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Originally Posted by Bobby Copeland
Thank you for clearing that up, Brent. I suppose I will leave it at 120Hz.
You say Jim is talking about the speaker crossover; he says this, though, about the "LPF":
"If you have a high quality set of mids, I would recommend setting the subs LPF a little lower, as using 120Hz may make a great sub sound a little loose and sloppy."
...so it seemed like it was suggesting I should use something UNDER 120Hz on the LPF setting of the Onkyo...
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Since you started with "low pass filter"', it's a typical response to assume someone is talking about the main-sub crossover point for redirected bass when they have a question that includes LPF and a question about setting it. Only someone who's used a recent Onkyo and run into the "LPF of LFE" option (or read some of the posts and confusion it has generated at various forums) will recognize that your post is not the normal "where do I set my crossover" question.
The LPF of LFE has been discussed at length in the 705/805 threads at AVS. One of the principals at Audyssey tried to get Onkyo not to even give the user the LPF of LFE option because they recognized the confusion it would generate. Of course, they also tried to get Onkyo not to set speakers as full range just because their -3dB point was below 80hz, but that didn't work either.
To add insult to injury, Onkyo defaults the LPF of LFE to 80hz (and includes the THX logo with that choice on the 805 suggesting some official endorsement). While I'vre read that audio mixers *generally* limit the LFE channel to <80hz content, they don't technically have to. While it's not likely to be much, I'd prefer not to lose 1/2 octave of material that *could* be there. If you set the LPF of LFE to less than 120hz, this will simply throw away content above the frequency you select. It's not the same thing as redirected bass, which is what you're dealing with when you set the main-sub crossover frequencies.
-Brent