The AMP1A-PLUS stereo audio monitor provides self-powered, full-fidelity stereo monitoring of analog audio in the smallest rack space possible (1U) and features two pairs of stereo audio inputs on XLR connectors and a 2-position stereo source select toggle switch for selection.

Two pairs of balanced XLR connectors output the selected audio source for connection to downstream equipment.

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 also features a volume control, balance pot, power indication LED, and stereo headphone output.

• Wohler Part Number: 8100-0320
• Rack Height: 1RU
• Weight: 14.0 LBS (6.4 KG)
• Dimensions: 1.75X19X12" (44.5X483X298 MM)
• Power Consumption: 35W
• Signals Monitored: Analog
• Analog Inputs: 4 balanced analog inputs on XLR
• Analog Outputs: 2 balanced analog outputs from selected source on XLR
• Aural Sound Outputs: Wohler speaker system;headphone, mutes speakers
• Acoustic Distortion: 8% OR LESS AT WORST CASE FREQUENCIES ABOVE 180 HZ includng cabinet resonance, typically < 2%
• Electrical Distortion: <0.15% at any level below limit threshold
• Frequency Response (1/6 octave): 80 HZ - 16 KHZ (+ OR -7 DB); (-10 DB @ 50 HZ, 22 KHZ)
• Peak Acoustic Output @ 2 feet: 98 DB SPL
• Hum and Noise: better than -68 DB below full output

• Input impedance > 40k ohms balanced
• Input level for maximum output (volume full on) 0 dB balanced
• Input overload +26 dBv balanced
• Peak acoustic output (at 2 ft.) 98 dB SPL
• Response, 6th octave 80 Hz to 16 kHz +/- 7 dB (-10 dB @ 50 Hz to 22 kHz)
• Power output RMS each side RMS base
  • 10 W transient / 5 W continuous
  • 20 W transient / 10 W continuous
• Distortion, electrical < 0.15% at any level below limit threshold
• Distortion, acoustic 8% or less at worst case frequencies above 180 kHz including cabinet resonance; typically <2%
• Hum and noise Better than -68 dB below full output
• Magnetic shielding