14
During calibration, the Left input (in the top left corner as seen from
behind the unit) is also used by your installer for connecting the output of
the calibrated microphone that measures the room’s response.
Caution!
Do not connect the calibrated microphone to the Left input input
of the SC-1 until instructed to do so a part of the MultEQ® Pro
software application.
Doing so before completing the Product Selection screen as part
of the MultEQ Pro application (see Product Selection, page 31)
will cause microphone feedback at levels that could damage the
speakers.
Using single-ended preamplifiers
If your preamplifier/processor does not have balanced outputs, the adapter
used to convert from balanced to single-ended should tie Pin 1 and Pin 3
(the inverted signal) together. This can easily be checked with an ohmme-
ter: the impedance between Pin 1 and Pin 3 should approach zero. Note
that the most suitable adapter on the input side of the SC-1 is different
than the appropriate adapter on the output side, due to the SC-1’s high
input impedance. Should you need them, properly wired adapters are
available from Wisdom Audio for a nominal charge.
2
7 Channel High (Planar) Output
These seven balanced audio outputs carry the room-corrected “high pass”
portion of the audio spectrum, and must be connected to the amplifiers
that drive the planar magnetic panels.
The pin assignments of this XLR-type male output connector are:
2
1
3
Pin 1: Chassis ground
Pin 2: (non-inverting)
Pin 3: Signal – (inverting)
Connector ground lug: chassis ground
These pin assignments are consistent with the standards adopted by the
Audio Engineering Society. Refer to the operating manual of your power
amplifier to verify that the pin assignments of its input connectors cor-
respond to your Wisdom Audio SC-1. If not, wire the cables so that the
appropriate output pin connects to the equivalent input pin, in order to
preserve the polarity of the musical signal.
Using single-ended amplifiers
If your power amplifier does not have balanced inputs, the adapter used
to convert from balanced to single-ended must “float” Pin 3 (the inverted
signal). This can easily be checked with an ohmmeter: the impedance be-
tween Pin 3 and either the center pin or the shield skirt on the RCA should
be infinite. Tying the output of Pin 3 to ground (as many adapters do) will
compromise the performance of the SC-1, due to its low output imped-
ance. Note that the most suitable adapter on the input side of the SC-1 is
different than the appropriate adapter on the output side, due to the SC-1’s
low output impedance. Should you need them, properly wired adapters
are available from Wisdom Audio for a nominal charge, or they can be
purchased online at
