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Odd inner cone


Roland Rock
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This is my 2x10. I've had it for years and love it. With the silver cloth grille removed, you can see that one of the speakers has an odd extra inner cone. Any ideas what it does? Both of the drivers say Eminence Delta on the back.




I'd ask the maker, but he has disappeared after a nasty alleged "took-money-didn't-produce-the-goods" internet bashing. He's always been great with me, and with the weak dollar at the time, I got a lovely cab at a good price.

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I can't get the back off, but have removed the control plate and had a peek. Firstly, they are Legend, not Delta and very different looking from behind. The one with the extra cone has a wire mesh hole of approx. 20mm diameter on the back.
Wiring seems very straightforward. Two wires, +ive and -ive go from speaker in question > other speaker > 1/4 jack socket > speakon socket

Edit - just found this. looks like it's a 'Whizzer cone'
[url="http://en.wikipedia.org/wiki/Full-range_speaker"]http://en.wikipedia....l-range_speaker[/url]

Edited by Roland Rock
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Have a look at the Eminence web site. The strange looking one looks like a [url=http://www.eminence.com/speakers/speaker-detail/?model=Legend_B102]Legend B102[/url], if the other also says Legend on the back then it could be any of the Legend bass or guitar speakers. Reading the spec it doesn't appear to be a dual concentric design.

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Yep, it is a whizzer cone, they used to be very common in the sixties and seventies and the aim is to increase high frequencies. Speakers used to be much more expensive compared with income and one speaker was expected to cover the full frequency range.

They don't have lower mass as one of the respondents says in the above link. The main cone + whizzer obviously weighing more than the cone on its own. Large paper cones flex especially at high frequencies so the middle of the cone may be moving more than the outside. Speaker designers have always exploited this to get a controlled frequency response and the whizzer is a way of trying to get a bit more top end. Other manufacturers do this by adding an aluminium dome to the centre of the speaker or by doping the dust cap with something to make it more rigid. Peavey do this with their Black Widows for bass guitar.

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