This product is a vintage Polk model and is not available for sale, but it may still be available in some stores as a closeout or used product. The following text is taken from the original sales brochure for this product and does not reflect current availability. If you happen to have any question or concerns about this product, or any other Polk Audio product, feel free to contact our Customer Service Department at 1-800-377-7655 Monday - Friday, 9am - 5:30pm EST

PA1100.5 (5/4/3 channels)

5-channel mobile audio amplifier

Available Finishes:

Mobile Power and Style that Amplifies

The PA1100.5 has enough channels and power to run your entire system. A common setup is to run 4 full range speakers and one subwoofer. You can even bridge the subwoofer channel to a PA600.1 for even more power!

PA1100.5 Features:

5-channel amplifier-enough for the entire system!

125 Watts x 4 (2 ohm) and 600 x 1 (1 ohm) continuous power; 250 x 4 (2 ohm) and 1200 x 1 (1 ohm) dynamic power. CEA-2006 compliant specifications for true, accurate power ratings.

2 ohm stable 4-channel operation and 1 ohm stable on mono subwoofer channel.

Super efficient class D pulse-width modulation amplifier design. Draws less power and runs cooler so you won’t heat up the inside of your vehicle or make the headlights dim.

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 and less shrinkage, with plated through-holes instead of jumpers, for twice the amount of component contact area. Efficient layout packs more circuitry, with tighter component tolerances, into a smaller circuit board for a smaller overall amp footprint.

6-way Smart System Protection (SSP) circuits: Power and ground-reversal protection, thermal and short protection, current overdraw and low impedance protection circuits with auto-standby mode ensure safety, reliability and durability.

Anodized extruded brushed-aluminum cover for maximum heat dissipation and great looks!

Cast aluminum textured end caps for optimized heat dissipation and hiding of connectors. Solid aluminum logo and model panel back lit in cobalt blue.

Fully adjustable 12 dB/octave high or low-pass crossover. Defeatable for full range (flat) operation (front and rear channels only).

Switchable 24 dB/octave subsonic filter protects ported subwoofers (subwoofer channel only).

Switchable 8 dB bass boost at 40Hz for extra bass thump.

Variable input gain optimizes match with different signal sources (250mv to 7.5V).

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.

Remote subwoofer level adjuster for subwoofer channel included.

RCA output (subwoofer channel only) for easy daisy chaining of other amplifiers.


Total Frequency Response20-20 KHz main channels, 20-250 Hz sub channel 
Signal-to-noise (Referenced to rated power)98 dBA
Protection Circuitry3 x 40 amp fuse, Power and Ground-Reversal Protection, Thermal and Short Protection, Current Overdraw and Low Impedance Protection circuits 
Subsonic FilterYes, sub channel only 
High Pass Filter
Filter Slope12 dB/oct 
Filter Frequency50-500 Hz 
Low Pass Filter
Filter Slope12 dB/oct 
Filter Frequency50-500 Hz 
Effective Damping Factor>150, >50 sub channel 
Input Impedance20.0000 k ohms
Max Sensitivity250 mV to 7.5 dB


Product Weight (each)24.00 pounds
With Panels
Height2 9/16" (6.51cm) 
Width26 5/16" (66.83cm) 
Depth10 1/4" (26.04cm) 

Amplifier Specs

Power Specs125 watts x 4 (@ 2 ohm) and 600 watts x 1 (@ 1 ohm) Continuous
80 watts x 4 (@ 4 ohm) and 280 watts x (@ 4 ohm) 
Bass Boost Characteristics+8 dB @ 40 Hz Hz
12V & Ground Cable Gaugeminimum 8 AWG 


Total Shipping Weight26.00 pounds

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.

PA1100.5 Media

PA1100.5 Literature

Want to know more? Want to dig just a little deeper to learn about this product? Here's a list of source material that will give more detail, other perspectives, and answer questions you may have.

PA1100.5 (5/4/3 channels) Accessories