Ok, it kills me to see you as the only poster in your thread
, so I'll give you my advice.
I have been looking for exactly what you are for quite some time now and have done considerable research to find a design I felt will give me that "best of both worlds" SQ. I believe it exists, but when it comes right down to it there is as much, or more, subjectivity than objectivity when it comes to declaring a speaker capable of this apparent dichotomy. The SPL is the relatively easy parameter to determine. It's when we get to dynamics that it gets harder and more subjective, and then when we get to SQ it becomes intensely personal.
One thing is for sure, your decision will be much easier if you can determine your order of priorities. For example, I know that however good a speaker might sound at low volumes, if it doesn't have great dynamics at or near reference level I want nothing to do with it. For me, a speaker must be capable of performing cleanly and effortlessly at all volumes that I may EVER want to listen. That pretty much narrows the field to very few speakers at ANY price point. But that doesn't mean I don't want superb SQ, it just means that the speaker must first clear that hurdle for consideration. You need to determine YOUR hurdle.
As you know, auditioning speakers is not always an easy task and, as well, it is hard to evaluate a speaker without direct A/B listening tests. So much of my research has been into looking at speaker designs and measurements(not just on axis FR, but polars/wavelets, distortion plots, etc.), and then listener impressions, to determine what speakers are likely up to the task. Keep in mind, however, that all speaker designs have comprimise somewhere. But knowing design allows you to understand the comprimise so the deficiencies are somewhere you care less about. Although I have run across what appear to be essentially "no comprimise" designs, not one of them has been under 20K(Triad Platinums as one example).
So, I have a short list of speakers that I believe have the characteristics you're looking for and would suggest you at least look into them since I believe you would be doing yourself a disservice if you didn't. I'm sure there are probably many more, but these are the ones on my short list and are all exceptionally designed. They're in no particular order and vary a bit in price, but all are likely far less than the "audiophile" speakers your considering and all those on my list would, IMO, match or beat them in SQ(subjective!!) and totally embarass them for HT. Danley, for example will let you schlep ANY speaker you want to their facility and they will hook them up so you can A/B against their speakers. That's confidence! And of the reports I've seen from folks that have done it they end up with Danley's for the ride home
Wayne Parham's 4Pi http://www.pispeakers.com/catalog/pr...roducts_id/105
Danley Sound Labs SH50 http://www.danleysoundlabs.com/syner...?model=SH%2050
Seaton Sound Catalyst http://www.seatonsound.net/
- Uses the same coaxial design as the JTR's but utilize active crossovers
Gedlee Loudspeakers Summa http://www.gedlee.com/
- Now offered with active crossovers!, Sweet!!
And last, but not least(because it's what I'm building
), a 2-way DIY design utilizing the AVS community designed 15" SEOS waveguide http://www.avsforum.com/avs-vb/showthread.php?t=1291022
, the B&C DE250 CD(or better), and the awesome AE TD15M driver with active crossovers.