Human tweeters...

454Casull · 25th April 2004, 01:41 AM

If they're so good - example - why aren't they popular?

Plus, the price for the 002M is only $48.

HeatMiser · 25th April 2004, 02:34 AM

Because his web site is so inscrutably difficult to navigate that you are the first to actually find a price list; no mere mortal has successfully ordered any products.

Just kidding, of course (well, mostly); I've been curious myself.

cowanrg · 25th April 2004, 02:43 AM

hum, i clicked on this thread thinking they found a way to rip out a person's ear drum and make it into a speaker. no such luck. i would buy one in a second for the pure novelty factor!

CeramicMan · 25th April 2004, 05:00 AM

Why? I don't know, but I notice that they use inverted domes...

I suspect that concave dome tweeters are superior to ordinary convex dome tweeters simply by design. Because the dome is curved inwards, the voice coil can't (and shouldn't) be located on the very edge of the dome, but has to be smaller (as with cone speakers). This is beneficial to the performance of the tweeter because for the same size and the same dome material, the concave ones have a higher break-up frequency compared to convex domes.

For example, a 25mm convex dome tweeter probably has a 25mm voice-coil, while a concave dome might have a 19mm vc. The vibrations that the voice-coils generate can be thought of as extremely fast ripples travelling across the surface of the dome. Therefore, in terms of break-up frequencies, the tweeter with the 19mm vc wins hands down because of the smaller distance that the "ripples" can travel before getting reflected and resonating.

BTW. I was only talking about tweeters with hard domes like aluminium or ceramic or titanium etc. Many measurements show that soft dome tweeters (fabric, plastic etc.) sometimes have lower break-up frequencies than their accompanying midwoofers!

CM

currier · 25th April 2004, 02:44 PM

someone on the MAD board said they tested them and they weren't as flat as they thought they should be. I believe they are matched very well with the old EPI woofer and the two of them sum very nicely with a simple crossover. When used outside that system there may be some challenges to face. You might want to do a search at the MAD board or post there.

25th April 2004, 01:41 AM	#1
454Casull diyAudio Member Join Date: Jan 2004 Location: Toronto, ON, Canada	Human tweeters... If they're so good - example - why aren't they popular? Plus, the price for the 002M is only $48.

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25th April 2004, 02:34 AM	#2
HeatMiser diyAudio Member Join Date: May 2003 Location: Washington State, USA	Because his web site is so inscrutably difficult to navigate that you are the first to actually find a price list; no mere mortal has successfully ordered any products. Just kidding, of course (well, mostly); I've been curious myself.

25th April 2004, 02:43 AM	#3
cowanrg diyAudio Member Join Date: Apr 2002 Location: Lafayette, CO	hum, i clicked on this thread thinking they found a way to rip out a person's ear drum and make it into a speaker. no such luck. i would buy one in a second for the pure novelty factor!

25th April 2004, 05:00 AM	#4
CeramicMan diyAudio Member Join Date: Nov 2003 Location: Brisbane, QLD	Why? I don't know, but I notice that they use inverted domes... I suspect that concave dome tweeters are superior to ordinary convex dome tweeters simply by design. Because the dome is curved inwards, the voice coil can't (and shouldn't) be located on the very edge of the dome, but has to be smaller (as with cone speakers). This is beneficial to the performance of the tweeter because for the same size and the same dome material, the concave ones have a higher break-up frequency compared to convex domes. For example, a 25mm convex dome tweeter probably has a 25mm voice-coil, while a concave dome might have a 19mm vc. The vibrations that the voice-coils generate can be thought of as extremely fast ripples travelling across the surface of the dome. Therefore, in terms of break-up frequencies, the tweeter with the 19mm vc wins hands down because of the smaller distance that the "ripples" can travel before getting reflected and resonating. BTW. I was only talking about tweeters with hard domes like aluminium or ceramic or titanium etc. Many measurements show that soft dome tweeters (fabric, plastic etc.) sometimes have lower break-up frequencies than their accompanying midwoofers! CM

25th April 2004, 02:44 PM	#5
currier diyAudio Member Join Date: Apr 2004 Location: Texas	someone on the MAD board said they tested them and they weren't as flat as they thought they should be. I believe they are matched very well with the old EPI woofer and the two of them sum very nicely with a simple crossover. When used outside that system there may be some challenges to face. You might want to do a search at the MAD board or post there.

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