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 prefader
insert point for conversion of MS stereo microphone configurations to
AB, or for converting AB (left and right) to MS (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 reconverts
the MS signal to reestablish 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 multiturn 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 RackPanel. 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) 


