Ampeg Classic User Manual

5
Classic Analog Bass Preamp
Classic Analog Bass Preamp Top Panel Features
1. INPUT: The signal output from an
instrument (active or passive) may
be connected to this 1/4" input by
means of an unbalanced shielded
instrument cable.
NOTE: There is a –15 dB pad jumper
located inside of the pedal. Details
on switching the jumper may be found
on page 7.
NOTE: Unplug the input cable when
not in use, as the 9V battery will drain
(and eventually die). Details on replacing
the battery may be found on page 7.
2. CLASSIC PREAMP SWITCH:
Engage this switch to activate
the Classic Preamp pedal. This pedal
is true bypass meaning the signal
will pass through from input to output
with no circuitry in between when
the switch is disengaged.
3. ON/OFF LED: This LED illuminates
purple when the pedal is engaged.
4. VOLUME: Use this to control the overall
output level. Use it wisely, and turn it
down when making connections or trying
something new. Unity is at 12:00.
NOTE: The volume control is active
only when the pedal is engaged.
5. BASS: Use this to adjust the low
frequency level. This provides up
to 7 dB of boost, or 20 dB of cut
at 40 Hz. The low frequency output
is flat at the center position.
6. ULTRA LO: This switch, when engaged,
enhances the amount of low-end output
by 2 dB at 40 Hz and –10 dB cut at
500 Hz.
7. MID: Use this to adjust the midrange
frequency level. This provides up
to 5 dB of boost, or 11 dB of cut
at 500 Hz. The midrange frequency
output is flat at the center position.
110
9
6
2
3
87
54
Rotate the control counter clockwise
for a “contoured” sound (more distant,
less midrange output) or clockwise
for a sound which really cuts through.
8. TREBLE: Use this to adjust the high
frequency level. This provides up
to 10 dB of boost, or 10 dB of cut
at 4 kHz. The high frequency output
is flat at the center position.
9. ULTRA HI: This switch, when engaged,
enhances the amount of high-end output
by 7 dB at 8 kHz.
10. OUTPUT: Typically, this 1/4" output
jack connects to the input of an
external power amplifier – or powered
loudspeakers, as long as they have
their own input controls to adjust
the volume level – by means of an
unbalanced shielded instrument cable.
However, it may be connected to an
external mixer, recorder, or interface.
In this way, you do not have to mic the
speaker cabinet in order to add it to the
main mix, or to record. The level of the
signal is affected by the volume control.

Ampeg Classic Specifications

Audio Specifications

signal to noise ratio	75 dB
maximum gain	+18 dB
bass tone control	+7/–20 dB @ 40 Hz
mid tone control	+5/–11 dB @ 500 Hz
treble tone control	+10/–10 dB @ 4 kHz
ultra hi	+7 dB @ 8 kHz
ultra lo	+2 dB @ 40 Hz / –10 dB @ 500 Hz

Impedance

input impedance	1 M @ Normal, 83 k w/–15 dB Pad
output impedance	120

Power Requirements

internal power	9V Battery
external power	9VDC, ≥20 mA, center negative

Weight and Dimensions

size (H x W x D)	2.2 in x 2.6 in x 4.5 in
size (H x W x D) metric	56 mm x 66 mm x 114 mm
weight	0.6 lb / 0.3 kg