Polk Audio built their reputation by making some of the best speakers in the world. Now, they've extended their engineering expertise to their PA Series car amplifiers. These amps offer outstanding sound quality, low impedance stability, and a distinctive, stylish look.

The PA400.1 monoblock amp can deliver up to 400 watts RMS, and it handles loads down to 1 ohm without breaking a sweat, giving you more flexibility in powering your subwoofer setup. You'll find the variable low-pass filter, selectable bass boost, phase switch, and subsonic filter useful for tuning your system for maximum efficiency and sound quality.

An optional wired remote control lets you adjust your sub amp's volume from the driver's seat. If you're into the show, a connector provides power for an optional external LED light array and fan, so your amp will run and look cool.

Product Highlights:

  • mono subwoofer amplifier
  • 200 watts RMS x 1 at 4 ohms (300 watts RMS x 1 at 2 ohms)
  • 400 watts RMS x 1 at 1 ohm (1-ohm stable)
  • CEA-2006 compliant
  • Class D amp with MOSFET output and power supply
  • variable low-pass filter (30-250 Hz, 12 dB/octave)
  • selectable bass boost (8 dB) at 40 Hz
  • subsonic filter (30 Hz, 24 dB/octave)
  • preamp outputs
  • output phase switch
  • optional wired remote volume control
  • LED/fan connector powers optional external fan and LEDs
  • fuse rating: 25A x 2
  • 8-gauge power and ground leads recommended — wiring and hardware not included with amplifier
  • 10-5/16"W x 2-9/16"H x 10-9/16"D
  • warranty: 1 year
  • Our 60-day money-back guarantee

My system has plenty of power. Who needs an amp?

You might think you don't need an amp because you have a 400-watt system in your car, or because your new stereo puts out 50 watts a channel. But those are peak wattage ratings, which may boil down to 15 or 20 watts per channel, using the more realistic RMS rating. An amp sends your speakers the power they need to deliver your music with clarity and impact, whether you're using factory speakers or high-performance components. And low-frequency reproduction requires lots of power, so an amp is an absolute must if you're adding a sub to your system.

Hands-on research

What's in the box?

Download owner's manual

  • Monoblock amplifier with two 25 amp fuses inserted into chassis
  • 2 Spare 25-amp fuses
  • Remote gain knob
  • 16' Remote knob cable
  • LED/Fan harness
  • 4 Large mounting screws
  • 2 Small mounting screws
  • 4 Lock-washers
  • 4 Flat-washers
  • 4 Self-adhesive foam grommets
  • Owner's Manual
  • On-line Product Registration card

Product Research

Features
Controls
Connections

Features

CEA-2006 Compliant: CEA-2006 is a new system of testing and measurement methods for mobile audio amplifiers. This voluntary standard advocates a uniform method for determining an amplifier's RMS power output and signal-to-noise ratio. The criteria for measuring power uses a DC input voltage of 14.4 volts and the RMS power output is measured into a 4-ohm load, with 1% or less Total Harmonic Distortion (THD) plus noise, and at a frequency range of 20 Hz to 20,000 Hz when applicable. Signal-to-Noise ratio is measured in weighted absolute decibels (dBA) at a reference of 1 watt into 4 ohms. CEA-2006 allows consumers to compare car amplifiers and receivers on an equal basis. The Polk Audio PA400.1 under CEA-2006 regulations is rated at 200 Watts RMS x 1 channel with a 60dBA signal to noise ratio.

Mono-Power Amp Design: The Polk Audio PA400.1 is designed with specific features to power your subwoofers with a frequency range between 20-250 Hz. This amplifier is not designed to power a full-range speaker.

1-Ohm Stable: The PA400.1 amplifier features a 1-ohm stable design so it can drive even the most demanding subwoofers. The amplifier is rated at 400 watts RMS  x 1-channel at 1-ohm.

Class D Amplifier: The Polk Audio PA400.1 employs a super efficient Class D pulse-width modulation amplifier design. This type of amplifier design draws less power and runs cooler so you won't heat up the inside of your vehicle or make the headlights dim.

MOSFET Power Supply: The amplifier's high-speed MOSFET switching power supply and high current Bipolar Output Transistors pump maximum voltage and high current to your speakers or subwoofers.

Parallel Connection: The amplifier is equipped with two pairs of chrome-plated speaker terminals for an easy parallel subwoofer connection when connecting only one subwoofer.

Double Layer Fiberglass Epoxy Printed Circuit Boards: The amplifier employs 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. This 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.

Status LED: The amplifier features a Status LED which will illuminate Green to indicate the amplifier is on and operating normally, and will be illuminated Red if the amplifier shuts down due to short circuit, DC offset, or overheating detected by onboard protection circuitry.

Aluminum Construction: The amplifier features an anodized extruded brushed-aluminum cover and textured end caps for maximum heat dissipation. The cast aluminum textured end caps optimize heat dissipation and hide and protect the amplifier's connections and controls. The end caps are removable to access the amplifier's connections. The amplifier also features a solid aluminum logo and model number panel which is back lit in cobalt blue.

Controls

Gain Control: The Gain Control operates the amplifier's sensitivity and is used to match the input level of the amplifier to the output level of your signal source (headunit).

Crossover: The amplifier features built-in 12 db/octave variable low-pass crossover which can be set between 30 to 250Hz to fine tune your connected subwoofers.

Bass EQ: The amplifier employs an 8 dB bass boost at 40Hz for added bass response.

Subsonic Filter: The PA400.1 utilizes a defeatable 24 dB/octave subsonic filter to eliminate very low frequencies below 30Hz that are difficult to reproduce, rob amplifier power, increase distortion and can damage speakers.

Phase Switch: The PA400.1 features a 0-degree or 180-degree selectable Phase Switch for switching the phase output of your connected subwoofer.

Remote Gain Knob: The PA400.1 amplifier comes supplied with a wired remote gain knob which allows you to control the amplifier gain from a remote location in your vehicle for ease of adjustment during listening. The remote gain knob comes with a 16' cord which plugs into the back of the remote gain knob and the amplifier. The remote gain knob features integrated flanges and comes supplied with two philips-head screws for mounting the device. The remote gain knob measures 2.645" wide x 0.745" tall x 1.965" deep.

Connections

Power: The amplifier is equipped with a 0.4375" chrome-plated screw-terminal to connect through a fuse or circuit breaker to the positive terminal of the vehicle battery or the positive terminal of an isolated audio system battery using a 8-gauge power wire (minimum). The Power terminal will accept up to 4 AWG power wire.

Ground: The amplifier is equipped with a 0.4375" chrome-plated screw-terminal which connects directly to the sheet metal chassis of the vehicle using the shortest 8-gauge wire (minimum) necessary to make the connection. The Ground terminal will accept up to a 4 AWG ground wire.

Remote Turn-On: The amplifier features a 0.3125" chrome-plated screw-terminal which turns on the amplifier when 12-volt is applied to it. This terminal should be connected to the remote turn-on lead of your headunit or signal source.

Speaker Terminals: Four 0.3125" chrome-plated screw-terminals for connection to your subwoofer or subwoofers using 16 to 12-gauge speaker wire.

Fuses: The amplifier features two 25-amp fuses to protect the amplifier against internal electrical damage. The amplifier comes with two inserted fuses and two spare fuses.

RCA Input Jacks: One pair of chrome-plated stereo RCA jacks which accepts the line-level output from your headunit or signal processor at voltages between 150mV and 7.5 Volts.

RCA Line Output Jacks: One Pair of chrome-plated stereo RCA pass-through jacks which can be used to send the input signal to a second amplifier in your system unaltered.

Remote: Remote input for supplied wired Remote Gain Knob.

LED/Fan Input: This input allows connection of an optional LED light bar or optional cooling fan for the amplifier using the supplied Power/Remote/Ground harness.

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team — they open the box, verify contents, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Polk Audio PA400.1 Reviews

Average Customer Review:

3 reviews
Review this product
Great Gear Giveaway

Submit a review and then enter to win a $500 rewards card

(0)
(0)
(0)
(0)
(0)

Review this product:

Thanks for taking the time to share your experiences about this product. Please be sure to focus your comments on the product itself. Read our Review Guidelines for more information.

Your email won't be visible. Please use the email address that is associated with your order.
(e.g., JohnD) Your review will be signed using the display name and location
(e.g., Charlottesville, VA)

Click on a star to rate the overall product on a scale of 1-5
1500 characters left
  Attach a YouTube Review
Crutchfield Video Review Guidelines
  • Only submit videos that you made or are authorized to use.
  • Do not submit videos that contain music, video or visuals that are copyrighted and belong to someone else.
  • Please see our Review Guidelines for more information.
500 characters left
500 characters left

Awesome

Written By John, Concord, NH on Monday, July 13, 2009

Awesome amp! Have it running the db1212 great packaged deal! This amp if straightforward the isntructions it comes with are great. Make sure to turn the gain up when testing it as well. Highly recomend this.

Clear Sound

Written By Kris, Glastonbury, CT on Monday, May 18, 2009

Crutchfield Customer Review (What's this?)

i bought this amp with the polk audio db1212 and it sounds really clear and gives me plenty of boom or if i decide gives me that backround bass my speakers lacked...many lows that were missing that i was able to discover with the matching sub and this amplifier!!

Nice amp

Written By Ryan, Green Bay, WI on Saturday, March 28, 2009

Crutchfield Customer Review (What's this?)

Really like this amp. I am running a capacitor with it just to help save my electrical system. Good sound and nice quality. The amp seems really durable and if you make an amp rack you can easily hide the wires thanks to the metal cover.

Get everything you’ll need to enjoy your new Polk Audio PA400.1

You'll need an amp wiring kit to install your new amplifier, as wiring is not included.
Bring the music from your amp to your speakers.
Patch cables take the music from your stereo to the amplifier. Most amp wiring kits don't include them.
Helps protect your car's charging system and improves power handling. Required power and ground wires not included with cap.
The right tools will make the installation easier.
Have your new amplifier put in by a qualified professional in your area.
Rockford Fosgate RFK8i

Rockford Fosgate RFK8i

8-gauge amplifier power and signal wiring kit

Item #: 575RFK8I

(30)

$74.99
Add to Cart
Rockford Fosgate RFK8

Rockford Fosgate RFK8

8-gauge amplifier power wiring kit

Item #: 575RFK8

(6)

$64.99
Add to Cart
T-Spec 16-gauge Speaker Wire

T-Spec 16-gauge Speaker Wire

Black/white jacket — priced per foot

Item #: 120SW16WB1

(13)

T-Spec 12-gauge Speaker Wire

T-Spec 12-gauge Speaker Wire

Black/white jacket — priced per foot

Item #: 120SW12WB1

(30)

T-Spec 2-Channel RCA Patch Cables

T-Spec 2-Channel RCA Patch Cables

Available in 7 different lengths (17-foot)

Item #: 120RCA172

(27)

$19.99
Add to Cart
EFX 17-foot RCA Patch Cable

EFX 17-foot RCA Patch Cable

Item #: 142A17C

(55)

$7.99
After $2.00 Savings Add to Cart
EFX 2-Channel RCA Patch Cables

EFX 2-Channel RCA Patch Cables

Reference Series Multi-Core RCA patch cables — available in 5 different lengths (6-foot)

Item #: 142RR6

$14.95
Add to Cart
EFX 2-Channel RCA Patch Cables

EFX 2-Channel RCA Patch Cables

Elite Series Braided Multi-Core RCA patch cables — available in 5 different lengths (12-foot)

Item #: 142RE12

$64.95
Add to Cart
EFX 2-Channel RCA Patch Cables

EFX 2-Channel RCA Patch Cables

Core Series Twisted RCA patch cables — available in 5 different lengths (3-foot)

Item #: 142RCT3B

$6.95
Add to Cart
T-Spec Capacitor

T-Spec Capacitor

1.5-farad capacitor with red LCD meter

Item #: 12015DDC

(11)

$79.99
Add to Cart
Metra Crimp Tool and Connectors

Metra Crimp Tool and Connectors

Package contains crimp tool and over 150 pieces

Item #: 120CRIMPKT

(15)

$19.99
Add to Cart
S&G Wire Cutter/Stripper Tool

S&G Wire Cutter/Stripper Tool

Cuts and strips 12- to 22-gauge wire

Item #: 18119100

(17)

$19.99
Add to Cart
S&G Tool Aid 87650

S&G Tool Aid 87650

Door Trim and Panel Removal Tool

Item #: 18187650

(71)

Pro.Fit Wire Worm

Pro.Fit Wire Worm

Installation tool helps route wiring through tight spaces

Item #: 042DM4533

(34)

$12.99
Add to Cart
Skewdriver Pro SPK4042

Skewdriver Pro SPK4042

Ratcheting straight and offset screwdriver set with 40 bits (Skewdriver Pro with ratchet handle, pictured)

Item #: 180SPK4042

(8)

$49.99
Add to Cart
Bojo Trim Panel Tools

Bojo Trim Panel Tools

Set of 6 pry tools — helps remove interior and exterior trim and door panels

Item #: 126CR6NGL

(54)

$24.99
Add to Cart
Install Bay 3320

Install Bay 3320

Auto-ranging digital multimeter

Item #: 1203320

$39.99
Add to Cart
Install Bay IB35400

Install Bay IB35400

Premium door panel and trim tool

Item #: 12035400

$15.99
Add to Cart
Bojo Trim Panel Tools

Bojo Trim Panel Tools

Set of 6 pry tools — helps remove interior and exterior trim and door panels

Item #: 126CR6LNGL

(2)

$29.99
Add to Cart
InstallCard: Amp or Equalizer

InstallCard: Amp or Equalizer

Prepaid professional amplifier or EQ installation

Item #: 597421003

(18)

$79.99
Add to Cart