Originally Posted by dkuster
I've read that the LFE channel (the ".1") can contain frequencies up to 120Hz, and for this reason one should leave the "subwoofer lpf for lfe" setting in the Bass Management menu set to 120Hz.
But what happens if ARC selects a subwoofer cutoff target of, say, 80Hz? Are frequencies from 80 to 120 Hz filtered out? Or does Anthem Room Correction not apply to the LFE channel?
In a related question, on the Target Customization menu, should the "subwoofer" crossover frequency always be greater than "fronts" crossover? If it isn't, doesn't that create a "hole", meaning that some of the frequencies that are redirected from the fronts to the sub will be filtered out?
I've had an interesting email exchange with Anthem tech support regarding these and related question, and I thought I'd report back here on what I've learned.
First, the "Equalization Cutoffs" in the ARC targets menu probably should have been named something else, because they really don't have anything to do with equalization. The frequencies selected here simply specify the 3dB point of the high-pass filters for L/C/R/SL/SR and the low-pass filter for the subwoofer. This is your bass management functionality.
Equalization is controlled by the "Max EQ Frequency" setting, and it applies to ALL speakers. You can see this in the curve viewer tool for a given speaker by selecting "equalization". In my case, I get good integration between my subwoofers and main speakers if I set the L/R high-pass cutoff to 90 Hz, and the subwoofer low-pass cutoff to 90Hz. But when I look at the equalization curve it's clear that room correction is being applied to the subwoofer all the way up to 300 Hz (my Max EQ Frequency) even though its response has been rolled off nearly 30dB by 200 Hz!
Then there's the "subwoofer LPF for LFE" setting in the bass management menu of the AVM60 itself. This is an independent low-pass filter for the LFE / ".1" channel only. Since it's possible to have content in the LFE channel up to 120Hz it's probably best to leave this at the default 120Hz.
So to summarize:
The subwoofer channel contains the redirected bass from the other speakers. These are the bass frequencies below the settings selected for the "Equalization Cutoffs" in the ARC software.
The subwoofer also contains the LFE content which is first low-pass filtered at the "subwoofer LPF for LFE" frequency.
As long as "Max EQ Frequency" is greater than the maximum of the "Equalization Cutoffs", and "Max EQ Frequency" is greater than "subwoofer LPF for LFE", then all subwoofer channel content will be processed by ARC room correction.