More power does not equate to listening at lower sound pressure level. The correct alternatives would be a near field setup, highly directive speakers, or headphones.
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As mentioned I have 2 275's driving only my mid/twitters of my RS 1B's. Jumping from one MC 275 to two was a difference. It did provide a bit more power but I was surprised how powerful only one 275 was!!! Yes a difference but not a major one. However, I think you will see (hear) more because: as I said I only use the Mac's for mid/high sections AND I listen at a normal to low volume.
So...go for the two!!! :)
I doubt that "someone in the industry" is correct. The extra reserves just don't come into play at low volume. In fact, the opposite is more likely true. A lower powered amp will be operating in its comfort zone, and many audiophiles believe that sounds better than using too big an amp that is loafing along.
On the other hand, a well set up dual-mono setup may have certain other advantages, and if you occasionally play loud music - symphonies more or less require it, or you can't hear the quiet passages - that's another matter.