Join Date: Jan 2011
Location: The Old Dominion
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Just beware of advice that additional power will make your speakers "open up" or "sing." That's straight-up nonsense. The fact that you say your speakers sound "flat" for music (which is one of those vague terms that doesn't really mean anything) makes me suspicious that you may have bought into such nonsense, but I dunno. No amp is going to magically "bring your speakers to life."
Most amps (including those in receivers) will drive most speakers pretty loud in most rooms. That said, I don't know anything about your listening habits or your room, so you have to ask yourself this question: Do you think you're overdriving your amp now in two-channel mode for music? If you really think you're driving your amp to its limits (it's certainly possible), then, yes, you'd benefit from a powerful two-channel amp for your main channels. But then, also beware that sound-pressure levels are logarithmic: doubling your power will raise your output levels by only 3 dB.
High power is a good thing, but the returns diminish sharply: It takes 10 times the power to double perceived loudness. Ergo, it takes lots of power (and usually lots of money) to achieve significant gains in output levels.