CA15
Acoustic Amplifier
User’s Guide
CA15 Acoustic Amplifier
The Front Panel:
1
2
3
4
5
6
7
8
9
10
11
1,3: Input 1, Input 2. The signal output from 9: CD Input. Use these jacks to connect the
your acoustic instrument, tape player,
rhythm machine, high-Z microphone or
other source may be connected to either or
both of these jacks by means of a shielded
signal cable. Each of the input jacks is
governed by its corresponding gain con-
trol (#2 for Input 1, #4 for Input 2). The
signals from these two jacks are summed
together after their gain stages.
output from a CD player, tape deck, or
rhythm machine to the amplifier. The CD
Input jacks are post EQ and Gain, so use
the level control on the CD player (etc.) to
adjust the level of the signal at these jacks.
10: Headphones. Use this jack to connect
headphones to the amplfier. The internal
speaker is disconnected when this jack is
used.
2,4: Gain 1, Gain 2. Use these controls to set
the input gain level for the corresponding
input jack. These controls set the level of
the input signal and serve as the amplifi-
er’s volume controls.
5: Low. This serves as the bass control for
both channels. Adjust this control to get
the best sounding bass response for your
instrument. Excessive boost of the low
control can cause an unnatural howling
(acoustic feedback from your instrument)
and should be avoided.
6: Mid. This serves as the midrange control
for both channels. Adjust this control to
get the best projection and midrange
tones for your instrument.
7: High. This serves as the treble control for
both channels. Adjust this control so your
high notes and harmonic overtones are
lively but not overpowering.
11: External Speaker. Use this jack to connect
the amplifier to an external speaker. The
internal speaker is disconnected when
this jack is used. The impedance of the
external speaker must be 4 ohms or
greater. Do not attempt to use head-
phones in the External Speaker jack!
Permanent hearing damage could result.
12: Power Switch. (Rear panel, not shown)
Use this switch to apply power to the
amplifier: the amp is on when the top of
the switch is depressed, off when the bot-
tom of the switch is depressed. The switch
illuminates when the amp is on.
13: AC Line Cord. (Rear panel, not shown)
The grounded power cord should only be
plugged into a grounded power outlet
that meets all applicable electrical codes
and is compatible with the voltage,
power, and frequency requirements stated
on the rear panel. Do not attempt to
defeat the safety ground connection.
8: Reverb Level: Use this control to adjust
the amount of reverberation added to the
signal. In the fully counter clockwise posi-
tion, the signal is dry (no reverb added).
As you rotate the control clockwise the
amount of reverb increases.
CA15 Acoustic Amplifier
Technical Specifications:
Output Power Rating: 12+ watts RMS @ 5% THD, 4 ohm load
Low: 15dB @ 80Hz
Mid: 15dB @ 650Hz
High: 15dB @ 10kHz
Input Impedance: 1.5M ohm
Max Input Signal: 7v peak to peak
Total System Gain: 52dB @ 1kHz
Input Sensitivity: 20mV
Internal Speakers: 8” Crate Custom Design, 4 ohm, 15 watts; Piezo Tweeter
Power Requirements: 120VAC, 60Hz, 30VA
100/115VAC, 50/60Hz, 30VA
230VAC, 50/60Hz, 30VA
Size and Weight: 14”H x 14”W x 12”D, 21 lbs.
System Block Diagram:
CHANNEL 1:
POWER AMP
EQ
EXTERNAL
SPEAKER
INPUT
GAIN
GAIN
REVERB
LEVEL
LOW MID HIGH
REVERB
SPEAKER
CHANNEL 2:
INPUT
CD
INPUT
HEAD
PHONES
ATTENUATOR
Declaration Of Conformity
#33, Effective 01-01-2001
SLM Electronics
Manufacturer’s Name:
Production Facility:
1901 Congressional Drive, St. Louis, MO 63146, USA
700 Hwy 202 W, Yellville, AR 72687, USA
1400 Ferguson Ave., St. Louis, MO 63133, USA
1400 Ferguson Ave., St. Louis, MO 63133, USA
Production Facility:
Shipping Facility:
Office Facility:
Product Type:
Audio Amplifier
Complies with the following Standards:
Safety:
EMC:
EN60065, E60065, C22.2, UL6500 and/or UL813
Directive 89/336/EEC, EN55103, EN55013, EN61000,
and/or FCC 47CFR 15B clA
Supplementary information provided by:
SLM Electronics - R & D Engineering
1901 Congressional Drive, St Louis, MO 63146, USA
Tel.: 314-569-0141, Fax: 314-569-0175
Specifications and information in this manual are subject to change without notice.
©2004 SLM Electronics • A Division of St. Louis Music Co.
1400 Ferguson Avenue • St. Louis, MO 63133
47-936-01 • 022404
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