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The unit of sound loudness is a Bel, so called after Alexander Bell.

1/10 of a Bel is a deci Bel, or deciBel, or simply dB.

Secondly, it turns out that speakers are rated according to their efficiency (amount of loud at full rating.) A high-efficiency speaker like a bass-reflex speaker has a "Sound Pressure Level, or SPL of, say, 108dB.

So, just a handful of watts will drive the high-efficiency speaker to very loud levels. The old Yankee Stadium speaker system was driven by only 10 watts.

If there are high-efficiency speakers, then there must be low or intermediate efficiency speakers, too. That is the case, and the acoustic-suspension speaker in a sealed enclosure is a good example. But their SPL is more like 88 to 95 dB, say.

So the output, or SPL of your 400-watt speakers depends on their efficiency, and your question cannot be answered without more information.

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Q: How many Db can 400 watt speakers get up to before blowing Also what Db should you be playing at on average for Parties etc?
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