If you want to get the maximum performance from your loudspeakers and subwoofers, definitely add a Polk PA D amplifier or two. We offer 2-channel, 4-channel, 5-channel and monoblocks. Each PA amp is styled lean and plays meaner, with enough big, fat juicy watts to drive your system so you get to hear all of your music, no matter where and how loud you like to play.

PA 660.4 4 Channel Amplifier

High performance 4-channel mobile audio amplifier

The PA660.4 is a four-channel class A/B amplifier with built-in fully variable low-pass crossover. Equipped with remote gain, the PA660.4 is capable of two-channel operation with a maximum power of 600 Watts when both the front and rear bridged channels are driven into 4 ohms speaker loads.

RRP $399.00 AUD

Product Manual

75 Watts x 4 continuous, 85 x 4 dynamic power (2 ohm load), 4 channel mode.

150 Watts x 2 (4 ohm) continuous power, 2 channel mode.

CEA-2006 compliant specifications for true, accurate power ratings.

4-channel, dual bridge-mono (2-channel), or dual simultaneous stereo/mono operation provide a variety of configurations and setups: 4-channel for front and rear speakers; 2 speakers and a sub; 2 subwoofers

2 ohm stable 4-channel operation.

High-speed MOSFET switching power supply and high current bipolar output transistors pump maximum voltage and high current to your speakers or subwoofers.

Double layer fiberglass epoxy printed circuit boards for more rigidity, less shrinkage and a smaller overall amp footprint.

6-way Smart System Protection (SSP) circuits

Variable bass boost (0dB, +8dB) for extra bass thump.

Variable input gain optimizes match with different signal sources (250mv to 8V).

RCA outputs (front channels only) for easy daisy chaining of other amplifiers.

Mounting hardware with rubber isolation grommets and extra fuses included.

Light bar/fan output-connect an optional LED light bar or cooling fan for custom installations.

Multi-color status LED gives instant information on amplifier operation.


Total Frequency Response 10Hz-30kHz 
Signal-to-noise (Referenced to rated power) 75 dBA
Distortion at Rated Power 0.9 %
Minimum Impedance Bridged 4 ohms
Minimum Impedance Not Bridged 2 ohms
High Pass Filter
Filter Slope 12dB/oct 
Low Pass Filter
Filter Slope 12dB/oct 
Effective Damping Factor >100 
Max Sensitivity 250mV-5V (rear) dB


Product Weight (each) 7.60 pounds
With Panels
Height 2" (5.08cm) 
Width 13 1/4" (33.66cm) 
Depth 8 1/8" (20.64cm) 

Amplifier Specs

Channel Notes Bridgeable Class AB MOSFET 
Total Dynamic Power 600 watts
Bass Boost Characteristics Variable (0dB to +8dB) Hz
12V & Ground Cable Gauge 4 AWG 


Total Shipping Weight 9.60 pounds

Amplifier Power Specs

RMS Power at 14.4V
Watts per channel NOT bridged @ 1 kHz
4 ohms 75 watts
2 ohms 85 watts
Watts per channel bridged
4 ohms 200 watts
Dynamic Power at 14.4V
Watts per channel NOT bridged @ 1 kHz
4 ohms 150 watts
2 ohms 170 watts
Watts per channel bridged
4 ohms 300 watts