Rear Panel Connections - Mesa/Boogie Studio Preamp Owner's Manual

OUTPUT LEVEL (A & B): This pair of controls determines the overall level being sent form Main
Outs A & B (and Recording Outs A & B) to your power amp (or mixing console). To get the best sig-
nal-to-noise ratio and to avoid clipping, the levels must be set neither too low nor too high. If you
need guidance in setting these levels, try the following method:
Start by setting both Output controls to zero. Next, set the Master control at "5" and the Lead Master
at "4". Set the Lead Drive at "6" and the Volume at "7". With these settings, the volume levels of the
Rhythm and Lead Modes will be about equal. Now we are ready to bring up the Outputs.
With the Power and Standby switches in the Preamp and power amp in the "ON" position, slowly
bring up OUTPUT LEVEL A to the desired listening level.
(Depending on the power amp being used, the setting will most likely be very low, probably
between 2 and 4). Next, increase OUTPUT LEVEL B until its level equals that of OUTPUT A. (Don't
be surprised if the number settings on the two outputs are slightly different when equal levels are
attained. This sometimes occurs because of slight variances in the resistor values of the potentiome-
ters.) If effects are in use in the Effects Loop and the effects send level seems too high or low, try
adjusting the INPUT LEVEL or HEADROOM control on the effect device first, if the level is still not
optimum, adjust the Preamp's Master and Lead Master controls as needed, and then re-adjust the
OUTPUT LEVEL controls to compensate.
POWER SWITCH (and Pilot Light): This is the AC Power On/Off switch for the Preamp. When
its pilot lamp is lit, it indicates that AC voltage is being supplied to the Preamp.
STANDBY SWITCH: The Standby Switch shuts off the signal at the effects send stage. When the
Preamp is in Standby mode, any noise produced by devices in the effects loop will be audible (but
the signal "content will not be). If this noise is objectionable or undesirable, use the Standby switch-
es on your power amp to must the noise.
We recommend switching the Preamp into its Standby mode 1) during "power-up (leave in standby
for about 30 seconds); 2) while patching in instruments and effects; 3) during set breaks at gigs or
rehearsals; and 4) before "powering down".
MODE/EQ LED INDICATORS: These three red LEDS (located under the tone controls) indicate
whether you are in the Rhythm or Lead mode, and whether the EQ is active or not.

4. REAR PANEL CONNECTIONS

INPUT: This 1/4" jack is one of two possible inputs that can be chosen; the other input location is
on the front panel. The front panel input and rear panel input are identical in function and the
choice is simply one of convenience. The input jacks are insulated mono jacks designed to handle
one instrument. (We don't recommend using both of them at once.) Always use a high-quality
shielded cable to connect your instrument to the Preamp.
LEAD/RHYTHM FOOTSWITCH: This jack will accept either the Lead/Rhythm footswitch includ-
ed with your Preamp (or any standard grounding-type footswitch) or connections from an external
switching system such as MESA/Boogie MIDI Matrix. It allows remote switching between Lead
and Rhythm modes.