Sunfire True Subwoofer Super Junior User Manual page 13

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
subwoofer's Line Level
inputs and then connect
the subwoofer's High-Pass
outputs to the inputs of
your amplifier.
The subwoofer will play
the low frequencies and
your amplifier and front
speakers will play the
frequency range above the
subwoofer's fixed high-
pass crossover point.
The signals coming out
of the subwoofer's 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
subwoofer's passive
crossover network, rather
than the active network
and controls.
User's Manual 13