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Power @ 4Ω: 4 x 50 watts
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THD @ Rated Power < 0.5%THD
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Power @ 2Ω: 4 x 80 watts
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Power Bridged @ 4Ω: 2 x 160W RMS
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Signal to Noise Ratio > 95dB
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THD + Noise < 0.5%
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Channel Separation >60dB
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Frequency Response 15Hz to 30KHz ±1dB
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Input Sensitivity .25v to 5v
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Dimensions in mm: 160(W) x 52(H) x 260(L) Overall: 160(W) x 52(H) x 302(L)
Zapco ST-4X II
4 Ch. Class AB Amplifier
The most important feature shared by all the ST-X amps is the legendary Zapco sound quality, developed with over 40 years of experience.
Description
Related products
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Helix M SIX
One for all – no matter if 3-way, 2-way or subwoofer application, the 6-channel amplifier M SIX will always be the right choice.
With generously 100 Watts RMS per channel into both 4 Ohms and 2 Ohms load this amp really gets your speaker cones going despite its super-compact dimensions. On the other hand the M SIX stays totally cool thanks to its highly efficient Class D design topology. And even bridged configurations are possible, delivering up to 3 x 200 Watts RMS of clean and undistorted output power.
In addition a comprehensive and stunningly practical feature set leaves nothing to be desired. And finally the perfect sound tuning is no big deal thanks to its integrated crossover with all its setup options. -
Helix C FOUR
Audiophile sound quality combined with impressive output power
The C FOUR is a high-end 4-channel amplifier that has been designed down to the last detail for ultimate sound quality. Audiotec Fischer’s proprietary ultra low-noise and ultra low-distortion Class A driver stage feeds a total of 32 hand-selected MOSFET power transistors, resulting in an incredible damping factor of 1,000 for relentless control of every loudspeaker. The intelligent regulation of the power supply assures stable conditions for the output stages and therefore phenomenal output power independent of the cars battery voltage.
In combination with the optionally available digital input module HDM 2, the C FOUR demonstrates the perfect transition to the digital era. The HDM 2 accepts digital audio signals up to 96 kHz sampling rate via its two optical inputs followed by cutting-edge BurrBrown D/A converters with 32 Bit resolution that transform the signals back to the analog domain. Therefore the C FOUR is absolutely future-proof and perfectly prepared for the combination with our digital signal processors. -
Helix P TWO
Plenty of power and sensitivity – the new P TWO combines two talents in an absolutely unique way. Due to its RMS output power of 2 x 490 Watts into two Ohms, this compact amplifier is able to drive even powerful subwoofers to the max. The technical design is literally predestinated for all woofers with 2 x 2 Ohms dual voice coil like the new HELIX Q subwoofers.
But despite its sheer force the P TWO is by no means a pure subwoofer amplifier. On the contrary, the Ultra HD Class D concept combines an extended frequency response above 40 kHz with high damping factor, minimal distortion and excellent signal-to-noise ratio. Therefore, this amplifier is likewise a perfect buddy for heavy-duty front speakers in audiophile system concepts.
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Helix D FOUR
The new entry into the HELIX world! The amplifiers of the D series are solely modest with respect to pricing. Everything else is thoroughly pure HELIX quality without any compromises. Loads of power, excellent measurement data and a whole bunch of features ensure a pristine and crispy sound experience!
Absolutely nothing has been missed for powerful sound reproduction – the active crossover with highpass filter, lowpass filter, bandpass and bass boost are equally as self-evident as the intelligent highlevel input that incorporates Audiotec Fischer´s proprietary ADEP circuit. It is even possible to add an optional volume remote control for the amp channels C and D which is very useful if those outputs are firing a subwoofer.
The elegant design not only states right from the beginning the amp’s heritage but also allows an easy integration into your car thanks to its compact dimensions. That is sound-tuning at its best!