Following up on my earlier post about setting up the Rel R528 sub with Audyssey, here's what the tech from Rel suggested:
So here's what you do firstly unplug the high level and set the volume on the REL to about 11oclock and plug it into the LFE only.
Now run the room correction , then check the setting they speakers should be set to large and the sub should be set to LFE only with the crossover set to 200htz giving the DOLBY DIGITAL filter the ability to take what it needs from the LFE signal .
Now manually follow the instructions in the manual to set up the high level connection .
You are now ready to rock , the LFE is doing what it needs to do and the high level is underpinning the speakers giving them that natural extended bass.
I'm still confused by this. 200Hz crossover???
The Tech from REL is both confused and using the wrong terminology.
Before running Audyssey, plug the pre/pro's subwoofer output into the sub's LFE input. This bypasses the Low Pass Filter built into the sub. Audyssey's calibration ignores whatever speaker settings you've set in the pre/pro. When Audyssey is finished, it informs the pre/pro's own code where the F3 point is for each of the speakers. If it's "low enough" the pre/pro's own code (NOT Audyssey!) sets them as "Large" i.e. it disables bass management for speakers which have a reasonably good low frequency response. In spite of this, you need to manually change them all to "Small", which enables bass management for them. You also should raise (never lower) the crossover frequency for each of the speakers to at least 80Hz. (Neither of these changes affects Audyssey.) Some people have found that higher crossover settings sound better because they have a quality subwoofer. How high you set the crossover frequencies for the various speakers depends both on the relative quality of the subwoofer and the woofers built into the speakers in that frequency range and on how sensitive your hearing is for localizing the directions of low frequency sounds. 200Hz is rather high. Most people can't determine where frequencies below 80Hz are coming from, so redirecting those low frequencies to a single quality subwoofer is the right thing to do. Above about 80 Hz, though, most people can tell where the sound is coming from.
I don't know why he thinks Dolby Digital would be "taking from" the LFE channel. The Low Frequency Effects channel is a completely separate audio channel provided by Dolby Digital (and DTS). You do need to let all of the frequencies in the LFE channel get to the subwoofer, though. Maybe that's what he was trying to say (raise the subwoofer's LPF filter to 200 Hz or whatever its max is) , but if you use the LFE input on the sub, that's what you're already doing, since that input bypasses the sub's LPF (Low Pass Filter). Also, many people do confuse the terminology, using the term "LFE" when they really mean "subwoofer".