gbhsi1:What do your speakers sound like? HF frequencies ise
Well, I used to suffer from bright treble with MA RS1s in a reflective room. I waited some time and solved it with new kit. The move to Spendor speakers solved 90% of it, making the treble smooth yet more extended. The change of amp to the pre/power I have solved the last little bit. The AVI preamp has resulted in any harshness disappearing, unless it's on the recording.
As I've said before, tweaks to reduce harshness that have worked for me are:
1) Fire the speakers straight out rather than toeing in
2) Keep them away from reflective surfaces, e.g. side walls, etc
3) Use thick copper speaker cable and avoid silver content anywhere
4) Lay a thick rug in front of the speakers, either one in the middle or one each side
5) Get your speaker spikes level to ensure good bass, helping to give better balance. I did this with my stands on the patio and spent a lot of time making sure they were perfectly level.