B-band UST, Installation Instructions And User Manual

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6. CONNECTING THE TRANSDUCERS
AND WIRING TO THE PREAMP
6.1.
Open the preamp and see appropriate picture (below) for con-
nections. Connect the transducer(s), battery cable harness and if you
have A3.2, A4.2, A5 or A6, the output cable. At the A2.2 the battery
wire harness is pre-wired. Notice that the small holes on each connec-
tor of the transducer and battery cable harness should point upwards.
The exception is the AG-MIC condenser microphone (if applicable) -
the holes of the connector for the AG-MIC condenser mic should point
downwards. If UST or AST are connected improperly, a loud audible
hum will occur. Make sure that they are connected correctly.
6.2.
For the A2.2 thread the leads of the transducers trough the
smaller hole end of the preamp cover. Put the transducers at their
respective head pins (see picture below). The AST on the lower pins
and the UST on the upper pins.
Note the mini input gain control for the UST. With a small screw-
driver turn this fully clockwise. If needed, adjustment of this can be
done to preference later.
6.3. For the A2: inside there are four DIP-switches. Switch #1 is an
on-off switch for the treble boost on channel one (normally UST). Set
that at on-position if you prefer a mild treble boost. Switch #2 is an
on-off switch for the second channel bass roll-off 6 dB (-3 dB @ 500
Hz when at on-position). Set it at the on-position only when using a
condenser microphone to reduce low frequency feedback.
Switch #3 is an on-off switch for second channel bias-voltage (9-volt
phantom power). Set it at on-position only when you use condenser
microphone on the second channel. Switch #4 is an on-off switch for
channel two gain reduction (24dB at off, and 0 dB at on). This also
must be set it at on-position when you use a condenser microphone
or passive magnetic pickup connected to the second channel. From
the factory, all the switches are set at off-position.
A1
Battery wire
UST or AST
NOTE! HOLES IN CONNECTORS UPWARDS
A2
UST or AST
AST or MIC
Battery wire
#1
#2
#3
#4
NOTE! HOLES IN ALL CONNECTORS UPWARDS EX-
CEPT MIC CONNECTOR HOLES DOWNWARDS.
A2.2
UST
AST
Battery wire
UST GAIN TRIM CONTROL