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The Front Panel:
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2
3
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The Instrument channel:
1: Input. The signal output from your acoustic instrument may be connect-
ed here by means of a shielded instrument cable.
2: Piezo/Active. Use this switch to select the type of pickup on your instru-
ment. For active electronic pickups, set the switch to "active" (switch out).
For passive/magnetic pickups, set it to "piezo" (switch depressed).
3: Gain. This serves as the input level control for the Instrument channel of
the amplifier. For the best signal to noise ratio set this control so the Peak
LED (#4) flashes when playing your instrument fairly hard.
4: Peak. This LED flashes when the signal level into the preamp approach-
es clipping. Adjust the Gain control (#3) until a strong signal from your
instrument causes this LED to flash.
5: Low. This serves as the Instrument channel's primary bass control. Adjust
this control to get the best sounding bass response for your instrument.
Excessive boost of the low control can cause an unnatural howling and
should be avoided.
6: Mid. This serves as the Instrument channel's primary midrange control.
Adjust this control to get the best projection and midrange tones for your
instrument. The center point of the mid control is chosen by the setting of
the contour control (#7).
7: Contour. Use this control to set the center point of the mid control (#6).
Set this control at the frequency which gives you the most natural-sound-
ing midrange tones.
8: High. This serves as the Instrument channel's primary treble control.
Adjust this control so your high notes and harmonic overtones are lively
but not overpowering.
9: Freq. Use this control along with the Cut control (#10) to eliminate instru-
ment feedback. For information on the proper use of this control, please
read the section entitled "To Eliminate Instrument Feedback" on page 6.
10: Cut. Use this control along with the Freq control (#9) to eliminate instru-
ment feedback. For information on the proper use of this control, please
read the section entitled "To Eliminate Instrument Feedback" on page 6.
11: Rev/Eff Send. Use this control to adjust the amount of internal reverb
and/or external effect (if used) for the Instrument channel.
12: Chorus On/Off. This switch, when depressed, applies the internal cho-
rus effect to the Instrument channel.
13: Chorus Depth. Use this control to adjust the magnitude of the chorus
effect. Rotating this control clockwise increases the intensity of the effect.
14: Chorus Rate. Use this control to adjust the rate of the chorus effect.
Rotating this control clockwise increases the rate at which the effect
occurs.
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CA125D Acoustic Amplifier
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8
9
10
18
19
20
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12
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The Vocal/Mic channel:
15: Low-Z. The signal output from a low impedance microphone may be
connected here by means of a shielded, balanced microphone cable ter-
minated with an XLR connector. The Low-Z jack has 15 volts phantom
power applied to pins 2 and 3. (Mics not requiring phantom power will
not be affected.)
16: High-Z. The signal output from a high impedance microphone or a line
level signal may be connected here by means of a shielded signal cable
terminated with a 1/4" tip/sleeve connector.
17: Gain. This serves as the input level control for the Vocal/Mic channel of
the amplifier. Adjust this control for the best mix with the signals from the
other channels.
18: Rev/Eff Send. Use this control to adjust the amount of internal reverb
and/or external effect (if used) for the Vocal/Mic channel.
The Aux channel:
19: High-Z. The signal output from a high impedance microphone or a line
level signal may be connected here by means of a shielded signal cable
terminated with a 1/4" tip/sleeve connector.
20: Gain. This serves as the input level control for the Aux channel of the
amplifier. Adjust this control for the best mix with the signals from the
other channels.
21: Rev/Eff Send. Use this control to adjust the amount of internal reverb
and/or external effect (if used) for the Aux channel.
The Effects Section:
22: Mode. Use this control to select the type of Digital Signal Processing effect
applied to the output signal. For a listing of the effects, please see the sec-
tion entitled "The DSP Section" on page 6.
23: Rev. Level. Use this control to adjust the amount of the internal DSP effect
– the further you turn to the right the deeper the effect.
24: Eff Return. Use this control to adjust the amount of effect applied from an
external signal processor (if used).
The Master Section:
25: Graphic EQ. Use these sliders to control the output frequencies indicated
below each control. The center position of each control is flat (no boost or
cut). Use the graphic EQ to adjust the output of the CA125D to best suit
your tastes and to compensate for room acoustics.
26: Level. Use this control to set the overall output level of the amplifier.
27: Power. Use this switch to apply power to the amplifier: the amp is on
when the top of the switch is depressed, off when the bottom of the switch
is depressed. This switch will illuminate when the amplifier is on.
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