2
temporarily relocate the mic when you pack the
bass.
JACK INSTALLATION
Put the mounting plate between any two pairs of
strings as shown in the illustration. Make sure all
cables are placed so they do not vibrate against the
bass or each other.
CONNECTING THE SYSTEM
A single wire leads from the microphone to a 3-
conductor (TRS, Stereo) string mounted jack. A 12-
inch lead with a standard
¼
” phone plug comes
from the jack and should be plugged into your
pickup's output jack. The supplied 3 conductor
stereo cable carries the separate mic and pickup
signals to the preamp for mixing.
SETTING UP THE PREAMP
Remove the snap-off lid and insert a new 9-volt
battery. There is no need to undo any screws, the
lid simply snaps off.
Important: Please do not
tamper with the screw on the bottom of the
preamp!
There is a diagram of the controls inside the lid. The
tiny trim pot controls can be adjusted using the
small screwdriver conveniently supplied inside the
preamp. The mic channel has internal bass and
treble trimmers and the pickup channel has bass,
mid, and treble trimmers.
Some set-up time and patient experimentation will
give you the best results. We recommend that you
either have someone else play your instrument, or
position the speaker close to your ear for precise
listening; it is virtually impossible to accurately set
controls if you are hearing the acoustic sound from
your bass.
The two gain trimmers are designed to let you
equalize the volumes of both the mic and preamp,
so the external volume controls positions give you
the same amount of volume in the same positions.
This preamp is very powerful; if you get distortion
from overloading your amplifier’s input, reduce the
gain trimmer level.
Each channel has tone controls; they have a very
wide +/-20db range. Use a light touch, because a
tiny tweak can make a dramatic change. Make small
adjustments as necessary. After you find the best
settings, we recommend you leave the settings in
place and make adjustments at your amplifier to
compensate for new stage and room conditions.
The preamp has two output jacks. The MAIN output
is a mix of both the mic and pickup channels. The
MIC output carries only the mic signal.
TECHNICAL DATA
Preamp: 3"x3.5"x1.25"
Pickup channel input impedance: 1 MegOhm
Output impedance: 10K ohms
Input: Stereo 1/4"
Outputs: 1/4"
Power: 9-volt battery
Supplied with stereo connecting cable
