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The trick is to find good and efficient speakers.
Some speakers work like crap, and need a poweramp to power them.
I've heard some speakers 82dB SPL, powered by a 100W power amp, while 89dB SPL speakers can be just as loud with just 1/4th of that power.
For every +3dB you need to double the amp's power.
Choosing good speakers, is a first step.
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