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Sum & Diff Pak

The Alice Sum & Diff Pak converts left and right line level signals to Sum & Difference, or will convert Sum & Difference signals to left and right. Primary uses include connection to mixer pre-fader insert point for conversion of M-S stereo microphone configurations to A-B, or for converting A-B (left and right) to M-S (Sum & Difference) to feed tape recorders, land lines and satellite links or any stereo circuit where phase errors may occur. A similar unit at the receive end re-converts the M-S signal to re-establish the left and right signal. Phase errors, critical when compatible mono is derived, are converted into a reduction of stereo width, which is far less objectionable than the loss or even complete cancellation of the phase shifted frequencies. A complete 180 reversal of phase, common in outside broadcast circuits, results in a reversal of the stereo image rather than complete cancellation of central mono signals. Output gain is adjustable via accessible multi-turn presets.

Housed in a convenient 1U aluminum case, the Sum & Diff Pak can be free standing, easily mounted into a woodwork system, or fitted into a rack with use of the Alice Rack-Panel. Audio inputs and outputs are via Neutrik XLR connectors and mains input is via an IEC.

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Technical Specification
Inputs impedance: 20k ohms balanced
Frequency response: 20Hz to 20kHz 0.2dB
Common mode rejection: >60dB
Noise: -100dB (ref +8dBu)
Distortion (THD): <0.005% (1kHz +8dBu input)
Max input level: +25dBu
Output Gain: -10 to +20dB
Output impedance: <1 ohm balanced and floating
Max output level: +25dBu
Mains voltage specification: 230v AC 50Hz 3VA (115v available to order)
Dimensions (mm): 254(w) x 113(d) x 52(h)
Weight (boxed): 1.10kg
  (0dBu = 0.775 volts RMS)