How to tame brightness


System is:

Audio refinement Complete Int
EPOS - M12
Music Hall Cd25
All Signal cables

Issue:
I love the overall sound of this system, but the Epos tend to get sharp/edgy/hazy/shrill. How can I tame this issue, or does it require and upgrade?
gmc56
Room acoustics seem to be the culprit here. I started playing around with the "reflection points" and found the one behind my head seems the worst. Thanks so much for your insightful comments and pointing to this issue so quickly. Most novices like me never consider this subject. It's always a problem with the equipment!

Greg
Try aiming the tweeter a little out from where they are aimed now. Sound stage may suffer some but if you reduce the brightness it may outweight the difference.
Thats a characteristic of EPOS that I've heard in the past. They might just be extremely honest and clear in the treble, or might exaggerate that area of the treble, I've always wondered. Anyway, personally I love Cardas cable. Use the Cross line to add a touch of refinement to an overly eager treble. Use reference line to preserve neutrality.
Art
Post removed 
04-10-10: Elizabeth
I disagree to some extent with all of the responses so far. Shrill or harsh top end is a problem with power supply. Get a conditioner for that Cd player....
Not just the power cord? :-)