Bass Reflex Port: 46mm where to buy?

maf_au · 26th October 2005, 10:28 AM

Hi.

I'm embarking on a speaker project that specifies 46mm ID ports, and I have to admit, I'm having trouble finding any.

I'm in Australia, and I'll be down the hardware and plumbing supplies soon with my calipers, but I haven't been able to find anything matching online yet.

Any ideas?

Thanks,

Michael

Geek · 26th October 2005, 11:38 AM

I'd just go with some standard 51mm I.D. ABS and use some calc to se how many mm you need to add to the length (if you have room).

rabbitz · 26th October 2005, 11:49 AM

Just recalculate the port diameter and length to suit what you can get. If you put the existing numbers in WinISD, play with the Vb, port dia, port length, you can then find the Fb (box tuning frequency).

Just change the port dia to what you can get, and the new length will appear.

Use something like WinISD or what ever you have.

GM · 26th October 2005, 02:23 PM

Greets!

Or just make some square or rectangular ones with the same cross sectional area out of scrap wood.

GM

tcpip · 27th October 2005, 12:15 PM

Quote:

Originally posted by maf_au
I'm embarking on a speaker project that specifies 46mm ID ports, and I have to admit, I'm having trouble finding any.

This has been a non-issue for me from the time I built my first BR enclosure. See here for a description of what I do. You may find Australia a tough place for odd-diameter ducts, but I'm in India, and I guess it's just as hard here.

fury · 27th October 2005, 12:30 PM

Jaycar sell 50mm adjustable ports.
This is pretty close to what you're after so might be worth checking out.
Otherwise head down to bunnings/mitre 10 or your favourite hardware store and check out there plumbing section.

rabbitz · 28th October 2005, 02:19 PM

WES Components do sell a 45mm x 128 port (Code PT760) which would be close enough.

It's flared one end and fits in a 68mm hole.

sachi · 28th October 2005, 02:43 PM

Quote:

Originally posted by tcpip

This has been a non-issue for me from the time I built my first BR enclosure. See here for a description of what I do. You may find Australia a tough place for odd-diameter ducts, but I'm in India, and I guess it's just as hard here.

Actually what is supposed to be 2 inch PVC pipes in India are perfectly 46 mm in diameter..
That's what i have used in my active speakers.

Skitch72 · 28th October 2005, 02:58 PM

L2 = L1*(D2^2/D1^2)+(D2-D1)^2

I was in the same situation (but going from metric to english units) and got this formula from someone here.

L1 and D1 = the original length and diameter
insert the new diameter D2 and solve for the new length.

Its worked for me

Tim

maf_au · 28th October 2005, 08:41 PM

Hey!

Thanks for all the useful hints and tips!

I'll be off down to the hardware store today with a ruler to see what I can find...

Michael

26th October 2005, 10:28 AM	#1
maf_au diyAudio Member Join Date: Jun 2005 Location: Adelaide	Bass Reflex Port: 46mm where to buy? Hi. I'm embarking on a speaker project that specifies 46mm ID ports, and I have to admit, I'm having trouble finding any. I'm in Australia, and I'll be down the hardware and plumbing supplies soon with my calipers, but I haven't been able to find anything matching online yet. Any ideas? Thanks, Michael __________________ My AudioProjects Gallery

26th October 2005, 02:23 PM	#4
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	Greets! Or just make some square or rectangular ones with the same cross sectional area out of scrap wood. GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

28th October 2005, 08:41 PM	#10
maf_au diyAudio Member Join Date: Jun 2005 Location: Adelaide	Hey! Thanks for all the useful hints and tips! I'll be off down to the hardware store today with a ruler to see what I can find... Michael __________________ My AudioProjects Gallery

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26th October 2005, 11:38 AM	#2
Geek diyAudio Member Join Date: Sep 2004	I'd just go with some standard 51mm I.D. ABS and use some calc to se how many mm you need to add to the length (if you have room).

26th October 2005, 11:49 AM	#3
rabbitz diyAudio Member Join Date: Jul 2003 Location: Newcastle, Australia	Just recalculate the port diameter and length to suit what you can get. If you put the existing numbers in WinISD, play with the Vb, port dia, port length, you can then find the Fb (box tuning frequency). Just change the port dia to what you can get, and the new length will appear. Use something like WinISD or what ever you have.

27th October 2005, 12:30 PM	#6
fury diyAudio Member Join Date: Apr 2005 Location: aus	Jaycar sell 50mm adjustable ports. This is pretty close to what you're after so might be worth checking out. Otherwise head down to bunnings/mitre 10 or your favourite hardware store and check out there plumbing section.

28th October 2005, 02:19 PM	#7
rabbitz diyAudio Member Join Date: Jul 2003 Location: Newcastle, Australia	WES Components do sell a 45mm x 128 port (Code PT760) which would be close enough. It's flared one end and fits in a 68mm hole.

28th October 2005, 02:58 PM	#9
Skitch72 diyAudio Member Join Date: Jan 2004 Location: Indiana	L2 = L1*(D2^2/D1^2)+(D2-D1)^2 I was in the same situation (but going from metric to english units) and got this formula from someone here. L1 and D1 = the original length and diameter insert the new diameter D2 and solve for the new length. Its worked for me Tim

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