concept rubber-band sub

legendaryfrog · 20th November 2006, 02:37 PM

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?

Pano · 21st November 2006, 09:33 AM

Surface area?

bibster · 21st November 2006, 09:42 AM

Damping?

richie00boy · 21st November 2006, 09:48 AM

Wouldn't you just be making what is basically a floppy and uncontrolled 'cone' with poor air shifting properties?

legendaryfrog · 21st November 2006, 03:11 PM

the rubber-band i used was 3 inches wide, fairly skinny, and 3 feet long. im not sure how to dampen it.

Pano · 21st November 2006, 07:12 PM

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!

legendaryfrog · 21st November 2006, 08:33 PM

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.

TwisterZ · 21st November 2006, 10:36 PM

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

legendaryfrog · 21st November 2006, 11:12 PM

thanks for the info twister

BassAwdyO · 22nd November 2006, 09:49 PM

This sounds entirely rediculis... but do post pictures

20th November 2006, 02:37 PM	#1
legendaryfrog diyAudio Member Join Date: Oct 2006	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?

21st November 2006, 09:33 AM	#2
Pano diyAudio Moderator Join Date: Oct 2004 Location: North Carolina Blog Entries: 4	Surface area? __________________ Take the Speaker Voltage Test!

21st November 2006, 09:42 AM	#3
bibster diyAudio Member Join Date: Aug 2004 Location: Lasbordes, 11400	Damping? __________________ Demagogue: One who preaches a doctrine he knows to be untrue to men he knows to be idiots. H.L. Mencken

21st November 2006, 09:48 AM	#4
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	Wouldn't you just be making what is basically a floppy and uncontrolled 'cone' with poor air shifting properties? __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

21st November 2006, 07:12 PM	#6
Pano diyAudio Moderator Join Date: Oct 2004 Location: North Carolina Blog Entries: 4	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! __________________ Take the Speaker Voltage Test!


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21st November 2006, 03:11 PM	#5
legendaryfrog diyAudio Member Join Date: Oct 2006	the rubber-band i used was 3 inches wide, fairly skinny, and 3 feet long. im not sure how to dampen it.

21st November 2006, 08:33 PM	#7
legendaryfrog diyAudio Member Join Date: Oct 2006	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.

21st November 2006, 10:36 PM	#8
TwisterZ diyAudio Member Join Date: Sep 2006	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

21st November 2006, 11:12 PM	#9
legendaryfrog diyAudio Member Join Date: Oct 2006	thanks for the info twister

22nd November 2006, 09:49 PM	#10
BassAwdyO diyAudio Member Join Date: Jun 2004 Location: Illinois	This sounds entirely rediculis... but do post pictures __________________ The golden rule of DIY: Build nice, or build twice!

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