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Emlyn wrote: »

The high level inputs allow the main L/R speakers (or any others) to take advantage of the filter in the connected subwoofers with the speakers set to large rather than small in the receiver/preamp. The LFE inputs in the subwoofers are only active with LFE content (the .1 in 5.1 or 7.1) for movie or multichannel audio soundtracks.

Ditto!

It was very interesting setting up the one 7x for the center speaker. For this application the high level is used, no LFE. I set the level in the AVR using pink noise to 75db so it was level matched with the other speakers. Now I had to adjust the high level by ear. The XO & gain adjustments were instantly audible in the sound. It went from thin sounding to too beefy. Even the slightest adjustment made a difference. After about 20 minutes of tinkering everything fell into place beautifully. The center now sounds like a full range speaker & makes a remarkable difference in the front sound stage compared to its previous setting of small & XO set to 80hz.

I'm curious if other manuf. allow for both high level & .1 LFE to be run simultaneously. My previous VELO SPL 1200R subs has both connections but the manual was very specific in stating DO NOT use both together, it was one or the other.

The single S812 in my two channel system is set up to be subtle and blend. My separate home theater system takes advantage of the ability of my S510 pair to have the speaker leavel connections and the LFE connections. Now I'm getting tempted to add a third but smaller subwoofer for the center channel speaker just using speaker level connections.