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The ARX ZA 5:1 power amplifier has been designed specifically to meet the ever-increasing demand for high quality surround sound amplification, especially in the demanding corporate A/V market.
Channels 1 through 5 each deliver 100 watts @ 4 ohms, while Channel 6 offers a high current output of 240 watts @ 4 ohms for the most demanding sub-woofer applications.
Channel 6 features its own fully independent power supply to eliminate Low Frequency power modulation of Channels 1 - 5, a common design flaw in lesser surround amplifiers, and ensures that ample high level Low Frequency amplification is always available.

New Technology Inside
In the ZA 5:1, ARX design engineers have chosen a conventional toroidal transformer based Linear Power Supply and new ‘state of the art’ Power Amplifier Integrated Circuits, offering unprecedented amplifier and load protection.

This is coupled with our ‘Headroom Enhance’ circuitry based on our core ISC error correction technology. ISC (Interactive System Control) was developed by ARX for our range of Concert Series Loudspeaker Processors, and is now incorporated into all our Power Amplifiers and the SPL range of Integrated Powered Loudspeakers. It provides maximum power output levels under all AC mains supply voltages and rated load conditions, eliminating Output Stage clipping.

Comprehensive Protection circuitry onboard
Over the years ARX engineers have done intensive research into amplifier protection systems. The ZA 5:1 has a re-settable High Current switched protection circuit that instantly disconnect the speakers when a potentially damaging signal is detected.
New Input delay muting circuitry eliminates switch on/switch off noise.

Safety First
The outputs are all fully isolated Speakon connectors, in keeping with all current Worldwide approval requirements for amplifier output connections. There are no bare Input or Output terminals, or low cost ‘push terminals’ used on this Professional product

Rear panel accessible multi turn level controls make the ZA51 ideal for installation applications where tamper-proof operation is required, the VR version features
Note that the amplifiers are shipped with the level controls set at full on (no attenuation). Care should be taken setting initial levels during system turn on!

Built to Last
Designed from the ground up using extensive computer modelling and a compact, efficient toroidal transformer, the ZA 5:1 has been designed to satisfy the most demanding professional applications. It is a distillation of our experience gained through years of making compact, powerful amplifiers.