Genesis I.C.E. 928 - Manual (Page 11)

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closer together in order to achieve better mid bass coupling between
the main speakers. If it sounds too “fat” turn the low pass filter down or
adjust the gain. At this point it is suggested to use the low pass filter
control until you get to the refinement stage.
Low bass
If you find that there isn’t enough deep bass, your first remedy is the
gain control on the woofer amplifier. This has several limitations. First,
turned up too high, you may get some distortion on very low
frequencies.
Secondly, you may make the mid bass produced by the top of the
woofer out of proportion with the mid bass produced by the bottom of
end of your main speakers. This would make your system sound
“boomy” in the mid bass regions.
A good rule of thumb is to first set the gain control of the subwoofer for
proper mid bass rather than low bass. The theory is, if the mid bass is
correct, then the low bass should be very close to correct. If the mid
bass is proper and the low bass is still not right, you should move your
G928 towards a corner for more wall loading. Do this in small
increments (a couple of inches at a time). It is easy, and yet
unproductive to go too far!
A good balance between proper low bass extension and a deep and
spacious soundstage needs to be established to optimize your new
speaker’s performance.
It should be noted that when you originally set up your main
loudspeakers, you most likely made placement decisions based on the
quality of imaging and proper bass levels. So now, let your new 928
subwoofers take care of the bass, and you can position your main
speakers for best imaging and tonal balance.
Fine tuning an audio or video system is an art that will take time and
patience. It can be one of the more rewarding learning experiences
you will have in the pursuit of music or video and their enjoyment.
One of the best pieces of advice we can offer is that you take
advantage of the ear’s ability to identify similarities in sound. This ability
is useful in fine tuning your system because if every recording you
listen to (or every video you watch) has a similarity of sound (too much
or too little of a certain frequency for instance) then you can be fairly
certain that you have yet to perfect your setup. Keep at it and