Hey Tim! Hmmmm! Are we sliding down the slippery slope? Do I gather from your post that the 75 watt OTL might be of a certain Montreal origin and possibly be called an Alto? No, I mean Soprano! No wait, maybe it's a TENOR?????? Do I smell a junkie in the making?
On the serious side my friend, both of those speakers will sound excellent IMHO, with the Tenors. Unfortunately, it would be best to hear them both with the Tenors in the same system. I know this sounds crazy, but I once took my power amps and my CDP to a dealer who carried the two lines of speakers I was considering to hear them with my stuff. Way crazy I know, but it was well worth the effort. I say this because if you get the Tenors, you could take your Aero and the Tenors to a dealer who carries the speakers and at least see what you think (this is assuming you cannot get a home audtion of the speaker).
As far as the Tenors go, I will say that IN MY OPINION (which is based on MY experiences, MY tastes and preferences and MY room and gear), they are BY A LARGE MARGIN, the finest amplifiers this man has ever heard. I have had my beloved Lamms for 4 years and would not have believed it if I had heard it with my own ears, just how much better the Tenors are. They are better in every area, even the bass, yes, I said bass. They are uncanny holographic, refined, effortless, rich, balanced and with simply stunning realism. Their harmonic purity is unbelievable. Do you get the opinion I like them? I have heard many a fine amplifier in my system, but for me, nothing has come close to what these amps can do.
So, are you getting hooked yet? If you do get the Tenors, you can build a system around them and be in sonic heaven. Although the Vandy's would be an easier load, I know for a fact that they sound wonderful with the Parisfals. I have them mated with the Kharma Midi-Grands and they have MORE than enough power and headroom to rock the house (something I was a doubting Thomas about before I got them). I am known to listen to certain funk music and large scale classical at high SPL levels and the Tenors produced the goods better than my former Lamm 100 watt hybrids.
Welcome to the abyss!
Frank
PS - just to be clear, I AM talking about the Tenor 75 watt OTLs not the new 300 watt hybrids that I ordered. I have the 75 watters in for review (and I am thinking about just keeping these as I cannot fathom the hybrid being better!)