Received my RBH setup yesterday, and wanted to post a few quick thoughts (note that I haven't had a chance to re-calibrate or experiment with any toe-in position options).
My set-up is now:
JL Audio Fathom 113 and M&K MX-100 subwoofers
This replaced this:
DefTech Mythos ST L/R
DefTech CLR 2500
DefTech BPVX/P Side
DefTech BPVX Rear
JL Audio Fathom 113 and DefTech SuperCube 1 subwoofers
The DefTechs are not at all a poor set-up, so they wouldn't be pushover's to the RBH's. One aspect I noticed right away was the DefTechs are more efficient, so I was running my volume knob a bit higher for similar playback levels (again, though, I haven't calibrated a thing yet)
I listened to some multichannel music - Porcupine Tree's Arriving Somewhere DVD and an MHD channel DVR recording of the Dave Matthews band.
Ignoring the imbalance of the system at the moment, the Reference drivers (specifically the tweeters) have a remarkably natural and unrestrained quality - crisp without ever being bright, so no fatigue. While the Mythos ST's can go high, they at times made me realize I had ears and I was using them, while with the T-1/R's, the sound seemed more much unforced and accurate. This is especially noticeable with cymbal sounds or higher frequency voices and horns. At times the DefTechs presented too much, and too colored, while I don't hear this with the T-1/R's.
In defense of the DefTech's, this may not be a tweeter issue persay, but perhaps because the midrange driver array is less formidable on the Mythos ST than the T-1/R (two 5.25 mids per speaker vs. 4 6.5 inch mid-woofers on the T-1/R's), I was playing things a bit hot to feel a more solid middle. This is another way of saying that the ST's are perhaps not balanced nearly as well as the T-1/R's.
From a sound stage perspective, the Mythos ST's have a slight edge in terms of width and breadth, but at this point I attribute this to the fact that the DefTech experience was fully calibrated with Audyssey MultiEQ, which is designed to help eliminate room conditions that can muddy the sound. With the RBH's, I was just running in manual EQ mode. Later today I hope to re-calibrate.
I'm still finishing some spackling and painting, so I'll hold off on pictures until I get that done.
More later, but first impressions are very positive.