Wisdom Audio Series SCS - Manual (Page 15)

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Caution! Always turn off the main power and wait a few seconds for the
power supply to discharge before changing the position of the
polarity switch.
If you are in doubt as to which position (0° or 180°) is the correct one for
your system, play some material with significant energy at and around
your chosen crossover frequency. Pink noise will also work. Then listen to
the system with both the SCS and the main speakers playing. The position
with more energy at the chosen crossover region (e.g., the position that
sounds louder or more “full”) is the correct position.
3. Balanced (XLR) Inputs
Three XLR input connectors are provided, as follows:
SSP/Direct • : for use with a surround sound processor/preamplifier. This
input bypasses both the internal crossover and level control of the
SCS, since both of these functions are handled by the SSP.
Left & Right • : for use in systems that lack any bass management (as
would be provided by a surround processor). For example, you can
run the Left and Right outputs of a traditional stereo preamplifier into
these inputs, and then set the crossover frequency and subwoofer
level on the SCS itself. If your preamplifier does not have multiple
outputs, use a Y-adapter to send the same full-range signal to both the
SCS and the power amplifier for the main speakers.
Balanced interconnects are less susceptible to picking up noise than are
single-ended interconnects. As such, if your system gives you the choice
of using either balanced or single-ended connections, the balanced (XLR)
connections are preferred.
4. Single-Ended (RCA) Inputs
Three RCA input connectors are provided, as follows:
SSP/Direct • : for use with a surround sound processor/preamplifier. This
input bypasses both the internal crossover and level control of the
SCS, since both of these functions are handled by the SSP.
Left & Right • : for use in systems that lack any bass management (as
would be provided by a surround processor). For example, you can
run the Left and Right outputs of a traditional stereo preamplifier into
these inputs, and then set the crossover frequency and subwoofer
level on the SCS itself. If your preamplifier does not have multiple
outputs, use a Y-adapter to send the same full-range signal to both the
SCS and the power amplifier for the main speakers.
5. Crossover Frequency Control
When using the Left and Right inputs, this flush-mounted control adjusts
the crossover frequency of the low pass filter in the SCS between 50-80
Hz. Use it to establish a smooth transition from the SCS to your main
speakers.