David, that particular setting isn't especially crucial. The LFE channel in movies extends to as high as 120Hz, but it's said that in practice little or nothing above about 80Hz(and most LFE is much lower)is mixed into it. Some want it set at 120Hz in case something useful is up there, while others would set it at 80Hz to possibly reduce some random noise in the channel. My view is that it isn't a big deal either way.

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Enjoy the music, not the equipment.