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Sorry to hear that. I’m not a fan of Rotel amplifiers in general, they always seemed bright. B and W’s are fine speakers, I would try another amplifier.

It’s interesting in that both companies are or were under the same ownership. 

One would think those products may be synergistic.

I would by a few Akiko Audio Tuning Sticks (XLR/RCA) and try plugging them into various components.

I had one too. I listened to a lot of music. But there were no such problems. Recently I found a website https://www.styngr.com/ There's a huge library of songs for video games. Now I listen to music through another audio system. 

Go to a dealer and try to find something that sounds good to you.  Tell them the issues you are having with your system and they may be able to assist you.