its original packaging. Failure to do so may  
inadequately protect the equipment in transit and, therefore, jeopardize the  
customer’s warranty. The defective Numark equipment should be sent, FREIGHT  
PREPAID with Return Authorization number to:  
INDUSTRIES  
11 Helmsman Avenue  
North Kingstown, RI 02852. U.S.A.  
Attention: Service Department  
Telephone:  
Fax:  
+1 (401) 295-9000  
+1 (401) 295-5200  
 

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