If you're into great sound, you'll love Kicker's ZX series amplifiers. These high-end amps set the standard for powerful sound, with a distinctive look that'll make your installation stand apart from the crowd.

The ZX350.4 4-channel amp will drive your speakers with 60 watts per channel. No inflated "peak power" ratings here — you can trust that this amp's CEA-2006 compliant rating reflects a true measure of its capabilities. Efficient heat sinks and rugged internal components ensure reliable operation and clean power output when the volume is cranked.

The built-in variable frequency filters adjust the amp's output to get the most out of your speaker setup, whether you're running full-range speakers or subs. Use the bass boost control to dial in the exact amount of low-end bump you're looking for.

Product Highlights:

  • 4-channel car amplifier
  • 60 watts RMS x 4 at 4 ohms (90 watts RMS x 4 at 2 ohms)
  • 175 watts RMS x 2 in bridged mode (4-ohm stable in bridged mode)
  • variable high- and low-pass filters (50-200 Hz, 12 dB per octave)
  • variable bass boost (0-18 dB at 40 Hz)
  • top-mounted controls
  • CEA-2006 compliant
  • speaker- and preamp-level inputs
  • fuse rating: 20A x 2
  • 8-gauge power and ground leads recommended — wiring and hardware not included with amplifier
  • 13-1/2"W x 2-5/16"H x 9-5/8"D
  • warranty: 2 years
  • 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

  • 4-Channel amplifier with two 20-amp fuses in chassis
  • 2 Spare 20-amp fuses
  • Two 4-wire Molex harnesses for speaker-level input connection
  • 4 Self-tapping mounting screws (Length=3/4")
  • 3mm Allen wrench
  • Owner's Manual
  • Product Registration Card (return for free Kicker decal and catalog)
  • Certified Power certificate

Product Research

Features
Controls
Inputs and Outputs

Features

Terminology: Although the ZX350.4 is a 4-channel amplifier, Kicker uses the terminology of "Amp 1" and "Amp 2" to indicate the channels.

CEA 2006 Compliant: The ZX350.4's power ratings are measured according to the strict standards dictated by the Consumer Electronics Association (CEA). These standards allow you to accurately compare the rated power output of all CEA 2006-compliant amplifiers, even if they come from different brands. Manufacturers who adhere to the standards can display the CEA 2006 logo on their products and packaging.

Kicker "Living Loud" Certified Power Certificate: The amplifier comes with a certificate that indicates the total maximum wattage of the particular amplifier, along with the model number, serial number, tested date, and whether the amplifier passed the total harmonic distortion, signal-to-noise ratio, and protection circuit tests.

Speaker-level Inputs: Two high-level input connections are included to allow use with sources that do not have RCA preamp level outputs. If only one set of high level inputs is being used, you can send the signal to all four channels when the Fader button on the end of the amp is pushed out. Only one type of input signal (speaker-level or line-level) should be used with this amplifier.

Built-in Variable Electronic Crossovers: The amp features two independently-controlled crossovers that allow you to select high-pass for satellite speakers, low-pass for subwoofers, or bypass for full-range operation. The crossover frequency is variable from 50 to 200Hz.

KickEQ Bass Boost: The two KickEQ bass boost circuits provide up to 18dB signal boost at 40Hz.

Fader Button: The unit has a Fader button which gives you control of the output of the amplifier. If you are using two sets of line-level or speaker-level inputs, the Fader button should be pushed in so the receiver's fader control will operate properly. If only one set of inputs is being used, the Fader button should be pushed out so the signal can be sent to all four of the amplifier's channels.

SORT (Short circuit, Over-voltage, Reverse polarity, Thermal) Protection Circuitry: The SORT protection circuitry guards against accidents and undesired operation. The Power LED on the left side of the amp glows green and the power indicator on top of the amp glows red when the amplifier is connected correctly and SORT has not been engaged. If the red Protection LED illuminates, SORT has been engaged and the amplifier is in protect mode until the problem is resolved.

Stereo Bridged Operation: You can operate the ZX350.4 in a stereo bridged operation, with one amp driving two full-range speakers and the other amp bridged to drive a single 4-ohm subwoofer. This is also referred to as "3-channel" mode.

Controls

Top of Amplifier:

  • Amp 2 Controls:
    • KickEQ Bass Boost Control: rotary control, boosts the bass at 40Hz from 0 to +18dB
    • Gain Control: rotary input gain control
    • Variable Crossover Frequency Control: adjustable from 50-200Hz
  • Amp 1 Controls:
    • KickEQ Bass Boost Control: rotary control, boosts the bass at 40Hz from 0 to +18dB
    • Gain Control: rotary input gain control
    • Variable Crossover Frequency Control: adjustable from 50-200Hz

Right Side of Amplifier:

  • Amp 1 Crossover Mode Switch: Off, Hi, or Lo
  • Amp 2 Crossover Mode Switch: Off, Hi, or Lo
  • Fader Button: Pushed in when 2 sets of inputs used, Pushed out when only 1 set of inputs used

Inputs and Outputs

Left Side of Amplifier:

  • 12+ (power): gold-plated set screw terminal (accepts up to 4 gauge wire)
  • REM (remote turn-on): gold-plated set screw terminal (accepts up to 8 gauge wire)
  • GND (ground): gold-plated screw set terminal (accepts up to 4 gauge wire)
  • Fuse: two 20-amp fuses

Right Side of Amplifier:

  • Amp 1 Speaker Output: gold-plated set screw terminals for 2 speakers (accepts up to 8 gauge wire)
  • Amp 1 High Level Input: Molex plug input for included harness
  • Amp 2 High Level Input: Molex plug input for included harness
  • Amp 1 RCA Input: gold-plated RCA line input jacks
  • Amp 2 RCA Input: gold-plated RCA line input jacks
  • Amp 2 Speaker Output: gold-plated set screw terminal for 2 speakers (accepts up to 8 gauge wire)

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.

Kicker ZX350.4 Reviews

Average Customer Review:

3 reviews
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Kicker ZX350.4

Written By Charles, West Palm Beach, Fla on Thursday, January 17, 2008

Crutchfield Customer Review (What's this?)

I use this Kicker zx 350 to push my Infinity mids and hi's and a Kicker 1200 on my Kicker subs it does awsome job. You will be satisfied with this amp

This amp would be good for smaller speakers but not power hungry compo

Written By SHAWN, Honolulu, HI on Wednesday, January 02, 2008

Bought this amp and currently have it connected to a set of Infinity Kappa Perfect 6.1 Components. While tuning the amp, i turned my volume up around 75% on the head unit and the gain setting half way up. The amp started to turn off then back on when i lowered the volume. The only thing i can think of that's causing this is that the amp is at its limit and does not have enough power for these speakers, thus going into protection mode. With 8-gauge wiring, the amp reads 14v at the power and ground terminals and 12v at the remote terminal. Overall, the amp does make everything sound crisp, but i can't see how i can only have the gain at a quarter of the way. Anything higher than a quarter will cause the amp to turn off when you crank up the volume. I'll be taking this amp back shortly.

Lots Of Power!!!

Written By Justin, Islip on Monday, April 24, 2006

Even with the gain down the speakers are loud and clear....Im running two kicker 6x9's and kicker 5.25's, and the amp makes the 3 way design(6x9's) for the mids sound amazing!!! Between the highs on the 5.25's and the mids and highs from my 6x9's it matches the power of my subs beautifuly and I love the way it sounds. No alternator hissing or anything. Very easy to install! Amp manages to keep cool also...

Get everything you’ll need to enjoy your new Kicker ZX350.4

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.
T-Spec 12-gauge Speaker Wire

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T-Spec 2-Channel RCA Patch Cables

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EFX 17-foot RCA Patch Cable

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EFX 2-Channel RCA Patch Cables

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EFX 2-Channel RCA Patch Cables

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EFX 2-Channel RCA Patch Cables

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

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T-Spec Capacitor

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