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Aphex 124A Level Matching Interface

Aphex 124A
Aphex 124A
 
List Price: $349.00
Our Price: $299.00
Sale Price: $199.00


Availability: Limited Stock Available
Product Code: 9999-17353

 

Aphex 124A Level Matching Interface

The Aphex 124A Level Matching Interface is designed to allow use of consumer hi-fi equipment with +4 or +8dBm professional, industrial and broadcast audio systems.

The Aphex 124A Level Matching Interface provides an extremely clean, reliable two-way buffer so both systems can operate at maximum performance levels, matching impedances and operating levels.

The Aphex 124A Level Matching Interface may be used to provide two high quality 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.

Performance

The Aphex products are well known for their audio performance. The Aphex 124A Level Matching Interface is no exception. Inputs and outputs are transformerless, for wide, flat frequency response and perfect square waves to preserve transients. Hum and noise rejection are very high while the noise and distortion are almost non-existent. The Aphex 124A Level Matching Interface is so clean it is a perfectly transparent interface for digital equipment.

Two-Way Buffering

The Aphex 124A Level Matching Interface is actively balanced and buffered in both directions, with very low output impedances. A more expensive type of balanced input circuit is used for even higher hum and noise rejection. In addition, all inputs and outputs are carefully filtered for freedom from RF interference.

Some other devices are passive in one direction, simply using resistors to lower level from +4 to -10. The passive circuitry unbalances the input, eliminates all common-mode rejection allowing for hum and noise pickup, and presents a rather high impedance at the -10 output, permitting even more noise to enter the system.

Servo-Balanced High Level Circuits

Although more complex and costly, servo-balancing has many advantages over conventional balanced circuits. On the inputs, it means that high common mode voltages, such as induced hum from a nearby AC line, are compensated for, preserving headroom that is sacrificed in other devices (balanced input overload is greater than +30dBm with common mode input voltage tolerance of over 200 volts rms). The input impedance of 100K Ohms allows bridging over 600 Ohm balanced or unbalanced line with negligible loading effects. Front panel switchable 600 Ohm load allows for input line termination when required.

On the outputs, servo-balancing means that the outputs may 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 6dB loss of level as with other systems. The outputs are also short-circuit proof, so nothing is damaged if the wrong pins are grounded. Output impedance is very low so long lines are driven effortlessly. A front panel indicator will flash red when the balanced output level is 5dB below clipping.

Applications

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 Aphex 124A Level Matching Interface can be used as a very effective 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 Aphex 124A Level Matching Interface may be used to provide two high quality 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.

IHF Distribution Amp

The very low output impedance of the Aphex 124A Level Matching Interface allows it to drive a considerable number of unbalanced devices such as cassette decks, VTR's, power amps, etc. Balanced or unbalanced inputs can be selected by patching the various inputs and outputs.

Compact Package

The Aphex 124A Level Matching Interface is housed in an all metal package which is compact and self-powered. It may be attached to its dedicated piece of equipment; rack mounted singly or in pairs using the optional rack mounting kit.

Aphex 124A Level Matching Interface Features

  • Matches Consumer IHF equipment to Professional Equipment
  • Dual Buffered Interface
  • Transformerless Outputs
  • Servo-Balanced Inputs and Outputs
  • Recessed Controls
  • Pushbutton 600 Ohm Input Termination
  • Clip Indicator
  • Self Powered
  • Superb Signal Quality

Aphex 124A Level Matching Interface Specifications

  • Audio:
    • Bandwidth: 5Hz - 100 kHz (+0, -0.5dB)
    • Dynamic Range: 99 dB
    • THD: 0.005
    • Channel Isolation: > 70dB
    • CMRR (typical): > 45 dB
  • Input:
    • IHF Input Connectors: RCA Jacks
    • IHF Input Impedance: 18 k Ohms
    • IHF Input Level: -10 dBV; peak +15dBV (ref. 1V)
    • Balanced Input Connectors: XLR 3-pin Female
    • Balanced Input Impedance: 100k Ohms with front panel 600 ohm termination switch
    • Balanced Input Level: +4 dBm (+8dBm via internal jumpers); peak +30 dBm
  • Outputs:
    • IHF Output Connectors: RCA Jacks
    • IHF Output Impedance: 150 Ohms
    • IHF Output Level: -10 dBV, peak +18dBV (ref. 1V)
    • Balanced Output Connectors: XLR 3-pin Male
    • Balanced Output Impedance: 65 ohms
    • Balanced Output Level: +4dBm Front panel adjustable 6dB, peak +25dBm
  • 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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