Originally Posted by Macfan424
Thanks for your thoughts, although I was responding to another's question, not ruminating about my own situation.
FWIW, I wound up using a very unconventional solution for my own surrounds. I don't offer it as a suggestion for others, but it is one that turned out to be ideally suited to my rather peculiar room arrangement. I installed a pair of Mirage OS2-FS's, which, to my surprise and delight, blend beautifully with my STS's. (The dealer's 30 day return privilege allowed my to try them in my room rather than speculate on the theoretical benefits and/or pitfalls of mixing or matching brands.) After running my Pioneer AVR's MCACC, they even passed the demanding pink noise test with flying colors, better than my Mythos Three center, in fact.
My limited placement options obviated any advantage that an exact match might have for SACD's. (My room is an acoustical nightmare on almost all counts.) Besides, I wasn't too concerned about designing my system around my 30-40 SACD's, only a few of which use the back channels for anything other than ambience. And for ambience, the Mirage's are unsurpassed, while still delivering an adequate amount of directionality.
Getting them dirt cheap (closeout) didn't hurt either.
I think that it's cool you got such a good blend with the Mirages in your room.
I do feel (and it's just my opinion) that your last comment about the back channels is telling.
Although the "right" solution (as I advocated in my post above and what I did in my own system) is to have identical drivers all around, it's obviously perfectly possible to get a pleasing surround experience with speakers that don't completely match because most sources just don't drive the rears anywhere close to full range.
Plus, (and this is clearly heresy) I was sitting in a crowd at a noisy show at an arena and realized that the ambient noise clearly had a totally different timbre depending on where and how far it was coming from relative to my position.
Therefore, although the pink noise test clearly indicates a match between the speakers (and is the recognized ideal), as long as the speakers are level matched and relatively similar, I suspect that the average listener would still feel the surround field was acceptable while watching movies because 1) our brains are used to the varying qualities of ambient noise and 2) few of us know what many things that happen in movies sound like in real life.
Finally, although the advice to try to get identical drivers/tweeters remains sound, most of the time, we ignore the room's contribution as well (i.e., an identical speaker won't sound the same in various positions around the room in most real-world rooms). Your experience illustrates what intelligent auditioning and competent equalization can do.
Sorry for getting off topic--