Zapco ST-4X SQ



  • Power @ 4Ω: 4 x 65 watts
  • THD @ Rated Power < 0.5% THD
  • Power @ 2Ω: 4 x 95 watts
  • Power Bridged @ 4Ω: 2 x 190W RMS
  • Signal to Noise Ratio > 90dB
  • THD + Noise < 0.2%
  • Channel Separation >60dB
  • Frequency Response 15Hz to 30KHz ±1dB
  • Input Sensitivity .25v to 5v
  • Dimensions in mm: 160(W) x 52(H) x 282(L) Overall: 160(W) x 52(H) x 320(L)


The ST-X Series. Class A/B and D Amplifiers.


The Studio-X line of amplifiers from Zapco was designed specifically for today’s car audio market. The Studio-X compact chassis makes it an easy fit in any car and even in motorcycle fairings.
The square, low profile chassis also means it will be easy to trim out for a great looking installation so your system will look as awesome as it sounds. And speaking of sound…This is a Zapco amplifier and sound is what it’s all about. These are Class A/B Zapco amplifiers.
The Studio-X have the same high quality caps, op-amps, and bi-polar outputs that made the C2K and Reference series amps the industry standard for sound quality.
Reliability? Zapco defines reliability. It’s not at all unusual to see Zapco amps moved from car to car and from generation to generation. Zapco Amps produced in the ‘90 are still being traded and bought on the internet by sound quality fans world wide. The Studio-x will be no different. These amps are built to last. See the Studio-X amps at a dealer today.

Studio-X Class A/B Full Range Amplifiers

There are six full range amplifiers in the Studio-X series and all are Class A/B and all use
bi-polar output devices for the smoothest possible sound. And, all are packed with all those features you want. Common features of the ST-X amplifiers include variable HP/LP/ Full Range electronic crossovers, variable bass boost, variable gain by channel pair, speaker level input, heavy duty positive lock terminal blocks and preamp outputs to daisy chain out to the next amp in your system without having to add more RCA cables. And the most important feature shared by all the ST-X amps is the legendary Zapco sound quality, developed with over 40 years of experience.

we have created the ST-4X SQ for the customer who appreciates the finer points of the music and wants to invest a little extra for a more “live” sound. We did this by upgrading the caps and op-amps and making few other changes. The SQ version will have a more open sound and a more precise sound stage. We also used Tiffany style panel mount RCA connectors on the ST-4SQ for a solid signal transfer.


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