"Kijanki is right - an underpowered amp can clip when played loud, and clipping of an amplifier causes high-frequency harmonics that are routed to the tweeter by the crossover, possibly overloading it."
This is often what makes a system sound "perceptively" loud when in reality it isn't at all loud. When you have 15" subwoofers with 1000 watt amplifiers that can still clip then it is not hard to imagine that you can exceed any amplifiers requirements (no matter how big) if you go loud enough and deep enough in frequency.
Jaymark's example of a biamped speaker eliminates the problem - you still get crytsal clean highs even if you bass is clipping somewhat.
The issue is to determine whether your listening levels are high enough to often cause clipping distortion in some musical passages.
This is often what makes a system sound "perceptively" loud when in reality it isn't at all loud. When you have 15" subwoofers with 1000 watt amplifiers that can still clip then it is not hard to imagine that you can exceed any amplifiers requirements (no matter how big) if you go loud enough and deep enough in frequency.
Jaymark's example of a biamped speaker eliminates the problem - you still get crytsal clean highs even if you bass is clipping somewhat.
The issue is to determine whether your listening levels are high enough to often cause clipping distortion in some musical passages.