Maybe I should not comment. Maybe I got a bad piece, but it was a used unit from an authorized dealer. I had a preamp, AC3 with the Alps. It was ok. My First Sound creamed it when they were head to head in my living room. The First Sound was much more clear with deeper and more powerful bass. First Sound just stood out all around for somewhat the same price. I actually got the best performance by running the Airtight with the volume wide open and had a passive attenuator either before or after it running the volume. That surprised me but it was a lot better. As far as the preamp, it was hard to find good tubes for it 12ax7 if I remember. Went through a few different ones with Brent Jesse. I hear they eat power tubes. At least a very knowledgeable person in the know said the ATM-2 is run hard and eats power tubes. He told me to get the Altecs I have. I could not be more happy. Well, sometimes I dream of a SS amp. Not sure why.
I heard the monoblocks at a store last summer. The store had issues with the room. They did little for the Wilson Sasha. The Audio Research I heard pushing the Sasha were wonderful. Also a better room. Under the right circumstances maybe the Air Tight sing but not for me so far. I could have got a lemon, hence the return and once again, the room I heard the Monos in was pretty compromised. The VAC I had at my house and heard in stores were always more solid a performer. Voiced somewhat similar IMO.