Sunfire Subrosa SRS-210R User Manual page 16

Using the line level high-pass outputs
If you are using a preamplifier
which does not have a sub/LFE
output, you can send its left and
right front output into the line-level
inputs and then connect the sub
amplifier's high-pass outputs to
the inputs of your main amplifier.
The subwoofer will play the
low frequencies and your main
amplifier and front speakers will
play the frequency range above
the subwoofer's fixed high-pass
crossover point.
The signals coming out of the
high-pass outputs are not affected
by any of the controls. They are
just a copy of the signals going in
except that the low bass is filtered
out. This uses the sub amplifier's
passive crossover network,
rather than the active network and
controls.
This is an excellent method if
your speakers are small satel-
lites or mini-monitors, and/or your
power amplifier is of limited power,
such as a tube amp.
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User's Manual