Hi all I'm relatively new to hifi and have fallen head first down the hole. I have a very modest system for our small two bedroom unit- Rotel A11 tribute - Polk bookshelf R100 speakers- rel tzero sub and Project essential 3 TT with Ortofon 20 stylus. I only play vinyl, atm. This setup makes me happy, nice and defined and natural but lacks punch. So I decided to grab a power amp (this is the start of the system upgrade for when we are in a larger living area) and run the tribute as a preamp,for now. The one I choose was again a modest Rotel RB1552 Mk2. I'm running it unbalanced with rca's. It has added more punch and air into the sound but I am finding acoustic guitar fills to be very metallic sounding to the point of harsh. IE Tom petty- Running down a dream and The Cult -She sells sanctuary. Question is, is the 1552 producing the harsh sound or are the Polk R100s not handling the highs well? Rotel RB1552 MK2 rated 130w per channel @8ohm Polk R100s rated 30w-150w at 8ohm? I know the R100s can dip as low as 3.6ohms. Listening volume is 75ish dB. Anyone experienced something similar? Any help or info is appreciated. Cheers