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Rob, I did own the Yamaha before I bought the Rotel, and it was a nice upgrade.
Before I added the amp, I felt that when I turned music up fairly loud with my speakers set to large, I was getting slightly grainy/bright sound. When I was demoing amps I felt I needed something that would tone the brightness of the Yamaha down, and the Parasound HCA-1000 and Rotel RB-1070 amps were the best for me. The Parasound was a couple hundred more expensive so I went with the Rotel.
After adding the Rotel, I can turn my music up quite a bit louder without the brightness and edgyness like I had before. The whole presentation is slightly warmer. The soundstage seemed to open up a bit, and bass is a bit stronger/tighter. These changes were more subtle than dramatic, but IMO it was money well spent.
For HT on the other hand, with all speakers set to small and my Mirage BPS-400 doing a LOT of the work, these differences were negligable. I don't know if I'd be able to tell the difference before and after the amp.
I'm planning on adding a Rotel RMB-1075 or 1095 to my system shortly, then getting rid of the Yamaha and buying a Rotel RSP-1066. The Rotel amp improved my 2ch. stereo listening, but it's still slightly lacking, so hopefully that improvement will make even more difference.
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