Genesis I.C.E. 12t - Manual (Page 14)

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Tuning for Low Frequency Effects (LFE)
The LFE input has a separate gain structure and bypasses the
crossover in the subwoofer. Hence, it should be set-up separately from
the main speaker augmentation function.
A simple way to set up the S2/12t for LFE is to use the test and level
signal available in most home theater processors and multi-channel
players, and test discs. Many DVD’s include a THX calibration option
that has a set of test tones for speaker level adjustment.
Using a high quality sound pressure meter, set the LFE gain so that
the S2/12t matches the volume of the main speakers.
If you are using multiple subwoofers, you will need to set each
subwoofer in turn. As each location of the subwoofer may have
different bass levels caused by room-related gain, adjust each
separately. To do this, you first set the LFE gain on all your subwoofers
to 1 (fully anti-clockwise).
Then, using a LFE test tone and a sound pressure meter set the LFE
gain on the first subwoofer to 3dB down (for 3 subwoofers, 5dB down if
using 5 subwoofers) from the reference volume of the main speakers.
Write down the setting, and then turn the LFE gain back to zero.
Go to the next subwoofer and repeat the process until you have the
LFE GAIN settings of all your subwoofers. When you have all the
settings, go to each subwoofer and turn up the LFE GAIN to the setting
you noted down. Re-check the bass volume with all subwoofers on.
If the bass response is too high or too low, use the subwoofer level
setting on the processor to match the LFE volume to the volume of the
rest of the speakers – or do it all again using a higher or lower setting
for each subwoofer.