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Old 18th February 2009, 01:47 AM   #1
jbell is offline jbell  United States
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Default slaps = acoustic lever?

Dumb question... but with the different size surrounds front and rear... is an earthquake slaps, effectively the same thing as dr. geddes acoustic lever? and is that why earthquake claims +6db?

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Old 18th February 2009, 09:29 AM   #2
Ron E is offline Ron E  United States
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They probably claim +6dB because passive radiators don't suffer as much from port compression, although suspension nonlinearity can still be a factor.
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Old 18th February 2009, 01:52 PM   #3
jbell is offline jbell  United States
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Earthquake claims that a combination of the 'M' surround and the big roll surround that it's linear over 1.5" of travel (3" p-p). I have to believe that the differences in the surrounds presents different pressure areas on one side vs the other, which would be a lever.

I know in earthquake subs I've watched with the slaps, I see the slaps appear to move MUCH further than the driver.

My thought was that this is a lever, and it solves the issue geddes had with having a device mfg'd that would have sufficient travel, and not prematurely fail.

If this is a lever.. another interesting part to me, is that both the slaps, and the lever are patented..
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Old 18th February 2009, 10:17 PM   #4
Ron E is offline Ron E  United States
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Quote:
Originally posted by jbell
I know in earthquake subs I've watched with the slaps, I see the slaps appear to move MUCH further than the driver.

My thought was that this is a lever
PR's generally move at least 2-3x as far as the active cone they are coupled with assuming they are the same size.
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