How to tame brightness

Could be just the fact that Epos has metal tweeters and your ears don't get on with them. Have you tried a soft dome tweeter speaker before?

I really hate the metal dome tweeter scape goat. One of the brightess speakers I have is the Proac Super Tablette, yep soft dome tweeter. Also, much of the brightness comes from the upper mid range so the tweeter has not impact here.

Vinny

Vinny, have you ever owned Epos? Are you familiar with their sound?
Metal domes generally are brighter, IMO and others, to soft domes. Some exceptions may apply of course.

Some SignalCable models are brighter than others... Which specific models are you using, including the power cords?

If you're using all Silver Resolution then use the copper high-current power cords and use the copper Analog Two interconnects from your CD source to your amplification.

It makes a very appreciable difference.

Fix your room and your power.