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High SPL Treble
In article , "Arny Krueger" wrote:
"TonyP" wrote in message . au "Don Hills" wrote in message ... In article , (Curious) wrote: Probably having many dynamic super-tweeters would do the job. If their are 140 speakers each playing at 1 dB, you get around 140 dB if they are facing the same direction. Right? Wrong? Wrong. 1 tweeter = 1 dB. 2 tweeters = 4 dB. 4 tweeters = 7 dB. 8 tweeters = 10 dB. 16 tweeters = 13 dB. 32 tweeters = 16 dB. 64 tweeters = 19 dB. 128 tweeters = 22 dB. Close enough to 140 tweeters for you? The 3dB increase each time is debatable, it depends on whether you get phase coherence or not, but it's close enough for this example. I think it's safe to assume 128 real tweeters will not produce phase coherence due to the physical distances involved. This problem could be addressed by adjusting the phase/frequency characteristics of the drive to each speaker. In these days of cheap-but powerful DSP and power amp chips, it's not totally unthinkable. I read with interest the original post. I'm still waiting to hear what tweeter has the highest SPL. I suppose I could research myself, but I don't want to. I don't really belive the EV T350 has the most SPL, but I could be wrong. I invision a larger diaphram/ voice coil to absorb more watts. greg |
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