Upgrade path

Tomcy6, that's crazy I just spoke with Theta this afternoon. They said the exact same thing! The only recommendation they gave was to go with a set of mono block amps which would give more current. Of course they recommend Enterprise and Citidel monos. Said I should stay away from tubes as they would be mushy with the Dunlavy speaker said? Said Mac amps would be nice however a different sound. Also said while Krell would grip the bottom end I would lose a lot of midrange magic. One thing I've learned is the Theta takes a long time to warm up and now I keep in stand by mode. And must say the amp sounds great to me! May just look at a better preamp but I need one with 2 sets of main outputs so I can continue to bi amp with the Theta(which is the main reason I thought of replacing the Theta)

Any thoughts on Mcintosh MC2500? Got a line on one that's been completely rebuilt

The MC2500 is one of the amps that made McIntosh.  It is a professional unit and there really isn't a current manufacture direct comparison that I'm aware of.  Bullet-proof, outstanding sound quality.  If you ever wanted to move into Mc, it would be a good way to go.

Good luck & happy listening!

Not a fan of the Macs. Excellent build quality, plenty of parts, and service techs, but the sound to my ears is lifeless. And though with such copius power it might not matter too much, but sacrificing the otherwise advantages of frequency linearity of ss to accommodate auto-formers is non-sensical to me.