Precision Power DCX 300.2 - Manual (Page 16)

INPUTS
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, then 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.
ADVANCED INSTRUMENTATION INPUT
The Advanced Instrumentation Input has been incorporated from
the legendary
PrecisionPower TM 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 RCA cables.
(+) Positive
(-) Negative
LEFT input
(+) Positive
(-) Negative
RIGHT input
eject
VOLUME
BASS TREBLE
RIGHT LEFT
BALANCE TRACK
REVERSE FOWARD
1 2 3 4
8 7 6 5
PPI MAR KET ING DPT
Trk 1
SOURCE Headunit
15