Engadget, watts are only half of how load a speaker gets. Any given speaker will have a certain sensitivity, which is how much sound it will produce with one watt of input at a distance of one meter. A speaker that has a sensitivity of 90dB will sound twice as loud with one watt than a speaker with a sensitivity of 84dB with one watt. Some people have 100dB sensitive speakers that they run with a one-watt amplifier, and it could probably shake your walls down.
A 3 dB increase corresponds to a doubling of the sound energy (pressure^2), but psychoacoustically this doesn't translate into a doubling of perceived loudness.
Loudness depends on spectral content and the individual, but a good rule of thumb is that a ~10 dB increase in sound pressure level yields a doubling in apparent loudness.
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Engadget, watts are only half of how load a speaker gets. Any given speaker will have a certain sensitivity, which is how much sound it will produce with one watt of input at a distance of one meter. A speaker that has a sensitivity of 90dB will sound twice as loud with one watt than a speaker with a sensitivity of 84dB with one watt. Some people have 100dB sensitive speakers that they run with a one-watt amplifier, and it could probably shake your walls down.
You mean 90dB will sound twice as loud than 87dB. It is double every 3dB.
A 3 dB increase corresponds to a doubling of the sound energy (pressure^2), but psychoacoustically this doesn't translate into a doubling of perceived loudness.
Loudness depends on spectral content and the individual, but a good rule of thumb is that a ~10 dB increase in sound pressure level yields a doubling in apparent loudness.