Audiolui-
I'm still breaking the 20t's in in my system (I bought them used so they are "broken in") as I've only had them for about 5 days now but I am totally amazed! They are incredible and I've already told my wife that under no circumstances am I giving these up. I have been running through my favorite CD's and I have yet to find one that did not give up previously undiscovered secrets. The highs are so incredibly real. The timber is so true, and the fullness and resolution gives me goosebumps.
I took this hobby up because the emotion in recorded music can be so moving in the right system (for the first time I include my own in this category). In some instances one can "see" the artist and hear what they were thinking and feeling when they play it. I've read reviews that say "beware of poor recordings because these speakers will accentuate it", but even my "poor" recordings sound so real I can stop playing them.
I haven't explored any measurements yet. Frankly I put more emphasis on what I hear but but Aerial's specs say they go below 40 khz. I cannot foresee a circumstance where one would need to add a sub to these speakers. The lows are incredible but never low just for the sake of low. While I must admit deep bass is not what drives my boat, the dynamic bass of these speakers adds a fullness to sounds I would have never thought needed bass to sound their best.
I hate to gush but of everything I've heard these are as close to perfect as I have ever experienced. Of the speakers I have heard in person only the Avalon Isis and top of the line Wilsons are in the same class. If you are near or want to travel to Denver I'de be happy to have you over.
BTW my Aerial 20t's are only series 1. There is a more recent version that is also available new or in an upgrade to the series 1, but at this point I'm wondering how much better they could get.
Mike