Warm Tube Amp(s) to Tame Hyper-Accurate Speakers?

@alphonsodamato - Is there any possibility of having your Spendor dealer loan you a pair of Classic 2/3's for comparison purposes.

That will quickly tell you if the speakers are the issue.

I may have said this before but if you are not fond of steak, no amount of seasoning or preparation work is likely to change that fact.

So it is with a speaker.  If your speakers are restricting what music you listen to, something is fundamentally wrong with that choice.  And then to make matters worse, spending thousands of dollars hoping force the situation is usually money poorly spent as well.

Putting components together is akin to a talented chef choosing the right seasonings for a given entree--but don't expect him to turn steak into lobster.

@alphonsodamato -

     What tubes are you using in your 275 (small signal and power) and preamp?

     How much absorptive material in the room?

     Lots of hard surfaces, between you and the speakers?

     Is your music strident, with all sources?

+1 @rodman99999 is asking fundamental questions for the OP. If these are not answered, then this really becomes a thread about mindless gear swapping.

Try any of the earlier Cary Audio preamps/amps. You'll be swimming in syrup...