Telescopic PVC exhaust pipe bass transmission lines? - diyAudio
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Old 4th August 2004, 11:51 AM   #1
VvvvvV is offline VvvvvV  United Kingdom
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Join Date: Oct 2003
Location: oxfrd
Default Telescopic PVC exhaust pipe bass transmission lines?

Do you think it is possible to get some PVC drainpipe material of different widths and attach them to a vent in a normal speaker in a telescopic transmission line kind of way, so that you could tune the length of the line until it is just right?
With decent proportions, it could look and sound quite good probably?
Any variations on the idea?
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Old 4th August 2004, 03:21 PM   #2
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Join Date: Jan 2004
Location: Toronto, ON, Canada
You'd just end up with a semi-dipole enclosure, IMHO.
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Old 4th August 2004, 08:46 PM   #3
Shpoop is offline Shpoop  United States
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or you could do soemthing like this...kinda hard to tell from the picture, but it is spiraling, and you can add extra quater-circles to tune it... maybe it wouldnt be exact but it could be pretty darn close
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Old 5th August 2004, 12:59 AM   #4
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Location: Western Sydney
Default It's been done...

I think on the Full Range forum site someone has made transmission lines out of PVC,

Also, someone has made a spiral horn inside a PVC pipe using different sized fittings for the mouth,

not to mention my own K-slotted broadband resonant pipe :-)

Pete McK
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Old 5th August 2004, 03:05 AM   #5
VvvvvV is offline VvvvvV  United Kingdom
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Join Date: Oct 2003
Location: oxfrd
That's some nice work, i'd like to do the same thing with the drivers held in cement.
In my mind I was thinking of something that's a cross between a speaker and a Yankee freight truck with some vertical exhaust pipes. Perhaps even an oil refinery look.

I was thinking that the drainpipe tubes I have in the Garden have a drainpipe echo sounder at the moment, I think PVC tubes are probably best used extra rigid with very fixed ends for a truly dead weight.

Spirals sound interesting, although I'd be most interested in trying to mould a corkscrew like the bronze corkscrews used to irrigate the hanging elevated gardens of Babylon. The methods used for moulding are mysterious, although there are some theories about effective spiral creation methods.
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Old 5th August 2004, 06:57 AM   #6
JohanH is offline JohanH  Netherlands
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Join Date: Dec 2003
Location: Noord Brabant
Default You mean something like this?

IIRC, it's a Daline-type enclosure published in the dutch magazine Audio & Techniek. The Woofer connects to the inner tube which ends near the bottom of the outer tube. Exit points are the squares you see below the tweeter.

Audio & Techniek published several designs based on PVC tubes.
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