Less fatiquing

I agree with Hooper. The amps may be playing a role in this, but it is more likely your source or speakers. Consider upgrading to a Transport/DAC or computer/DAC, which is superior. Mods to these can further minimize sibilance. Some sibilance will be caused by jitter in the digital signal.

Steve N.
Empirical Audio
Manufacturer/modder

its not the bryston stuff...its nuetral as neutral

Your problem is NOT your speakers. Have you ever met an audiophile who didn't recommend that you trade up? (OK, I do it all the time myself). Seriously, I have a second system with the very similar 7PT PSBs and an NAD receiver. I have a Denon player as a source, but use the NAD's DACs. With MIT cabling, I have, if anything, the opposite problem. Sometimes I feel as if everything is covered in molasses. No, I don't necessarily like things on the bright side. I would try your speakers with some NAD electronics before I replaced the speakers. No, it doesn't have the pedigree of something like Classe, but it might be a synergistic combination.

Try some Timken bearings as coupling footers.

Model # 09067 bearing resting in LM11910 mismatched race

top each footer with a Small DH Cone

This will give you a very good idea about their performance characteristics, you can then tweak/reconfigure them further to fine tune your results.

I was told the thicker the interconnects the more bass and the less high frequency information will pass through as I have personally found this to be true, could be a solution. I don't like shrill but if it is refined, maybe just a bit extended otherwise look into a warmer amp like the Classe as suggested above.