User Manual

Micro-VR Bass Guitar Amplifier
4
The Front Panel
1. INPUT: The signal output from an instru-
ment (active or passive) may be con
-
nected to this 1/4" input by means of a
shielded instrument cable.
2. –15 dB PAD: Press this switch in to
reduce the input signal by 15 dB and
compensate for higher output sources.
This attenuation is suited for use with
basses that have active electronics or
high-output pickups. Use this pad if you
notice the peak LED [3] comes on regu
-
larly. It will reduce the chance of over
-
driving the preamplifier stage, and allow
more usable range and fine adjustment
of the gain control.
3. PEAK LED: This red warning LED may
come on if: the input signal is too high,
the gain control is set too high, or there
is too much boost from the bass, mid
-
range and treble controls. If it comes on
regularly, even when these controls are
low, try engaging the –15 dB pad.
4. GAIN: This varies the amount of signal
driving the preamplifier. If a small clock
-
wise rotation from minimum leads to
overloading and the peak LED coming
on, try engaging the –15 dB pad. This
will give more usable range with the gain
control.
5. BASS: Use this to adjust the low fre
-
quency level of the amplifier. This pro
-
vides up to 14 dB of boost, or 12 dB of
cut at 40 Hz. The low frequency output
is flat at the center position.
6. MIDRANGE: Use this to adjust the mid
-
range frequency level of the amplifier.
This provides up to 5 dB of boost, or
13 dB of cut at 500 Hz. The midrange
frequency output is flat at the center
position. Rotate the control counter
clockwise for a “contoured” sound
(more distant, less midrange output) or
clockwise for a sound which really cuts
through.
7. TREBLE: Use this to adjust the high fre
-
quency level of the amplifier. This pro
-
vides up to 19 dB of boost, or 25 dB of
cut at 8 kHz. The high frequency output
is flat at the center position.
8. VOLUME: Use this to control the overall
output level. It affects the speaker out
-
puts [17], and headphones output [12].
Use it wisely, and turn it down when
making connections, putting on head
-
phones, or trying something new.
9. LIMITER SWITCH: Press this switch in
to add the limiter circuit. If the signals
driving the amplifier start to peak, the
limiter will automatically reduce the
signals to prevent clipping, and the LED
[10] will flash. The limiter will help keep
the amplifier’s output “clean” up to high
output levels and avoid potentially dam
-
aging distortion.
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