opaqueice;231159 Wrote: > A monopole radiator is - by definition - a spherically symmetric source > that radiates equally in all directions. You could make an acoustic > monopole radiator by, for example, making a little sphere with a radius > that moves in and out with time. It moves out and pushes air away from > itself, then moves in and sucks it towards itself, etc. Woofers in > sealed boxes are pretty close to that, since the entire box vibrates in > and out, but directional sources like tweeter are nowhere close to it. > The acoustic radiation of a tweeter in a box is *not* monopolar. > >
I'm guessing you'll win a bun fight over the scientific words...so I'll wimp out and go with your definition of monopole for now. :-p However, many sources do indeed describe closed-box speakers as monopoles. I note the wikipedia article does too. If this is because of - as you say - closed-box speakers' LF behaviour then that IS interesting. That explains where these arguments come from - because their /non/-LF behavior is to throw energy forwards at most frequencies. And as you pointed out, the tweeters in open baffle speakers aren't really dipole by themselves. Consider these two examples. I'm thinking it's better to write "closed-box" and "open baffle" - which are real speaker configurations with complex behavior - and avoid "monopole" and "dipole" which are abstract behaviours that don't occur over all frequencies in the real world. Darren -- darrenyeats SB3 / Inguz -> Sony DAS-703ES DAC -> Krell KAV-300i -> PMC AB-1 Dell laptop -> JVC UX-C30 mini system ------------------------------------------------------------------------ darrenyeats's Profile: http://forums.slimdevices.com/member.php?userid=10799 View this thread: http://forums.slimdevices.com/showthread.php?t=38593 _______________________________________________ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
