1. INPUT: Connect your bass guitar here using a shielded
instrument cable.
2. TUNER OUT: This jack is provided for connection to an
electronic tuner and is always “live,” even when the Mute
switch (#3) is engaged. This allows for “silent tuning” as well
as providing a monitor feed which stays hot even when the
house mix is muted. In addition, this jack may also be used
as a -6dB input (when not connected to a tuner).
3. MUTE: This switch, when depressed, mutes all outputs
except the Tuner Outs. This is excellent for tuning your bass
with an electric tuner without having to adjust any levels to
turn down your house volume. A footswitch can also be used
to control muting as long as the Mute switch on the front
panel is left in the “out” position. (The front panel switch is still
active with the footswitch connected. Please refer to #38, rear
panel.)
4. -15dB: This switch, when depressed, will attenuate the
input signal by 15dB. If your bass has active pickups, depress
this switch to better accommodate its output signal level.
5. GAIN: This controls the gain of the preamp. Adjust this
control until the Peak LED (#6) flashes on strong signal peaks
(but is not illuminated constantly while playing). To obtain the
best signal to noise ratio, set the Gain control to the highest
possible setting and adjust the Master (#19) to obtain the
desired volume level.
6. PEAK LED: This LED will illuminate when the preamp sig-
nal is nearing its clipping level, indicating optimum gain set-
ting.
7. COMPRESSION: This controls the amount of signal com-
pression. At the fully counter clockwise position there is no
compression; at fully clockwise the compression ratio is 10:1.
The sonic effect of compression is reduced dynamics,
increase sustain and a more consistent output level regard-
less of how light or hard the strings are played. The com-
pressor is very transparent – that is, there is very little effect
on the tone of your instrument.
8. ULTRA HIGH: This switch, when depressed, increases the
high frequency output by 6dB at 5kHz.
9. ULTRA LOW: This switch, when depressed, greatly
enhances the amount of low-end bass tones which you can
feel and hear, especially the low E and low B strings (5-string
basses).
10. BASS: This control allows for 12dB of cut or boost at
50Hz. The low frequency output is flat at the center position.
11. MIDRANGE: This control allows for 15dB of cut or boost
at the center frequency selected by the Frequency control
(see #12). The midrange output is flat at the center position.
12. FREQUENCY: This control allows you to select the cen-
ter frequency for the midrange control (#11), giving you a
choice of five “voices” for the midrange. The numbers corre-
spond to the following center frequencies as indicated:
1=220Hz, 2=450Hz, 3=800Hz, 4=1.6kHz, 5=3kHz.
13. TREBLE: This control allows for 19dB of cut or 14dB of
boost at 5kHz. The high frequency output is flat at the center
position.
14. BRIGHT: This switch, when depressed, adds a more live-
ly top end response to the input signal.
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