and is measured with respect to the threshold of hearing or 20 micropascalsSPL = 20*log(sound pressure/sound pressure reference) dBSound Power level or PWL = 10*log(sound power in Watts/10^-13Watts) dBboth are given in decibels so you have to be careful and check which they are refering to. Below are links to some interesting pages I came across related to your question. Most of these assholes don't ever measure the SPL (especially near the speakers) and unnecessarily damage the hearing of their customers.I'm going to assume (maybe incorrectly) that your question about this is in reguards to speaker efficiency. Percieved loudness (and it's problems) is why we have live PA techs and DJs in clubs exposing people to sustained SPLs greater than 128dB. If you were to remove the primary bass frequency from your mix (the one you originally wanted to reproduce) and introduce the harmonics for that fundamental instead, the ear would "percieve" the fundamental even though it wasn't there (this is assuming our ficticious speakers would reproduce those harmonics of course). Let's say you want to reproduce a certain bass frequency, but the speakers you have will absolutely NOT go that low. Psychoacoustic processing is an interesting excercise in percieved loudness. Distortion also changes percieved loudness, along with a hundred other things. You take a 1K tone and a 100Hz tone at the same SPL and ask most people which is louder, the 1K tone will win. ![]() One of the main characteristics to change the percieved loudness of a sound is it's frequency. It's the way out brain interperets the SPL around us. Fact is, most people are fairly poor at it.That brings us to percieved loudness. While some people can give you a range or a close guess, only a meter can give you a true SPL reading. ![]() SPL (Sound Pressure Level) is a measure of loudness.
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