Speakers sound too bright.

I had that problem the Meitner MA3 Dac calmed everything down just right..if you look on the used market you may find one..

I didn’t read all 90 something replies, but you somehow you need to get them farther from the front wall. Pull your listening chair closer and make sure the speakers are about the same distance from the side walls as the back. I had a pair of Logan Monoliths. Look up how to do the flashlight trick on your side walls and they probably need at least 100 hours of break in time. When you get everything set up, the sound should almost envelope you. The light trick will help you tow them in and leaning slightly back will also help. Good luck. 

I remember when I bought a pair of speakers that were the same brand I had but an upgraded pair that I thought sounded too bright. Turning down the treble fixed that for me.

I don't believe a speakers changes sonic characteristics after a period of time.

How very disappointing for me go on a really good rant about the wrong speakers! 
 

Your csbles if using a usb cable try the 

Cardas clear cable co 

Around $400 

Or less AQ Coffee