Subwoofer Design

Chester01 · Dec 23, 2004, 11:50 PM

I have come up with a new idea for a subwoofer, it would be used to tune a 180 degree phase shift for the subwoofer (3 db increase) at 20 hz is what I am planning, considering that 1/2 of a 20 hz wave is approx 28.5 ft long I would use a long "wound" tube to get the length needed. I would use PVC piping and sonotube for the main outside tube (sonotube is the stuff they pour concrete in when making columns of concrete)
http://n.1asphost.com/Chesteta/sono2.JPG

tell me what you think please!
EDIT: my main worry is that teh smaller pipe used on the inside of the sub will create too much backpressure and not allow the subwoofer to move as much air Any ideas if this would be an issue or not anyone?

Chester01 · Dec 24, 2004, 03:42 AM

a slightly better/different drawing of it

http://n.1asphost.com/Chesteta/sono4.JPG

Dec 23, 2004, 11:50 PM	#1
Chester01 HardwareHeaven Senior Member Join Date: Jan 2004 Location: St. Cloud, MN Posts: 492 Rep Power: 0	Subwoofer Design I have come up with a new idea for a subwoofer, it would be used to tune a 180 degree phase shift for the subwoofer (3 db increase) at 20 hz is what I am planning, considering that 1/2 of a 20 hz wave is approx 28.5 ft long I would use a long "wound" tube to get the length needed. I would use PVC piping and sonotube for the main outside tube (sonotube is the stuff they pour concrete in when making columns of concrete) http://n.1asphost.com/Chesteta/sono2.JPG tell me what you think please! EDIT: my main worry is that teh smaller pipe used on the inside of the sub will create too much backpressure and not allow the subwoofer to move as much air Any ideas if this would be an issue or not anyone? __________________ COMP: Dual Intel PIII 733 Mhz; GeForce 4 Ti 4600; 1.128 Gb RAM; SB0350 (Audigy 2 ZS Platnium) STEREO(I UPGRADED):Crown Audio K1 and K2 amplifiers (4000 watts at .1% THD ), JL 13w7 Subwoofer (6.5 CF) (2) 18" PR's, Klipsch SB-1's, some cement blocks for speaker stands... Last edited by Chester01; Dec 24, 2004 at 02:07 AM.

Dec 24, 2004, 03:42 AM	Thread Starter #2
Chester01 HardwareHeaven Senior Member Join Date: Jan 2004 Location: St. Cloud, MN Posts: 492 Rep Power: 0	a slightly better/different drawing of it http://n.1asphost.com/Chesteta/sono4.JPG __________________ COMP: Dual Intel PIII 733 Mhz; GeForce 4 Ti 4600; 1.128 Gb RAM; SB0350 (Audigy 2 ZS Platnium) STEREO(I UPGRADED):Crown Audio K1 and K2 amplifiers (4000 watts at .1% THD ), JL 13w7 Subwoofer (6.5 CF) (2) 18" PR's, Klipsch SB-1's, some cement blocks for speaker stands...