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16 © 2010 Polk Audio—all rights reserved © 2010 Polk Audio—all rights reserved 17
Loose or poor audio input Check line level connections and repair
or replace as needed.
Loose power connections Check power wires and ground connections
and repair or replace as needed.
Distorted output
Amplifier level sensitivity set
too high exceeding maximum
capability of amplifier
Readjust gain. Refer to the Adjusting the Sound of the
System section of this manual for detailed instructions.
Impedance load to amplifier too low Check speaker impedance load, if below 2 Ohm,
rewire the speakers to achieve higher impedance.
Shorted speaker wires Check speaker wires and repair or replace as needed.
Speaker not connected
to amplifier properly.
Check speaker wires and repair or replace as needed.
Refer to the Amplifier Settings section of this manual
for detailed instructions
Internal crossover not
set properly for speakers
Readjust crossovers. Refer to the Amplifier Settings
section of this manual for detailed instructions.
Speakers are blown Check system with known working speakers
and fix or replace as needed.
Poor bass response
Speakers wired with wrong polarity
causing cancellation at low frequencies.
Check speaker polarity and fix as needed.
Poor bass response
Crossover set incorrectly Reset crossovers. Refer to the Amplifier Settings
section of this manual for detailed instructions.
Impedance load at amplifier is too low. Check speaker impedance load if below 2 Ohm,
rewire speakers to achieve higher impedance.
Battery fuse blowing
Short in power wire or incorrect wiring. Check power wires and ground connections
and repair or replace as needed.
Fuse used is smaller than recommended. Replace with proper fuse size.
Actual current exceeds fuse rating. Check speaker impedance load if below 2 Ohm,
rewire speakers to achieve higher impedance.
Amplifier fuse blowing
Fuse used is smaller than recommended. Replace with proper fuse size.
Impedance load at amplifier is too low. Check speaker impedance load if below 2 Ohm,
rewire speakers to achieve higher impedance.
Speaker is blown with shorted outputs Check system with known working speakers
and fix or replace as needed.
Actual current exceeds fuse rating Check speaker impedance load if below 2 Ohm,
rewire speakers to achieve higher impedance.
SPECIFICATIONS
Amplifier PA330 PA660 PA880
Type Bridgeable Class AB
MOSFET
Bridgeable Class AB
MOSFET
Class AB MOSFET
Channels 2/1 4/3/2 1
RMS Continuous Power
@ 4 Ohm
75W x 2 75W x 4 300W x 1
RMS Continuous Power
@ 2 Ohm
100W x 2 85W x 4 500W x 1
RMS Continuous Power
Bridged @ 4 Ohm
200W 150W x 2 na
Dynamic Power @ 4 Ohm 150W x 2 150W x 4 500W x 1
Dynamic Power @ 2 Ohm 200W x 2 170W x 4 800W x 1
Dynamic Power Bridged @
4 Ohm
300W 300W x 2 n/a
Dynamic Peak Power 300W 600W 800W
Distortion at Rated Power <0.9% <0.9% <0.9%
Externally Bridgeable No No 9iÃ
Remote Gain Functions No No 9iÃ
Remote Gain Control Included n/a n/a 9iÃ
Minimum Impedance Bridged 4 Ohm 4 Ohm 4 Ohm
Minimum Impedance
1LÀ`}i`
2 Ohm 2 Ohm 2 Ohm
Signal-to-Noise Ratio 80dB 75dB 80dB
Frequency Response 10Hz - 30kHz +/- 0.5dB 10Hz - 30kHz +/- 0.5dB 10Hz - 30kHz +/- 0.5dB
Linear Bandwidth 10Hz - 30kHz +/- 3dB 10Hz - 30kHz +/- 3dB 10Hz - 30kHz +/- 3dB
Damping Factor >100 >100 >150
Crossover Filter Slope
`ÉVÌ>Ûi®
12dB/octave 12dB/octave 12dB/octave
Front Variable
High-Pass Switch
n/a 9ià n/a
Front High Pass Filter n/a ÓÊ*ÃÌÊ*ÊÀÊÕÊ
,>}i®
n/a
Front Gain Control n/a 250mV to 5V n/a
Rear High Pass Filter n/a ÎÊ*ÃÌÊ*]ÊÕ]Ê*® n/a
Rear Gain Control n/a 250mV to 5V n/a
Crossover Switch ÎÊ*ÃÌÊ*]ÊÕ]Ê*® n/a ÓÊ*ÃÌÊ*]ÊÕ®
Crossover Frequency Range 50Hz-500Hz n/a 50Hz-500Hz
Front Variable Bass Control n/a 6>À>LiÊä`ÊÌʳn`® n/a
Rear Variable Bass Control n/a 6>À>LiÊä`ÊÌʳn`® n/a
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6>À>LiÊä`ÊÌʳn`® ÎÊ*ÃÌÊä`]ÊÈ`]Ê
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