I dropped by Dennis' place yesterday to do some further listening to his Signature SE speakers. I had heard them twice before, but each time we were focused on other things: measuring the response and setting up an ABX test. This time we just leisurely listened to the speakers.
To provide the final conclusion first... I *really* like these speakers! They are both aesthetically beautiful AND they make beautiful music. Dennis previously posted pic's of the speakers, but honestly, the pic's don't do the finish justice. It is really stunning. The metallic flake in the paint is actually much finer than it appears in Dennis' pic's. The finish looks like it's a half inch thick and like it's still wet.

Dennis builds and finishes drum kits on the side. I've seen several of his finished kits. He sets a *very* high standard for finishes. That the Legacy Black Pearl finish is acceptable to Dennis speaks for how beautiful it really is.

While these speaker really "shine" visually, their primary claim to fame is their sound quality. The ribbon midrange and tweeter are truly artistic music reproducers. Jeff, (pepar) described them as "silky" and I totally agree. The tap of a cymbal, the transient of a plucked string, sound of brushes on a snare drum... these are all reproduced with incredible realism and clarity. These speakers easily resolve all the detail in a recording without adding any harshness or excessive brightness. The treble and upper midrange is where these speaker really "shine".
Edit: I previously owned a set of AV911 Strata Mini's, which used ribbon midrange and tweeter drivers. I *loved* those speakers for their upper mids and highs. The Legacy Sig SE's sound VERY MUCH like the Strata Mini's in the upper mid's and highs. The one downside of the Mini's was a very narrow sweet spot. It was so small that you couldn't turn your head, and you couldn't slouch. If you were in the sweet spot, they were glorious. Outside the sweet spot, even by an inch or two, the soundstage disappeared. The Sig's, retain the excellent sound and soundstage *without* the extremely small sweet spot.
Most of the midrange is covered by the 7" cone mid-woofer, (180 Hz to 2.8kHz.) Through this range, I would describe the sound as deadly accurate. This is the range where the human voice is most prominent. Male and female voices where reproduced with no hint of nasality or chestiness. I did hear some graininess to some voices, but when we turned Audyssey on, that completely disappeared. I think the graininess was something in the front end because it was completely removed with Audyssey.
One of the things I like best about these speakers is the prodigious bass they reproduce. The dual 10" drivers in sealed cabinets exhibit incredible LF extension. We measured them down to their specified 22 Hz -2 dB point, and they are the real deal. (Dennis has those measurements, and I will let him post them.)
We played around with different combinations with Dennis' dual M&K subwoofers. We tried "Double Bass", standard Bass Management with 80 Hz crossovers, Bass Management with the speakers set to Full Range, and just the speakers with the subwoofers off. My personal favorite for music was the speakers alone, without the the subs. This is the first system I've ever heard where I preferred the bass from the speakers to bass from dedicated subwoofers. (I think this says more about the SQ of the bass from these speakers vs. the bass from the outclassed M&K subs than it does about subs and Bass Management in general. If Dennis were to add a couple of high quality subs to this system, it would easily become a "world-class" system.)
A speaker needs to be completely integrated to reproduce the sound of a drum kit. Drums have deep bass fundamentals, percussive mid-bass and impactful midrange as well as dynamic and brilliant treble. Dennis is a drummer/percussionist and it is fun to watch him listen to music on these speakers. He plays the "air drums" while listening, kicking the bass drum and hitting the snares, toms and cymbals. I agree completely with his comment that these speakers reproduce drums as very realistically. That is probably the biggest compliment Dennis can give a speaker system.
To be fair, I was somewhat disappointed in the Phantom surrounds in Dennis' system. I don't mean to imply that there is anything wrong with the Phantom surrounds, but in Dennis' system, they are mounted in such a way that he's not able to take advantage of the dispersion of the tweeter. The Phantom surrounds have a "front" mounted tweeter. As such, they need to be mounted at 90 degrees to the LP to be in the dispersion pattern of the tweeter:

In Dennis' system, they are mounted behind and above the LP. On several occasions I got up and walked back to the more ideal spot for the surrounds. The front soundstage suffered, but the directionality and immersiveness of the surround-field improved exponentially. We ended up raising the surround trims by 2 dB and that helped some. Nonetheless, I think the Phantom surrounds are pretty sensitive to placement. If they can be placed ideally, they would be absolutely excellent surround speakers. If their placement is compromised... maybe not so much. I suggested to Dennis that he try to configure some wedges that would aim the Phantom's more forward toward the LP. He is, I think, considering that option. He's a pretty "handy" guy, so I'm sure he could do it.

Bottom line, the Legacy Signature SE's are excellent speakers. They have all the qualities I would look for in a full range speaker: excellent high frequency detail without harshness; accurate midrange without "coloration", and prodigious, clean, tight bass response. They would work very well as the mains in an HT system and they would be superb as the L/R's in a stereo pair. In the later system, if the room cooperates, they could easily be used without subwoofers for music reproduction.
Craig