Genesis I.C.E. 928 - Manual (Page 9)

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If your preamplifier has only one set of balanced outputs and one set of
unbalanced (RCA) type outputs, choose your first preference of
connection for the amplifier that is driving your main speaker. Use the
remaining set of outputs to feed the subwoofer amplifier.
Connecting only one subwoofer
If you are using only one subwoofer, connect both the left and the right
low level or high level inputs into the one Genesis 928 subwoofer. The
Genesis 928 will automatically create the appropriate mono signal.
Making your system sound right
The Genesis 928 subwoofer system is perfect for both music and
video. The setup for either is very similar and the goals should be quite
the same too. In our opinion, the end goal of adding a high end
subwoofer should be to not “hear” the subwoofer work (in a music
system), but rather to add the appropriate amount of low end that is
currently missing in your system.
With music, the full frequency range of the orchestra or rock band
should be reproduced with proper dynamic range and realism, from the
lowest notes of a pipe organ to the whack of the timpani or the pluck of
the lowest string on a Fender bass. With video, the same goals should
be sought after so the results are both realistic and exciting as the roar
of jet planes rumble through your living room and prehistoric creatures
shake the earth.
With proper setup and placement, you can achieve stunning realism,
and musically correct and natural bass.
The Controls
The G928 subwoofer has two controls that you
will be using for making your system (and that
includes the room) sound right. The first is the
gain control of the woofer amplifier. This adjusts
the volume at which the subwoofer plays. The
gain can be adjusted from 1 to 11.
The second control is the low pass filters. This
adjusts the crossover frequency for the built-in
12dB per octave variable crossover. The
crossover frequency can be adjusted from 40Hz to 138Hz, where
frequencies below the number set are sent to the subwoofer, and
frequencies above are rejected.