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BLACK WIRE: Negative ground - Connect to clean unpainted metal surface on
car chassis.
RED/WHITE WIRE: Remote turn on lead requires +12 volts; connect to power
antenna lead from radio. When this is not available you may connect to a +12
volts wire that is on with the ignition on or in the accessory position.
RCA CONNECTIONS: Connect with quality-shielded patch cords from source,
crossover, or any other sound processor.
MODE SELECTION: A switch, accessible through the plug on the bottom of the
amplifier, selects one of the three operating modes for the amplifier. Position A
(satellite mode): both front and rear outputs are high pass (80Hz and above) in
the 4503IQ. The subwoofer RCA output is active with subwoofer information for
another amplifier being supplied, 80Hz and below in the 4503IQ. Position B (bi-
amp configuration): the front outputs are high pass, 80Hz and above in 4503IQ
and the rear outputs become subwoofer outputs (80Hz and below). Position C is
full range operation front and rear. NOTE: In all modes both front and rear inputs
are required. You can use "Y" RCA connectors to accomplish this, if you are
using only one RCA cable coming from the radio.
SPEAKER CONNECTIONS: The speaker connections are accomplished by
connecting speaker wire to removable plugs. These plugs will accept up to a 12-
gauge speaker wire. Facing the plug while it is connected to the amplifier the
polarity for both plugs in Left (-), Left (+), Right (-), Right (+) with the left plug
being the front outputs and the Right being the rear outputs. The exception to this
is when in Position B of the mode selector: the front speaker plug is your high
pass output and the rear speaker plug is your low pass (or, subwoofer output).
MINIMUM OHM LOADS: Normal operation is 4 ohms per channel or 8 ohms
mono. The amplifier will operate at 2 ohms per channel or 4 ohms mono but the
following must be done: You must change the "power supply impedance
matching connectors". Remove faceplate and bottom cover and locate toroid coil,
just below it are two disconnects on taps marked "4". Change them to "2",
replace cover and complete installation. Failure to change these connections can
cause premature failure of your amplifier. NOTE: For speaker protection the
4253IQ has internal fuses. If there is no output check these fuses. Replace with
the same size fuse (4 amp). Over fusing is easily detectable and will damage
your amp.
GAIN ADJUSTMENT: There are two gain adjustments on the amplifier, one for
front and one for rear. Follow these directions for both: Set the amp gain to
minimum, turn the source up until it just starts to distort, then back down slightly.
This is the point where the output of the source is cleanest. Now adjust the
amplifier gain up until it just starts to distort and back down slightly. This will allow
the source and amp to reach maximum usable output at the same time.
© 2008 Linear Power, Inc. - ALL RIGHTS RESERVED
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LINEAR POWER™ is a trademark of Linear Power, Inc.
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