Tuesday, January 14, 2014

New Loudspeaker Sound Pressure Calculator

I have added a new version of the Loudspeaker Calculator here, more convenient for simple one-speaker calculations:

Calculator for Loudspeaker Sound Pressure Level

The new calculator lets you see the sound pressure levels from a loudspeaker in a specified room, and it is easy to get an overview of the different parts of the sound - direct sound and reverberant field.

The direct radiated SPL is the sound from the speaker with no room contribution, as in an acoustically dead space.

The reverberant contribution is the sound contribution from all reflections in the room. The same simplified model from the Calculator for Speaker Requirements is used, it will be reasonably valid for small rooms with normal dimensions. Keep in mind that reverberant sound field behaviour in small rooms is very frequency dependent, as you approach lower frequencies, around the Schroeder frequency, the sound field will be dominated by discrete reflections from and between boundaries.

The sum total SPL is the diffuse field sum of the direct and reverberant sound.