Zapco ST-850XMII (New Mark II) Mono Class D Amplifier

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Zapco ST-850XM II 850 watt Mono Class D Amplifer
With the ST-S amps you get all the power and sound quality you expect from Zapco. 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. The Class A/B Zapco amplifiers for mids and highs havce the same high quality caps, 5532 op-amps,and bi-polar outputs that made the C2K and Reference series amps the industry standard for sound quality. For the bass, the ST-X mono Class D amps come in 5 power levels so whether you’re running a 1Ω, 2Ω, or 4Ω load, the ST-X bass amps are the right choice for the power for the right price, for your system, in your car.
Reliability? Zapco defines reliability. It's not at all unusual to see Zapco amps moved from car to car and from generation to generation.
Features and Functions
Single channel, Class D, Bass Amplifier
Compact chassis
Variable input gain control
Variable electronic crossover
Variable subsonic filter
Variable bass boost control
Variable center frequency for bass boost
Variable phase control
Strappable to use a pair of amps on a single voice coil
Dash mount remote gain control
Power @ 1 Ohm: 1 x 850 watts
THD @ Rated Power < 0.2%
Power @ 2 ohms: 1 x 600 watts
Power @ 4 Ohms: 1 x 430 watts
Signal to Noise Ratio > 90dB
THD + Noise < 0.2%
Efficiency > 85%
Frequency Response 10Hz to 200Hz plus or minus 1dB
Input Sensitivity .25v to 5v
Dimensions in mm: 160(W) x 52(H) x 301(L)


  • Variable Bass Boost, Subsonic Filter
  • Included Dash Remote



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