Zapco ST-204D SQ III


Features and Functions:

  • 4-Channel, Full Range, Class D
  • RCA and Speaker Level inputs
  • Variable input gain control
  • Variable electronic crossover
  • Variable bass boost control


  • Power @ 4Ω: 4 x 200 watts RMS
  • THD @ Rated Power  < 0.5%THD
  • Power @ 2Ω: 4 x 290 watts RMS
  • Power Bridged @ 4Ω: 2 x 580 W RMS
  • Signal to Noise Ratio > 90dB
  • THD + Noise < 0.1%
  • Frequency Response 15Hz to 30KHz ±1dB
  • Input Sensitivity .25v to 5v
  • Dimensions in mm: 160(W) x 58(H) x 300(L) Overall: 160(W) x 58(H) x 325(L)
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The new Class D Studio Series.

Over the last couple of years Zapco has introduced more than our pure high end SQ Competition amps. We have also introduced a line of great sounding amps in an affordable price range called the Studio series. The Studio D amps are full range Class D amps with great sound, a compact chassis, and more crystal clear power than the competition.

Thanks to a brand new technology, we are able use the NXP Class D solution to get amazing power and performance in a incredibly compact chassis with over 90% efficiency. And this diminutive little beast has all the features of the larger amps… and optional HD Bluetooth streaming! The HD Bluetooth Module (optional) is a Qualcomm CSR8675 premium tier single-chip solution with 80 MHz DSP, delivering high quality wireless audio performance over Bluetooth and aptX HD making it an ideal choice for premium audio products.


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