Adding weight to a speaker to lower Fs

haffe · 7th April 2003, 12:18 PM

Hello, i got a pair of speakers for free today.
These are the elements i salvaged.
http://www.factory-outlet.nu/bilder/...250-sistor.gif
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?

mikee12345 · 8th April 2003, 04:43 AM

apparently you can.

use winisd for isobarik

SY · 8th April 2003, 06:17 AM

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!

peranders · 8th April 2003, 07:37 AM

Don't forget that you also decreasing the efficiency of the speaker if you add mass the the moving part.

haffe · 8th April 2003, 04:05 PM

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.

7th April 2003, 12:18 PM	#1
haffe diyAudio Member Join Date: Dec 2002 Location: Sweden	Adding weight to a speaker to lower Fs Hello, i got a pair of speakers for free today. These are the elements i salvaged. http://www.factory-outlet.nu/bilder/...250-sistor.gif 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?

8th April 2003, 06:17 AM	#3
SY diyAudio Moderator Join Date: Oct 2002 Location: Chicagoland Blog Entries: 1	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! __________________ If there's a sucker born every minute, where do the rest of them come from?

8th April 2003, 07:37 AM	#4
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	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 Tube Buffered Gainclone in work \|Thread

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8th April 2003, 04:43 AM	#2
mikee12345 diyAudio Member Join Date: Nov 2002 Location: NZ	apparently you can. use winisd for isobarik

8th April 2003, 04:05 PM	#5
haffe diyAudio Member Join Date: Dec 2002 Location: Sweden	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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