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Old 7th April 2003, 01:18 PM   #1
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Default Adding weight to a speaker to lower Fs

Hello, i got a pair of speakers for free today.
These are the elements i salvaged.
They are problably not hifi material but since they were free i thought i might give them a shot. I was thinking of running them isobarik in a subwoofer. But I would like to lower their Fs. I read that you could add weight to the dust cover to achieve that. What do you think?
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Old 8th April 2003, 05:43 AM   #2
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apparently you can.

use winisd for isobarik

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Old 8th April 2003, 07:17 AM   #3
SY is offline SY  United States
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Be careful of two things: the Qts is already pretty high, and added mass will make it even higher. The magnet looks a bit weak. And consequently, you'll have some power handling (read: SPL) issues in the deep bass. I'd save the added-mass technique for drivers that have better motors.

Free is nice, though!
“A philosopher is a blind man in a dark room looking for a black cat that isn't there. A theologian is the man who finds it.” - Mencken
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Old 8th April 2003, 08:37 AM   #4
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Don't forget that you also decreasing the efficiency of the speaker if you add mass the the moving part.
/Per-Anders (my first name) or P-A as my friends call me
PA03 LM4780 amplifier group buy, SIGN UP HERE 70 boards delivered but you can sign the queue list.
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Old 8th April 2003, 05:05 PM   #5
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Thanks everyone. I dumped the idea of adding weight, I drilled a hole in a sidepanel I had laying around and am currently running it as an open bafflesub. Although I don't doubt that it would probably not compete with comercial subs I think it's quite good considering the total cost was $0.00.
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