mclsound,
Would you mind sharing your thoughts about your AT, Volt, ATC, and Scan-Speak speakers? What do you think about the AT woofers? 
Did you ever take measurements of the entire system?
I have to say that ATC/Volt/AT all make some great drivers,not cheap,but good.
I find that if you like your music at low to mid volumes,that any of the drivers available today will be fine....BUT....for the few of us that like to push a Krell 600 to its limits,few drivers will take it but these ones will.
The AT are a little over the top expensive but seem to perform well.
Not many measurements as these were just a prototype....although I measured 110db at 14 feet away in my chair.I am sure that would have been in the upper 120's at 1m.
""UM,what was that honey...You'll have to speak up!!""

LOL