Precision Power PPI4240 User Manual
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For extra BOOM from your system, we’ve developed the QBASS™ bass
control circuit. The QBASS™ control is located to the left of the crossover
switches and allows you to add up to 12dB of boost centered at 40Hz by
rotating the control clockwise.
This circuitry is capable of eliminating noise radiated into your signal cables
by up to 40dB. This is equivalent to a noise reduction of approximately one
hundred times what the noise level would be without this circuitry. It provides
all the benefits of a true ‘balanced’ line without the need of any special
cables (see diagram below). This type of input works with any conventional
RCA cable.
CAUTION!
QBASS™ should only be used in systems
with strong subwoofers. 12dB is a lot of bass boost and could
damage full range speakers.