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concept rubber-band sub
concept rubber-band sub
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Old 20th November 2006, 02:37 PM   #1
legendaryfrog is offline legendaryfrog  United States
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Default concept rubber-band sub

well, we all know how subs work, using an electromagnet to pushpull a driver. if someone were to take the driver out and leave the magnet and shaft, it would be possible to attach it to a fairly large rubber-band so it would pulsate back-and-forth. testing this myself i reaching down to about 3hz with minor strumming.

how could this be implemented to produce real "sound" instead of just vibrations?
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Old 21st November 2006, 09:33 AM   #2
Pano is offline Pano  United States
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concept rubber-band sub
Surface area?
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Old 21st November 2006, 09:42 AM   #3
bibster is offline bibster  France
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Damping?
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Old 21st November 2006, 09:48 AM   #4
richie00boy is offline richie00boy  United Kingdom
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concept rubber-band sub
Wouldn't you just be making what is basically a floppy and uncontrolled 'cone' with poor air shifting properties?
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Old 21st November 2006, 03:11 PM   #5
legendaryfrog is offline legendaryfrog  United States
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the rubber-band i used was 3 inches wide, fairly skinny, and 3 feet long. im not sure how to dampen it.
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Old 21st November 2006, 07:12 PM   #6
Pano is offline Pano  United States
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concept rubber-band sub
Are you making a bass guitar with one rubber string?

You aren't going to be able to move enough air with that thing. You'll need more surface area, like a sounding board.

Keep at it though, you might build something cool!
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Old 21st November 2006, 08:33 PM   #7
legendaryfrog is offline legendaryfrog  United States
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it wouldn't be one band. i was thinking about one band for each freq point under 17 hz. each of them would be crossedover to accept only its certain frequency point. i have contacted TB and they'd sell the electromagnet and shaft to me for 8 dollars. 8*17=$136 + free rubber bands. Not to shabby for a sub that can go that low vs. the 13000 dollar eminent tech fan sub.
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Old 21st November 2006, 10:36 PM   #8
TwisterZ is offline TwisterZ  United States
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You would need a resonator to amplify the sound and better couple it to the air.

This might help

http://www.phys.unsw.edu.au/~jw/Helmholtz.html

Check out the part about the Guitar
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Old 21st November 2006, 11:12 PM   #9
legendaryfrog is offline legendaryfrog  United States
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thanks for the info twister
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Old 22nd November 2006, 09:49 PM   #10
BassAwdyO is offline BassAwdyO  United States
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This sounds entirely rediculis... but do post pictures
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