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Old 26th October 2005, 10:28 AM   #1
maf_au is offline maf_au  Australia
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Default 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
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Old 26th October 2005, 11:38 AM   #2
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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).
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Old 26th October 2005, 11:49 AM   #3
rabbitz is offline rabbitz  Australia
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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.
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Old 26th October 2005, 02:23 PM   #4
GM is offline GM  United States
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Greets!

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

GM
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Old 27th October 2005, 12:15 PM   #5
tcpip is offline tcpip  India
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Default Re: Bass Reflex Port: 46mm where to buy?

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.
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Old 27th October 2005, 12:30 PM   #6
fury is offline fury  Australia
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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.
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Old 28th October 2005, 02:19 PM   #7
rabbitz is offline rabbitz  Australia
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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.
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Old 28th October 2005, 02:43 PM   #8
sachi is offline sachi  United States
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Default Re: Re: Bass Reflex Port: 46mm where to buy?

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.
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Old 28th October 2005, 02:58 PM   #9
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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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Old 28th October 2005, 08:41 PM   #10
maf_au is offline maf_au  Australia
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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
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