Aphex Model 124B 2-Channel Audio Level Interface

Aphex Model 124B 2-Channel Audio Level Interface

Aphex Model 124B 2-Channel Audio Level Interface

B&H # AP124B MFR # 124B
Aphex Model 124B 2-Channel Audio Level Interface

Aphex Model 124B 2-Channel Audio Level Interface Back View

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Product Highlights

  • Connects Consumer to Pro Level Gear
  • -10dBv to +4/+8dBm
  • 2-Way Buffer
  • Stereo RCA & XLR Inputs & Outputs
  • Line Driver & Signal Splitter Functions
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  • 1Description

The Model 124B 2-Channel Audio Level Interface from Aphex is designed to allow you to connect two channels of consumer-level, -10dBv gear to a professional-level, +4 or +8 dBm system. It provides a 2-way buffer so both systems connected can operate unaffected by the other. In addition, the 124B can also function as a line driver and a signal splitter.

Servo-balancing means that high common mode voltages, such as induced hum from a nearby AC line, are compensated for, preserving headroom. The input impedance of 100 K Ω allows bridging over a 600 Ω balanced or unbalanced line with negligible loading effects. Front panel switchable 600 Ω load allows for input line termination when required
Servo-balancing allows the outputs to be used balanced or unbalanced (single-ended) at any time by simply grounding either unused pin. The servo compensates for the voltage loss on one side so there is no 6 dB loss of level. The outputs are also protected against short-circuits, so nothing is damaged if the wrong pins are grounded. A front panel indicator will flash red when the balanced output level is 5 dB below clipping
  • Two-Way Interface Amplifier: for connecting any unbalanced device such as a cassette deck, equalizer, CD player or DAT deck to the IHF inputs and outputs. The balanced inputs and outputs go to a studio console, patchbay or other line level equipment. The different gains and impedances are matched for optimal performance
  • Line Driver: The servo-balanced input and output stages of the 124 can be used as a line driver for long lines. The output stage provides a short-circuit proof, low impedance source that will be relatively unaffected by the impedance of the cable. Gain may even be taken to boost signal level. In this application, either the unbalanced IHF or balanced high-level inputs may be used. For the latter, the IHF inputs and outputs are simply jumpered
  • Signal Splitter: The 124 may be used to provide two balanced outputs from a single unbalanced mono signal. A "Y" connector is used to split the incoming signal to each of the IHF unbalanced inputs
  • UPC: 693714012416
    In the Box
    Aphex Model 124B 2-Channel Audio Level Interface
  • Limited 2-Year Warranty
  • Table of Contents
    • 1Description
    Bandwidth 5 Hz to 100 kHz (0, -0.5dB)
    Dynamic Range 99 dB
    THD 0.005
    Channel Isolation > 70 dB
    CMRR > 45 dB (typical)
    Connectors IHF:2x RCA
    Balanced: 2x XLR 3-pin female
    Input Impedance IHF: 18 kΩ
    Balanced: 100 kΩ with front panel 600 Ω termination switch
    Input Level IHF: -10 dBV; peak 15 dBV (ref. 1 V)
    Balanced: +4 dBm (+8 dBm via internal jumpers); peak +30 dBm
    Connectors IHF: 2x RCA
    Balanced: 2x XLR 3-pin male
    Output Impedance IHF: 150 Ω
    Balanced: 65 Ω
    Output Level IHF: -10 dBV, peak +18 dBV (ref. 1 V)
    Balanced: +4 dBm front panel adjustable ± 6 dB, peak +25 dBm
    Power Requirements 100, 120, 220, OR 240 VAC, 50-60 Hz
    Dimensions (H x W x D) 1.75 x 8.25 x 7.25" (44.5 x 209.5 x 184.2 mm)
    Weight 3.5 lb (1.6 kg)
    Packaging Info
    Package Weight 4.7 lb
    Box Dimensions (LxWxH) 12.1 x 9.0 x 4.3"
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