Bigger Amp?

The Spark is rather a lean speaker to begin with. Maybe you should look at a sub woofer.

as far as ss amps the amp you have is about as warm as ss gets. conrad johnson owns them now.[ great company] as far as tube mantinence, they are not hard to keep running if well built. if a ss amp wears out its outputs thats not cheap. if a tube amp wears out tubes just pop in some new tubes. most tubes will last a long time though. just buy a good tube amp and never look back. i am sure you can trade that ss in on one, are someone might do some trading with you. i might even take it towards some tubes i have.

A second thought on the never ending shuffle of equipment. You say you don't want tubes but me thinks its going to haunt you. You sound like me a few years back! (no insult intended and I apologize in advance.) I have found that the best soft dynamics I have ever heard have always been with well designed horn speakers. Oh Oh,- there goes the whole system! There is a discussion about this at audioasylum.com in the effecient speaker forum (dated 12-15-01) called "Higher effeciency=Better dynamic impact?". I think I agree with the general drift of the discussion there. Check it out and keep listening to some good high effecient horn speakers with tubes. God Damn the Pusher!
CK

The HT Pro Silways introduced too much shrillness/brightness/sibilance into my system. The Truthlinks were a lot warmer sounding at the expense of some rolled off highs, but worth it to me. I currently use something else, but possibly you could experiment with some different cables before changing gear.

If you like the overall sound of the McCormack but want to make a significant upgrade, you might try the SMc Audio upgrades. I went from a 0.5 DLX to 0.5 Rev B and the improvement was very significant, across the board. You might want to talk to them about your associated equipment. Another thought, if you are using the Theta as a digital volume control, others have reported loss of dynamics and overall "thin" sound when using digital sources without an active pre-amp. Maybe try borrowing one and see if it helps (tube pres work well with McCormack amps; I am using a BAT VK3i).