Originally Posted By: mrihar
3. What the heck is SPL? I've been reading that its just a calculation based on watts, distance from a speaker etc. How does SPL actually manifest itself in a tangile way?

SPL is Sound Pressure Level, measured in dB (Decibels). It's how loud the sound is that's reaching your ears. That's why distance matters, the pressure level drops as it covers a larger area.

It takes twice the power to affect a 3 dB increase, but the human ear needs about 10 dB for it to seem that the volume level has doubled.

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