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Is There a Formula for How Much Power to Achieve a Certain Volume for a 5 ohm Speaker

So if my speakers are 87 Db @ 1 watt does that mean that before I get to the point of using the "200 watts into 4 ohm" I'd be running out of the room screaming at the volume? Is it the same 2 x Power = 3 Db gain in volume for a 5 ohm speaker? 100 watts would give me what, over 105 Db and hearing damage well before I get to 200.


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