jeenam, I am surprised about your STA200 sounding a bit hot on the high end, mine was/is not.
But the reason I am writing is that as mentioned in other threads the STA200 is fairly high gain, and with my tube preamp I was able to turn the volume control up much less than before. At another’s recommendation I purchased the Schitt Sys (volume control) for about $50. It does not plug in, and its between my preamp and amp. I love being able to use whatever range on my volume control I would like.