zapco SEQ, Руководство пользователя

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Input Gain Control
Calibration/Adjustment: The pre-amp circuit built into the SEQ is
capable of 26dB of gain. Separate left and right channel input gain and
adjustments are made via two access holes in the front cover.
Adjustment to the input gain may be necessary to match the source
(tape deck, tuner or CD) output level to the input sensitivity of the system
amplifiers. If this adjustment is set too low, the source may distort
before the system is able to achieve full power. If the input gain
adjustment is set too high, the internal circuitry of the SEQ and/or
system amplifiers may distort.
There are two clipping indicators, one for input stage clipping and one for
output clipping.
Insert a tape or compact disc recorded at high level into the source unit.
If the source unit has a balance control, ensure that it is set to center.
Set the SEQ filter controls flat (0dB). Using the small plastic screwdriver
included with the SEQ, adjust the input gain trim pots fully
counterclockwise. The trimpots are 20-turn pots. Turning each pot more
than 20 full turns counterclockwise will ensure that left & right channels
are matched before the gain adjustment procedure begins. If the source
has a volume control, set it from approximately 1/2 to 3/4 full output.
With the SEQ volume control rotated completely counterclockwise, begin
by turning one input gain pot clockwise (count the number of turns) until
the red input clip indicator flashes. Rotate the other input gain trimpot
the same number of turns as the first. Minor input gain adjustments may
be necessary to achieve left/right balance or for higher level tapes or
compact discs. Setting filter controls at a high boost position may also
cause the preamp output indicator to flash, requiring a reduction in input
gain.
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