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speakers and amplifiers is important. It's usually better to aim for
the higher end of the manufacturer's recommended amplifier power.
Speakers are more easily damaged by a low-powered solid-state amplifier
that is struggling than by being over-driven. A small amp driven into
overload produces a lot of high frequency distortion that is likely to
burn out a tweeter. Small valve amps under heavy load just fade
gracefully! The sound stage will shrink and music will lose its dynamics
– basically boring.
Speaker impedance is important here, not
just the average but also the minimum (not always quoted!) because
that's a potential black hole for power. Sensitivity matters too – be
cautious if it's much below 89dB/W. For music to be lively, not just
loud, you need "headroom" so that the amplifier can respond instantly to
sudden peaks. Liken it to two cars, one with a 1200cc engine and one
with 3000cc. Both will do 80mph but the bigger engine has the reserves
to respond instantly.
Without that acceleration music will sound undynamic and dull.