The use of close tolerance (0.1%) components in the transformerless differential input design ensures high common mode rejection performance. A high efficiency headphone driver produces maximum output from the 9 volt supply while keeping quiescent power consumption to a minimum for extended battery life. An external DC input socket allows for mains operation from a standard 9 volt adaptor. The high input impedance provided is intended to bridge and not terminate the monitored line thus minimising any loading effects. Extensive filtering of the audio lines and comprehensive screening provides excellent protection from radio frequency interference.
The high performance of the unit offers a quality stereo headphone monitoring facility suitable for portable or permanent installation in educational, live music recording, multimedia, public address and industrial situations.
The headphones are plugged into the 0.25 inch jack socket although a wide range of adaptors are readily available for use with alternative connectors. The socket is wired for use with standard stereo 3 pole plugs and a 2 pole plug should never be used. The volume is adjusted by way of the rotary control mounted on the top of the box.
The front panel mono/stereo slide switch can be used to combine the left and right inputs resulting in an identical mono output signal to each of the stereo headphone ear pieces.
The versatility of the Stereo Headphone Amplifier Box means that it can be used as a general purpose test instrument for tracing line faults or for quick operational checks. The high input signal level capability means that even speaker lines up to about 50 watts nominal power level can be monitored without danger of hearing damage by overdriving the headphones.
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Stereo Headphone Amplifier Box Specifications
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