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SVPCL Bass Preamp
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1. INPUT: Connect your instrument
here by means of a shielded instru-
ment cable.
2. PAD: This switch, when depressed,
attenuates the input signal by 10dB.
Attenuation allows the Gain control
(#4) to be used at a higher setting. If
clipping is indicated with the Gain con-
trol close to fully counter clockwise,
attenuation is needed.
3. MUTE: This switch, when
depressed, mutes the signal at all out-
puts except the Tuner Output (#21).
4. GAIN: Use this control to adjust the
level of the signal going into the pre-
amp. For the best signal to noise ratio,
set this control so the Peak LED (#5)
flashes occasionally during loud pas-
sages.
5. PEAK: This LED flashes when the
signal level into the preamp approach-
es clipping. When the Mute switch (#3)
is depressed, this LED remains illumi-
nated as a visual indicator that the
Mute function is active.
6. ULTRA LOW: Use this five-position
rotary switch to select a setting for the
ultra low control, as follows:
1: Off – flat frequency response
2: Sub Cut – reduces frequencies
below the bass range to protect
the speakers
3: Low Cut Classic – provides a low
cut equal to the original SVT
4: Ultra Low Classic – contours the
sound to emphasize the low end
just like the original SVT
5: Ultra Low Modern – provides a
substantial low end boost
7. ULTRA HIGH: This switch, when
depressed, adds about a 16dB boost
to the high frequencies around 8kHz,
depending on the setting of the Gain
control (#4).
8. BRIGHT: This switch, when de-
pressed, adds a 6dB boost to the high
frequencies at 3kHz.
9. BASS: Use this control to adjust the
low frequency output level. This control
provides +17/-13dB at 20Hz.
10. MID: Use this control to adjust the
midrange frequency output level. This
control provides +/-20dB at the fre-
quency selected by the Mid freq con-
trol (#11).
11. MID FREQ: Use this control to
select the center frequency for the Mid
control (#10), as follows:
1: 220Hz
2: 450Hz
3: 800Hz
4: 1.6kHz
5: 3kHz
12. TREBLE: Use this control to adjust
the high frequency output level. This
control provides +18/-20dB at 7kHz.
13. MASTER: Use this control to
adjust the overall output level of the
preamp.
14. POWER: Use this switch to turn
the preamp on (top of the switch
depressed) and off (bottom of the
switch depressed). The adjacent
Ampeg logo illuminates green when
the preamp is on and the tubes are
warmed up.
The Front Panel: