OPERATING THE SYSTEM
Thanks to the automatic power switching circuit, you just turn
your radio or tape player on and off in the normal way and The
Punch will turn on and off automatically. In high impedance
wiring, the signal to noise ratio is better when you turn the
volume knob full clockwise at the radio/tape player, and control
the volume at the preamp unit. In the low impedance wiring, on
the other hand, the signal to noise ratio is betterwhen the radio/
tape player volume knob is tuned to just short of distortion,
again controlling the system’s volume at the preamp unit,
GAIN CONTROL ADJUSTMENTS
If the signal coming into the preamp unit is too large, it could
cause clipping anddistortion in the preamp. Therefore, we have
included input level control adjustments in case they are
needed. To set these trimmer pots, it is necessary to use a small
screwdriver. The adjustments are located on top of the preamp.
When viewing from the front, the hole on the left is for the left
channel, and the one on the right is for the right channel. These
adjustments are shipped fully clockwise (full volume) from the
factory, preset for high impedance input. If a low impedance
input is to be used the trimmer pots should be turned fully
counter-clockwise.
EQUALIZER CONTROLS
When the “hi” and “low” frequency controls are in the counter-
clockwise position the response is flat with no boost. Each
clockwise position provides increasing boost. To adjust the
equalizer, start with any tone controls that may be located on
the radio or tape unit in the flat position (quite often this is full
clockwise). While playing some good program material, start
advancing the controls until the desired sound is produced.
Experience has indicated that it is usually easier to tell when you
have over-corrected than when you have under-corrected, so
try higher positions until you have over-corrected. Then back
down to a lower setting.
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