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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.
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 to the IN position -12dB input attenuation switch.
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If your grand total current draw is over 100 amps (or total output power is over
600 watts), you are probably exceeding the capability of your charging system.
Dimming lights and fluctuating voltage are solid indicators that you need to
upgrade your alternator, battery, or both. Keep in mind that your amplifiers simply
convert electrical energy to acoustical energy, and any electrical deficiency will
compromise the performance of your sound system. For more information about
charging system upgrades, see your local authorized PrecisionPower Dealer or
call PrecisionPower Technical Support at 1-800-62POWER x 229.
Locate an area near the amplifier(s) that is metal and clean an area about the size
of a quarter to bare metal. Inspect the area around and underneath to be sure you
won't drill into wires, brake or fuel lines, etc. Drill a pilot hole in the middle of this
area. Terminate the ground wire with a ring connector and attach it to the bare
metal using a #8 sheet metal screw and washer or preferably, a bolt, nut and a
star washer (not supplied). We suggest crimping and soldering this connection.
After the connection is complete, coat the area (on both sides) with silicone or
some similar material to prevent rust from developing on the bare metal. If your
grand total current draw is over 50 amps (or total output power is over 300 watts),
you should run a separate ground wire beside your power wire from the battery
to the amplifier(s). Keep the ground and power wires as close together as possi-
ble, and use the same gauge wire for both. This will ensure that you have a good
ground path, and may eliminate such potential problems as engine noise and
overheated amplifiers.
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