Bogen Stereo Amplifier C100 User Manual

Classic Series Amplifiers  
C35, C60, & C100 Models  
Installation and Use Manual  
© 2003 Bogen Communications, Inc.  
All rights reserved.  
Specifications subject to change without notice.  
54-5979-02B 0307 Printed in Korea.  
 
Contents  
Page  
PANEL DESCRIPTIONS..................................................................................................2-3  
Classic Series Front Panel..................................................................................................................2  
Classic Series Rear Panel ..................................................................................................................3  
INSTALLATION ..................................................................................................................4  
Package Contents................................................................................................................................4  
Ventilation..............................................................................................................................................4  
Rack Mounting......................................................................................................................................4  
CONNECTIONS..................................................................................................................5  
Input Connections ..............................................................................................................................5  
Microphone Connections ..............................................................................................................5  
Auxiliary ..........................................................................................................................................5  
AUX Muting....................................................................................................................................5  
TEL ..................................................................................................................................................5  
Output Connections ..........................................................................................................................5  
Speakers, General ..........................................................................................................................5  
Speakers, Low-Impedance ............................................................................................................5  
Tape/Booster Connection ..............................................................................................................5  
WMT1A Connection......................................................................................................................5  
OPERATION ....................................................................................................................6-7  
Front Panel Controls..........................................................................................................................6  
Power ..............................................................................................................................................6  
InputVolume Controls....................................................................................................................6  
MIC2,AUX1 Mode Switch............................................................................................................6  
Base andTreble Controls ..............................................................................................................6  
Rear Panel Controls............................................................................................................................7  
TELVolume Control........................................................................................................................7  
VOX SENSitivity Control................................................................................................................7  
SPECIFICATIONS ..............................................................................................................8  
TROUBLESHOOTING........................................................................................................9  
WARRANTY ......................................................................................................................10  
ACCESSORIES ..................................................................................................................10  
 
Panel Descriptions  
Classic Series Front Panel  
1. MIC1 Level Control  
Individual level control for a dedicated microphone input.  
2. MIC2/AUX1 Mode Switch  
Switch selects either the MIC2 or AUX1 connection as the active input.  
3. MIC2/AUX1 Level Control  
Individual level control for a dedicated microphone input or for an auxiliary input depending on input mode  
selected.  
4.AUX2 Level Control  
Individual level control for a dedicated auxiliary input.  
5.Treble Control  
Controls the amount of cut or boost of treble frequencies above 10 kHz.  
6. Bass Control  
Controls the amount of cut or boost of bass frequencies below 100 Hz.  
7. Power  
AC Power switch. Illuminates when ON.  
2
 
Panel Descriptions  
Classic Series Rear Panel  
1.Amplifier Output  
Screw terminal strip containing all available speaker outputs.  
2.Tape/Booster  
RCA unbalanced signal level/output.  
3.WMT1A  
RCA output connection for Bogen’s 600-ohm balanced line matching transformer Model WMT1A.  
4.AUXTerminal  
Screw terminal connection that allows externally controlled muting of AUX inputs with a contact closure.  
5. Microphone Inputs  
Screw terminal strip containing the MIC1 and MIC2 balanced, low-impedance inputs.  
(MIC2 is switch-selectable.)  
6.Auxiliary Inputs  
RCA unbalanced,AUX1 and AUX2 high-impedance inputs. (AUX1 is switch-selectable.)  
7.TEL Input  
Screw terminal input for 600-ohm balanced telephone signal.  
8.VOX SENS Control  
Variable control for adjusting TEL input signal level trigger point for automatic muting of Aux input.  
9.TELVolume Control  
Adjusts the telephone input paging level.  
3
 
Installation  
Package Contents  
• Classic Series Amplifier  
• Instruction Manual  
Ventilation  
When using a shelf or table mount, the amplifier should stand alone with no equipment on top of it or below  
it. If the amplifier must be stacked with other equipment, care must be taken to ensure that all the minimum  
1
clearance distances ( /2") are met and that the equipment below the amplifier produces little significant heat.  
Rack Mounting  
A rack mount bracket kit (Model RPK50) is available as an accessory. (Not included.)  
4
 
Connections  
Input Connections  
Microphone Connections  
These inputs are for two low-impedance balanced dynamic microphones.  
Connect cable shield to center screw marked "GND."  
Auxiliary  
AUX2  
AUX1  
The AUX inputs provide unbalanced RCA inputs for connection to  
external signal-level equipment.  
AUX Muting  
For this function, a customer-supplied, normally-open contact closure  
(switch) must be connected to the AUX 2 MUTE terminals. When the  
contacts are closed, the AUX 2 input will be muted.Typically activated by  
a switch in a push-to-talk style microphone. AUX 1, if selected, is not  
mutable by contact closure.  
TEL  
Connect the telephone line to the two outside terminals and the shield,  
if used, to the center terminal. TEL input signal will trigger automatic  
muting of AUX 1 and AUX 2. Input impedance is 600-ohm and is trans-  
former balanced. Input is for "Dry" audio signals only, no DC voltage on  
the signal.  
Output Connections  
Speakers, General  
The amplifier may be used with most conventional speaker sys-  
tems. Connect one speaker lead to the screw terminal that cor-  
responds to the impedance of the type of speakers used in the  
system and the other lead to the COM terminal. If the line is  
shielded, connect the shield to GND.  
Connecting the GND to the COM terminal when using the trans-  
former-coupled outputs references the transformer output to  
ground. Disconnecting the GND terminal from COM allows the  
transformer output to float electrically. This is sometimes useful  
under certain conditions where a ground connection is undesir-  
able. It is generally a good idea to short the GND to the COM  
terminal regardless of output type (Trans or Direct).  
Speakers, Low-Impedance  
To connect a 4-ohm speaker, remove the the 4-ohm link and  
connect the speaker between 4-ohm and GND.  
Tape/Booster Connection  
To tape record the amplifier program, connect a patch cord from the  
TAPE/BOOSTER output jack to the input of a tape recorder. Can also be  
connected to the input of a booster amplifier.  
WMT1A Connection  
This output jack is directly connected to the 25V speaker tap and permits  
the connection of Bogen’s general-purpose matching transformer  
(WMT1A).The WMT1A steps the signal down by a 5:1 ratio, giving you  
a 600-ohm balanced signal that can drive long cable runs.  
5
 
Operation  
Front Panel Controls  
Power  
The front panel ON/OFF switch applies power to the amplifier and is illumi-  
nated when power is ON.  
InputVolume Controls  
Each input module may be individually controlled by its corresponding volume  
control knob.  
MIC2,AUX 1 Mode Switch  
Activates the corresponding input that it is switched to - MIC2 or AUX1.The  
other input is inactive and any connections to the inactive input will not work.  
Bass andTreble Controls  
The Bass andTreble controls are used to adjust the tonal balance of the ampli-  
fier output. The center position of these controls provides flat frequency  
response. Counterclockwise rotation of these controls reduces the bass or  
treble response, while clockwise rotation increases such response.  
The treble control has a cut/boost range of +/- 11 dB at frequencies above  
10 kHz and provides a roll off after 20 kHz to reduce gain above the audio  
range.  
The bass control has a cut/boost range of +/- 11 dB at frequencies below 100  
Hz. When driving speakers using the direct-coupled output terminals,the bass  
filter’s response is flat to 20 Hz.  
6
 
Operation  
Rear Panel Controls  
TELVolume Control  
The TEL VOLUME control on the rear panel adjusts the TEL input’s paging  
level. It does not affect the microphone level. Rotate the control counter-  
clockwise to decrease the level. Rotate the control clockwise to increase the  
level.  
VOX SENSitivity Control  
When an input signal (such as voice) is detected through the TEL input, the  
music channels (AUX1 and AUX2) will be muted.The VOX SENSitivity con-  
trol should be set so that only the desired signal is above the threshold level,  
while noise and unwanted signal is below it.To adjust the sensitivity of this cir-  
cuit:  
1. Rotate the control fully clockwise. While making a page announcement  
and talking at a low level, the sound should not be choppy nor missing  
parts of words. If it is choppy, or if intelligibility is poor, rotate the control  
counterclockwise to the point where the sound is clear and crisp (but  
not to the maximum counterclockwise position).  
2. If the background music shuts down when no page is in progress, rotate  
the control clockwise until the music is restored.  
7
 
Specifications  
Power Output (RMS)  
C35:  
C60:  
35W  
60W  
C100:  
100W  
Frequency Response  
& Distortion  
Transformer :  
70 - 16 kHz (± 2 dB) @ 1% max.  
20 - 20 kHz (± 1 dB) @ 0.5% max.  
4-Ohm Direct Output:  
Hum and Noise  
MIC Input:  
55 dB below rated output  
70 dB below rated output  
70 dB below rated output  
AUX Input:  
TEL Input:  
Tone Control Action  
Bass:  
Treble:  
+/- 11 dB @ 100 Hz  
+/- 11 dB @ 10 kHz  
Input Sensitivity  
MIC Lo-Z Balanced:  
600 µV  
85 mV  
75 mV  
AUX:  
TEL:  
Outputs  
8, 16 ohms, 25V, and 70V transformer-isolated balanced or unbalanced; 4 ohms  
direct unbalanced  
Output Connections:  
Speaker screw terminal strip,TAPE/BOOSTER jack;  
WMT1A jack  
Input Connections:  
Controls:  
(2) MIC Lo-Z terminals; (2) AUX Hi-Z jacks,Tel  
MIC1, MIC2/AUX1 (switch selected),AUX 2, BASS,TREBLE,TEL,VOX  
120V AC, 60 Hz  
Power Requirements:  
AC Line Draw  
C35:  
85W  
C60:  
148W  
220W  
C100:  
Dimensions:  
1
14 /2" W x 33/4" H x 11" D (all models)  
Product Weight  
C35:  
C60:  
C100:  
16 lb.  
18 lb.  
20 lb.  
Measured @ 2 dB below FRP  
All specifications subject to change without notice.  
8
 
Troubleshooting  
PROBLEM  
CONDITION  
CAUSE  
• Amplifier not plugged in.  
• AC outlet dead.  
• Power switch off.  
Power Switch Indicator is OFF.  
• Circuit breaker tripped.  
NO SOUND  
• No signal from source.  
Volume turned down.  
• Speakers not connected correctly.  
• Link jumper not set correctly (pg. 5).  
Power Switch Indicator is ON.  
Power Switch Indicator is ON.  
Volume Controls are turned up.  
Unit is extremely hot.  
• Partial short on the output. Check  
speakers and wires.  
Little volume.  
• Signal from source is already distorted.  
• Input signal too large for input type  
(reduce signal level applied to input).  
• Poor speaker connections.  
Transformer output load on wrong tap.  
• Bass control boosted too much.  
• Output too great for speakers, reduce  
level.  
DISTORTED SOUND  
Power Switch Indicator is ON.  
Volume up. Good volume.  
• Speakers wired out of phase.  
• Bass control set to cut side  
POOR  
Power Switch Indicator is ON.  
Volume controls are in normal,  
operational position.  
LOW FREQ.  
RESPONSE  
(NO BASS)  
Note: Transformer-coupled speakers have  
less bass response.  
• Poor electrical connections at input.  
• Shields of cables not connected.  
• Input cable routed near AC cables, power  
transformer, or other EMI radiating  
devices.  
• Electrically noisy devices operating on the  
same AC circuit.  
• Poor equipment grounding.  
- Ensure that all AC safety grounds are  
connected.  
Power Switch Indicator is ON.  
Volume controls are in normal,  
operational position.  
NOISE/HUM  
- Make sure that all components in audio  
chain are tied to the same ground.  
9
 
Warranty  
Bogen Classic Series Amplifiers are warranted to be free from defects in material or workmanship for two (2) years from the date  
of sale to the original purchaser.Any part of the product covered by this warranty that, with normal installation and use, becomes  
defective will be repaired or replaced by Bogen,at our option,provided the product is shipped insured and prepaid to:Bogen Factory  
Service Department, 50 Spring Street, Ramsey, NJ 07446, USA.The product will be returned to you freight prepaid.This warranty  
does not extend to any of our products that have been subjected to abuse, misuse, improper storage, neglect, accident, improper  
installation or have been modified or repaired or altered in any manner whatsoever, or where the serial number or date code has  
been removed or defaced.  
THE FOREGOING LIMITED WARRANTY IS BOGEN’S SOLE AND EXCLUSIVE WARRANTY AND THE PUR-  
CHASER’S SOLE AND EXCLUSIVE REMEDY. BOGEN MAKES NO OTHER WARRANTIES OF ANY KIND,  
EITHER EXPRESS OR IMPLIED,AND ALL IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR  
A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED AND EXCLUDED TO THE MAXIMUM EXTENT  
ALLOWABLE BY LAW. Bogen's liability arising out of the manufacture, sale or supplying of products or their use or disposition,  
whether based upon warranty, contract, tort or otherwise, shall be limited to the price of the product. In no event shall Bogen be  
liable for special, incidental or consequential damages (including, but not limited to, loss of profits, loss of data or loss of use dam-  
ages) arising out of the manufacture, sale or supplying of products, even if Bogen has been advised of the possibility of such damages  
or losses. 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.This warranty gives you specific legal rights, and you may also have other rights which vary from  
State to State.  
Products that are out of warranty will also be repaired by the Bogen Factory Service Department -- same address as above or call  
201-934-8500. The parts and labor involved in these repairs are warranted for 90 days when repaired by the Bogen Factory Service  
Department. All shipping charges in addition to parts and labor charges will be at the owner's expense.All returns require a Return  
Authorization number.  
Accessories  
RPK50 - Rack Mounting Kit  
Adapts Classic Series amps (Models C35, C60, and C100) for 19" rack  
mounting, 2 rack spaces (3-1/2")  
Heavy gauge steel construction  
WMT1A - MatchingTransformer  
Hi-Z, 10k-ohm primary impedance  
Lo-Z, 600-ohm secondary impedance, balanced with center tap  
Matches high-impedance unbalanced or low-impedance balanced signals  
Jumper selection allows line level signal to microphone level  
signal conversion  
50 Spring Street, Ramsey, NJ 07446, U.S.A.  
10  
 

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