ZAPCO ST-X Class AB Series - ST-4X SQ III

The Zapco ST-4X SQ III 4-channel amplifier from the  ST-X Class AB Series is a powerful Class AB stereo amplifier with 4x 95 watts RMS at 2 ohms. It has both a high-level and low-level input via cinch. On the connection front there are crossover settings and a variable bass boost control.

The Studio-X amplifiers feature the same high-quality  capacitors, operational amplifiers and bipolar outputs that have made Reference Series amplifiers the industry standard for sound quality.

There are six full-range amplifiers in the Studio-X series and all are Class A/B and all use bipolar output devices for the best possible sound. And all are equipped with all the features you could want. Common features of ST-X amplifiers include variable HP/LP/full-range electronic crossovers, variable bass boost, variable gain per channel pair, speaker level input, heavy-duty locking terminals, and preamp outputs that can be looped to the next amplifier in the system without the need for additional RCA cables. And the most important feature that all ST-X amplifiers have in common is legendary Zapco sound quality, developed with over 40 years of experience.

With the new Studio-X III, you get the sound quality that other companies only offer in their big competitor amplifiers (and better than many of them), in a new fan cooled aluminum heatsink for improved efficiency and reliability. Plus, numerous features are included, like 12dB/octave multi-function crossover, bass boost, variable gain, and even pass-through RCA outputs. As for performance, the Studio-X III series offers more than just power. These amplifiers have less than 0.1% THD and over 95dB SNR for multi-channel amplifiers; less than 0.1% THD and over 100dB SNR for mono amplifiers.

These amplifiers are built to last.

• 4-channel, full range, class A/B
• Tiffany style panel mount RCA
• New aluminum housing
• speaker level inputs
• Variable input gain control
• Variable electronic crossover
• Automatic switching on for speaker-level inputs
• Variable bass boost control
• New aluminum housing

• Power @ 4Ω: 4 x 70 Watt RMS
  
• Distortion factor at rated power < 0.1% Distortion factor
  
• Power @ 2Ω: 4 x 95 Watt  RMS
  
• Power bridged @ 4Ω: 2 x 190W RMS
  
• Signal-to-noise ratio > 95dB
  
• channel separation >60dB
  
• Frequency response 15Hz to 30KHz ±1dB
  
• Input sensitivity .25v to 5v
  
• Dimensions in mm: 160(W) x 58(H) x 325(L)