Wohler AMP1A-53-4

1U analog 4-chan audio monitor, four hi-res 53-seg level meters, hi-fi stereo speakers.


The AMP1A-53-4 audio monitor provides self-powered, full-fidelity stereo monitoring of analog audio in the smallest rack space possible (1U).

The unit features four balanced audio inputs on Phoenix connectors and a rotary knob on the front panel for selection of any two, none, or all four channels for assignment to the left and right speaker channels with visual monitoring on four 53-segment high-resolution tri-color LED bargraph display level meters.

A pair of balanced XLR connectors output the selected audio source for connection to downstream equipment.

The level meters may be adjusted for a number of parameters, including Display Mode, Peak Hold, PPM Ballistics, Alternate Scales, and Phase Correlation via rear panel and internal DIP switches.

An Auto Line Level Calibrate feature is also available.

The audio amplifier section features five high performance transducers driven by three power amplifiers: two amplifier/driver combinations handle midrange and high frequency information in stereo (left and right speakers), while the third center channel reproduces information below the 500 Hz crossover point (woofer speaker).

Output limiter circuits are incorporated to protect the speakers, and extensive magnetic shielding allows placement immediately adjacent to magnetically sensitive equipment, such as video monitors.

The unit front panel also features Wohler's' proprietary three-LED stereo phase indication feature, volume control, balance pot, power indication LED, and stereo headphone output.