ihcho,,
Looking at the type of amplifiers you’ve tried with your Klipsch I agree there is not much to distinguish one from another. Given the level of amplifiers recommended on this thread I do believe they would raise the sound quality level of the Klipsch. This speaker is capable of reflecting better amplification.
Raven
Atma-Sphere
Line Magnetic
LTA
Pass Lab/First Watt
With all due respect these ’much better’ quality amplifiers would get more out of those speakers than you may realize/appreciate. Just my humble opinion.
Charles