I've had two Rotel amps in the past: RB-890 and RB-990. I noticed that after an hour or two of listening that fatigue would set in. After changing amps- I couldn't bear to part with my Apogees, I now blame a slightly hot top end in Rotel amplification. I'd be careful about tilted-up speakers. I've never heard any B&W DM-series with decent electronics, but they've always struck me as very bright.
