Is it too bright or is it high resolution?

One must wonder if a "to bright"  presentation may be the result of harmonic distortion. Whether this is an amplifier issue a preamplifier issue or the interplay between the electronics and speakers. I am certain that we all want all of the details without undue brightness.
Hearing checks are not the answer.  If your system is unpleasant in the upper frequency(s) then it is time to approach your system problems in that area. Easier said than done.
For example if your speakers have metal dome tweeters then they could possibly be a source of the brightness. As others have mentioned, room acoustics and cables are certainly contributing as well.

brightness and clarity are two different things.  brightness is emphasis on the higher frequencies, and clarity is the definition between instruments, singers, etc.  When wearing sun glasses, the high frequency waves are eliminated, but (especially on the new coated lenses) definition is increased.

If it sounds good to you, isn't that all that matters? Now if your trying to get your system to sound neutral and non-bright, then your going to have to hear other well established systems along with having trusted audiophile friends help you tweak your setup. 

stringgreen, you are more receptive to this question as opposed to the other thread, are you ok? No, I tried wearing sunglasses but unfortunately they did nothing to calm the high frequences but thanks for your input

One must wonder if a "to bright" presentation may be the result of harmonic distortion. Whether this is an amplifier issue a preamplifier issue or the interplay between the electronics and speakers. I am certain that we all want all of the details without undue brightness.

Trace amounts of higher ordered harmonics cause brightness as the ear converts distortion into tonality. It also uses the higher ordered harmonics to gauge sound pressure (rather than fundamental tones) and so is more sensitive to them than modern test equipment.