Ampeg PF-350 - Manual (Page 5)

PF-350 / PF-500 / PF-800 Bass Guitar Amplifier
5
PF-350 Front Panel
1. INPUT: The signal output from an
instrument (active or passive) may be
connected 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 that the peak LED [3] comes on
regularly. It will reduce the chance of
overdriving the preamplifier stage, and
allow more usable range and fine
adjustment of the gain control.
3. PEAK LED: This red warning LED will
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,
midrange and treble controls. If it comes
on regularly, even when these controls
are low, try engaging the –15 dB
pad [2].
4. GAIN: This varies the amount of signal
driving the preamplifier. If a small
clockwise rotation from minimum leads
to overloading and the peak LED
illuminating, try engaging the –15 dB
pad. This will give more usable range
with the gain control.
5. BASS: Use this to adjust the low
frequency level of the amplifier. This
provides up to 14 dB of boost, or
–12 dB of cut at 40 Hz. The low
frequency output is flattest at the center
position.
6. MIDRANGE: Use this to adjust the
midrange 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
frequency level of the amplifier. This
provides up to 19 dB of boost, or
–25 dB of cut at 8 kHz. The high
frequency output is flattest at the center
position.
8. VOLUME: Use this to control the
overall output level. It affects the
speaker outputs and preamp level to the
headphone output. Use it wisely, and
turn it down when making connections,
putting on headphones, or trying
something new.
13 12 11 10 9 8 7 6 5 4 3 2 1
input pad
-15dB
bass gain midrange treble volume limiter
audio
in
phones
PF 350
peak limit
0 10 0 10 0 10 0 10 0 10
fault