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There are two sets of RCA jacks on the front end of your amplifier. The RCA
cables from your source unit go in the set labeled INPUTS. If your source unit doesn't
have RCA outputs don't worry. Simply add a set of RCA plugs (available at your
dealer) to your front or rear set of speaker leads (see drawing below), plug them
into the input jacks, and push in the -12dB input attenuation switch.
The Advanced Instrumentation Input has trickled down from the $15,000
PrecisionPower 2500F1. This circuit completely isolates the chassis ground from
the audio circuit of the amplifier and reduces 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 RCAcable.
15
On PCX 480, PCX 4125 and PCX 5800 amplifiers, we've taken bass control to a
higher level with QBASS PLUS™. The two QBASS™ switches (labeled 1 and 2)
on the front end of the amplifier allow you to select one of four frequency centers
30Hz, 36Hz, 44Hz and 60Hz. On the rear end plate you will find the QBASS™
level control and the plug-in for an optional QBASS REMOTE™ dash mounted
level control. Adjust the level control clockwise for up to +18dB of boost at your
selected frequency.
CAUTION: QBASS PLUS™ should only be used in systems with a strong subwoofer
section. +18dB is a tremendous amount of bass boost and may damage your
speakers if abused.
Optional QBASS REMOTE™: This boost control can be mounted in the dash and
will supersede the boost control on the endplate.
P r e c i s i o nP o w e rP C X ™ amplifiers no longer need an optional Q P O RT ™ to connect
m u l t i p l e QBASS PLUS™ equipped amplifiers while using one Q B A S S
REMOTE™. The new QBASS PLUS™ circuitry in the PCX™ amplifiers is now
positioned before the crossover circuit. In doing this, PrecisionPower engineers
have allowed you to daisy chain your RCAoutput to the next amplifier input, causing
the first amplifier’s Q BASS Remote™ to become the master control amplifier. See
your Authorized PrecisionP o w e r D e a l e r for more information!
Q BASS™ Settings
1 2 Freq.
IN IN 30Hz
IN OUT 36Hz
OUT IN 44Hz
OUT OUT 60Hz
For extra BOOM from your system, we’ve developed the QBASS™ bass control
circuit. The QBASS™ control is located to the left of the speaker outputs, and
allows you to add up to 12dB of boost centered at 40Hz by rotating the control
clockwise.
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