|
 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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| 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) |
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