David, the separate LFE channel(this isn't bass redirected from "small" speakers)theoretically goes up to 120Hz, but in practice little or nothing useful is present over about 80Hz and most is much lower. Whether to set the LFE low-pass at 80Hz or 120Hz isn't really critical. Some want to set 120 in case something useful might be up there, others want to set 80 to mnimize any noise content that might be near 120Hz. I'd suggest 80Hz.

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Enjoy the music, not the equipment.