High performance 4-channel mobile audio amplifier

2" H 13 1/4" W 8 1/8" D
5.08cm H 33.66cm W 20.64cm D



Available Finishes:

Power and style that amplifies

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.

PA660.4 Features:

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.


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


Total Frequency Response10Hz-30kHz 
Signal-to-noise (Referenced to rated power)75 dBA
Distortion at Rated Power0.9 %
Minimum Impedance Bridged4 ohms
Minimum Impedance Not Bridged2 ohms
High Pass Filter
Filter Slope12dB/oct 
Low Pass Filter
Filter Slope12dB/oct 
Effective Damping Factor>100 
Max Sensitivity250mV-5V (rear) dB


Product Weight (each)7.60 pounds
With Panels
Height2" (5.08cm) 
Width13 1/4" (33.66cm) 
Depth8 1/8" (20.64cm) 

Amplifier Specs

Channel NotesBridgeable Class AB MOSFET 
Total Dynamic Power600 watts
Bass Boost CharacteristicsVariable (0dB to +8dB) Hz
12V & Ground Cable Gauge4 AWG 


Total Shipping Weight9.60 pounds

Amplifier Power Specs

RMS Power at 14.4V
Watts per channel NOT bridged @ 1 kHz
4 ohms75 watts
2 ohms85 watts
Watts per channel bridged
4 ohms200 watts
Dynamic Power at 14.4V
Watts per channel NOT bridged @ 1 kHz
4 ohms150 watts
2 ohms170 watts
Watts per channel bridged
4 ohms300 watts

Specifications, dimensions and features subject to change without notice. For more information call us at 1-800-377-7655 (USA and Canada). Outside of North America call +1 (410) 358-3600.

PA660.4 Media

PA660.4 Literature

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PA660.4 Accessories