Room is way too bright.

Yes @Audioman58!  Don't overlook the nice wool rug in front of the speakers.

Also many systems can be inadvertently tuned to brighter with some cables containing silver.They seem resolving at first...

The issue is not the output of the speaker into your room, it is the output of the room into your ears. This is the fundamental misunderstanding about equalization and all the other proposed fixes that don't fundamentally change your room acoustics do not understand. Turning down the treble, via whatever means will only dull the direct sound making things worse. You still have a very relective room. As some have mentioned, heavy sound absorbing curtains or vertical blinds will help. Lightweight shades will not because they can't absorb acoustical energy. Acoustical diffusers will even out the room but do not absorb HF energy. Acoustical panels, 2X2 or 2X4 ft on the ceiling will also help, as can a heavy rug with pad. 

Digital Room Calibration Services, Convolver, Headphone Filtersets

This is done remotely. Your system will sound much better afterwards. This does not require physical acoustic room treatment, though you could use them if it already exists. The guy who does this has a great rep.

@lovehifi22 

"I keep hearing about this"first point of reflection." What exactly is that?"

Did you do any online research at all?

There is a ton of information on this subject at your fingertips, yet you seem completely ignorant of even the basics.

I suggest that you Google "first reflection point" and get some basic information on room acoustics, so people can have a proper conversation with you about how to solve your problem.

@OP - curtains on your windows and acoustic treatment correctly applied to the available surfaces.

The point of first reflection is where the off axis sound from the loudspeaker meets the wall and reflects off it. That is where you apply treatment to the sidewalls.

The aim of acoustic treatment is to stop reflected sound reaching the listener's ears out of phase and confusing imaging etc. It can make the sound appear bright due to the excess of reflected energy.