Bauhausler
Rational Subjectivist
I'm thinking I'd like to exploit acoustic rolloff of an open baffle speaker to sharpen the LF cutoff of the response of a midwoof driver. As I understand the theory, below the frequency where the radius of the baffle equals 1/4 wavelength, the front and back waves destructively interfere and acoustic output drops way off. Is this correct? For a large driver (say, a 7" Lowther), where is the radiation point measured from? Driver center? Also, the speed of sound in air is, like 750 FPS @ STP or something close to that, right?
Under those assumptions a circular baffle with a 2' diameter would begin to roll off at 187 hz. To confuse the issue, if the driver area is a substantial fraction of the total area, then the sound does not have a point source and a single path length to the edge. How does this work in practice? I don't want to build a box if a baffle will work fine. Anybody have experience they want to share?
Cheers
Under those assumptions a circular baffle with a 2' diameter would begin to roll off at 187 hz. To confuse the issue, if the driver area is a substantial fraction of the total area, then the sound does not have a point source and a single path length to the edge. How does this work in practice? I don't want to build a box if a baffle will work fine. Anybody have experience they want to share?
Cheers