Aphex 120B 1 Input 4 Output Audio Distribution Amplifier


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Dale #:APHE-120B

Availability: In Stock

Available for immediate shipment and pick-up from our Jamaica, New York location. In-store pick-up is available Monday through Friday from 8:30 am to 5:30 pm
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  • Model 120B is a high performance audio distribution amplifier with a single high impedance input and four low impedance outputs, all electronically servo-balanced and designed to be as transparent as possible. The 120's transformerless circuits are designed for wide, flat frequency response, free from ringing or overshoot, making it ideal for distribution of time code or audio. Each output has its own amplifier and level control for maximum versatility and isolation. The sturdy steel chassis may be used stand-alone or rackmounted, singly or in pairs.

    The input circuit is adjusted for optimal common-mode rejection. Servo-balancing compensates for high common-mode voltages, so headroom isn&'t sacrificed. The high input impedance allows bridging of the input signal with minimum loading. This way several amplifiers can be easily driven from the source.

    The individual output amplifiers are very low impedance so long lines and capacitive loads are easily driven with no loss of stability or high frequency response. Servo-balancing permits the outputs to be used single-ended at any time without a change in gain by simply grounding the unused pin. Individual output level controls are recessed for bump-proof operation, yet can be easily adjusted without tools. The front panel power LED also acts as a signal present and clip indicator for the input.


    • 1 input/4 output with output trim adjustments
    • Transformerless design for wide, flat frequency response
    • Works for audio or time code
  • Frequency Response 5Hz – 100 kHz (+0, -0.5dB)
    Dynamic Range 94 dB
    Hum and Noise Better than -90 dBm at unity gain
    THD 0.002% @ +4dBm, 0.005% @ +20dBm
    IMD 0.002% @ +10dBm
    Channel Isolation 70dB
    Slew Rate 13 V/usec
    Connector XLR 3-pin Female
    Type Transformerless, differential servo balanced
    Impedance 100k ohms balanced
    Maximum Level +25 dBm
    CMRR (typical) > 45 dB
    Connector XLR 3-pin Male
    Impedance 65 ohms
    Maximum Level +25dBm into 600 ohms balanced, +21dBm unbalanced
    Output Gain Range ±15 dB
    Power Requirements 100, 120, 220, OR 240 VAC, 50-60Hz
    Dimensions 1.75 H x 8.25 W x 7.25 D (44.5mm x 209.5mm x 184.2mm)
    Net Weight 3.5 lbs (1.6 kg)
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