Speakers sound too bright.

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

Just a reminder/info for everyone.  The OP has a pair of Martin Logan Motion series speakers.  These are typical box speakers with a folded Heil style tweeter. They are not the electrostatics that Martin Logan is better known for.

@rwalsh07 "What did you have before the Lintons?"

Let’s see: Bose 901 Series I and IV, Infinity 1001a, Infinity Column II, Infinity Monitor 2A, Infinity RS 2.5, Infinity Renaissance 80, Triangle Celius, Triangle Antals, Magnepan MMG, Magnepan .7, Tekton Perfect Set 2-12, Tekton Perfect Set 15, Moth Audio Cicadas, KEF LS-50s, Klipsch Heresy, M-L Electro Motion ESL, and some others