SoundDomain: Straws in a Port??

You are not logged in. [Log In] SoundDomain » Forums » Home Audio & Entertainment » Sonic Solutions » Straws in a Port??

Page 1 of 1

Topic Options

Rate This Topic

#1448815 - 28/07/08 03:37 PM

Straws in a Port??

veedubb8
SD Editor
Administrator

Registered: 19/08/02
Posts: 2007
Loc: Seattle, WA

Offline

OK, building speakers is definitely a cool project, but what's up with putting straws in your port???

http://www.popularmechanics.com/technology/how_to/4274625.html?page=3

_________________________
2003 GTI 1.8T
Kenwood LZ800 & Nav/Addzest DRX-9255/MB Quart QSD 3-way/Autotek 5.1 Amp/Illusion Audio ND-10
OEM HIDs/Shaved Hood & Bumper/FK Badgeless Grille/18" BBS RC/APR 91 Chip/APR Turboback/Samco DV/H&R Premium Coilovers/Carbonio CAI/Samco Hoses/PowerSlot Slotted Rotors/Goodridge Stainless Lines
http://www.cardomain.com/id/veedubb8

Top

#1448821 - 28/07/08 03:41 PM

Re: Straws in a Port?? [Re: veedubb8]

veedubb8
SD Editor
Administrator

Registered: 19/08/02
Posts: 2007
Loc: Seattle, WA

Offline

OK, I read a little deeper rather just looking at the pretty pictures and found this:
"There's an odd bit of business in the kit's instructions about filling the rear-firing port tube with several dozen plastic straws that confused me at first, but a call to North Creek revealed that the straws help fine-tune the speaker's low-end bass limit."

So the straws act as a subsonic filter?

Top

#1450120 - 29/07/08 09:20 PM

Re: Straws in a Port?? [Re: veedubb8]

keep_hope_alive
Snooch to the Nooch
SD I chew on Mike Tyson's ear

Registered: 24/04/07
Posts: 8658
Loc: Quad Cities, IL

Online

did you see the Mythbusters episode where they made a wind tunnel by putting thousands of bundles of straws in front of a fan? it helped direct the air and reduce turbulence, if i recall. i suppose it would do the same thing but should your port calculation be adjusted to include a large number of long, small diameter ports?

_________________________
Don't believe everything you read on an internet forum. Look into the mouth of a person and you'll find lies, wriggling there like maggots, waiting to grow wings. The world has gone mad.

Never Forget This Advice

A lifetime of learning awaits anyone with the will and desire.
Wanna know more? Links and References
My 2001 Accord EX V6 on Car Domain
Check my recent progress in SD Show Off

Top

#1450121 - 29/07/08 09:22 PM

Re: Straws in a Port?? [Re: keep_hope_alive]

keep_hope_alive
Snooch to the Nooch
SD I chew on Mike Tyson's ear

Registered: 24/04/07
Posts: 8658
Loc: Quad Cities, IL

Online

maybe a large number if small diameter ports resists air flow at subsonic frequencies, i'm just guessing here without actually looking for information to back that up.

i guess the fastest evaluation would be to do a couple plots in bassbox or some other sub box software.

Top

#1450153 - 29/07/08 10:25 PM

Re: Straws in a Port?? [Re: keep_hope_alive]

cal_bot
Resident SD Hippy
SD Player to be named later

Registered: 19/02/08
Posts: 1174
Loc: Berkeley, CA

Offline

I don't see why this is used. Shapes like this are used to keep a fluid laminar (non-turbulent). I think the effects might be negated by the opportunity for whistle around each edge, but I dunno $\:confused\:$

_________________________
"don't use my name in your dumbass posts." --SQL Altima

Top

#1450557 - 30/07/08 10:34 AM

Re: Straws in a Port?? [Re: cal_bot]

veedubb8
SD Editor
Administrator

Registered: 19/08/02
Posts: 2007
Loc: Seattle, WA

Offline

I might try it in my Focal 5Ws box. It has a bit of port noise, so maybe this will help? Worth a shot. I woudl think that that many straws woudl change the parameters even though they are really thin.

Top