[quote=davekro I just place my Bic V52's (M2 size and sim. specs) on the 8' stands (instead of the tilted QS8s) AND tilted my wall mounted QS8's down 25º (instaed of being mounted flat w/ t-brkt). [/quote]

A bit of a change to the x-overs set by the 1909 after getting the roll off freq's from Audyssey.
1) SL/SR from 90Hz to 110Hz
It seems being flush mounted yields a little lower freq. with the QS8s. The decision to tilt or not seems between a theoretical aiming advantage (tilted) vs. an actual lower freq. (20Hz. flat mounted in this test).

2) SBL/SBR from (QS8s tilted) 150Hz to (M2 'type' BShelf) 120Hz
30Hz lower freq. from the bookshelf than the QS8 mounted in the same position (mid ceiling) and tilted a similar amount.

I will listen to the system this way for a while to see if I can tell a difference between the back Qs and bookshelfs.
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Last edited by davekro; 04/15/09 11:43 PM. Reason: add pictures
Dave

"In theory, practice and theory are the same. In practice they're not."