Zapco ST-4XII Class A/B 80 Watts x 4 @ 2 Ohms 4-Channel Amplifier

Model: ST-4XII UPC: 636644603484 Item: 170585


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Zapco ST-4XII Overview

Zapco’s ST-4XII 4-channel car audio amplifier mates Class A/B architecture with a 4-channel amplifier design. The result is an amplifier that can power your new speaker system and make it sound its very best.

Product Information

Product highlights

  • 4-channel system amplifier
  • 50 watts x 4 at 4 ohms
  • 80 watts x 4 at 2 ohms
  • 160 watts x 2 bridged at 4 ohms
  • Class A/B for superb sound quality
  • Variable high-pass and low-pass filters
  • Selectable bass boost (0dB, 6dB, 12dB) on rear channels (in case a subwoofer is bridged on these channels)
  • Aftermarket radio integration via pre-amp inputs
  • High-level inputs for factory-installed audio system integration
  • Auto turn-on through high-level input
  • 4-gauge power/ground inputs (power kit sold separately)
  • Product dimensions (WxHxD): 10-1/4”W x 2-1/16”H x 6-3/8”D
  • Warranty: 1 year - World Wide Stereo is an authorized dealer for every brand we sell
  • Included: World Wide Stereo 60-day guarantee and expert product support

Class A/B Throughout

Zapco opted to use Class A/B architecture throughout their 4-channel ST-4XII car audio amplifier. They did this because of the strong output and excellent sound quality that Class A/B offers in comparison to the other classes that exist. Teamed up with Zapco’s experienced sound engineers, you’re looking a finely-crafted amplifier.

Full-range Outputs on All Channels

Are you setting up a killer audio system and you’re in the market for an amplifier that delivers strong, reliable full-range power through 4 channels? Zapco’s ST-4XII amplifier is the perfect solution for you. If you end up changing the configuration of your audio system, you can simply flick some switches to engage the on-board high-pass and low-pass filters.

4/3/2-Channel Configurations

The ST-4XII allows you to configure it in a few different ways so as your system evolves, so can your amplifier. It can be hooked up in a traditional 4-channel way to power the speaker system in your car or you bridge the four speaker outputs into a 2-channel mode (at 4 ohms) to deliver stronger power to high-performance front speakers. Lastly, if you wanted to power front speakers and a small, efficient subwoofer, you’re able to do this, too, in 3-channel mode.

Looking for a different amplifier configuration? The Zapco ST-X-series is also available in a high-power 4-channel or 5-channel design.



  • Power @ 4Ω: 4 x 50 watts
  • THD @ Rated Power < 0.5%THD
  • Power @ 2Ω: 4 x 80 watts
  • Power Bridged @ 4Ω: 2 x 160W RMS
  • Signal to Noise Ratio > 90dB
  • THD + Noise < 0.5%
  • Channel Separation >60dB
  • Frequency Response 15Hz to 30KHz ±1dB
  • Input Sensitivity .25v to 5v
  • Dimensions in mm: 160(W) x 52(H) x 260(L) Overall: 160(W) x 52(H) x 302(L)

What's in the Box

What's in the Box:

  • One ST-4XII amplifier
  • Owner's manual



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Why did you choose this?
World Wide Stereo Store
Found this deal on DIYMA
Carlos L on Jun 3, 2019
Found this deal on DIYMA
Carlos L on Jun 3, 2019