Hi-

You can find information on a few of the other home theater discussion forums. Here are a few places: www.hometheaterforum.com and www.hometheaterspot.com.

A particular thread that mentions it may be found here:

http://www.hometheaterforum.com/htforum/...ght=520+and+LFE

(You may have to paste that URL into your browser directly. I got there by going to www.hometheaterforum.com and doing a search on "520 and LFE" in their Receiver/Separates section).