Emotiva is not high end, imo, it's mid-fiWhat Dave72 is probably hinting at is, the amp's resolution is mediocre by hi-end standards.
If that is indeed the case, another amp is needed -- higher powered rather than lower. Any of the amps you mention should do.
The best sound I had from these was with a Soulution stereo -- but that is outrageously expensive.
OTOH, an unusual choice may be the currently trendy stereo Marantz. It's not very expensive and performs extremely well on normal, i.e. not shrill, speakers.