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Old 12th February 2008, 09:48 PM   #1
hahfran is offline hahfran  Germany
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Default Voigt tapered pipe as subwoofer

After a mere 10 years another room of my old huge home is now ready to move in. For purpose of symmetry I need a rectangular pillar of about 2.5 meters height and I think that could be a Voigt pipe subwoofer. My plan is to have two 10 in drivers in push-pull.
However there may be severe problems with resonances and in general instability of a construction of such dimensions if it is made of MDF or of 14 layer birch plywood. Another option is concrete with steel inlay. Anyone out there an idea?

Dieter F.
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Old 13th February 2008, 02:54 AM   #2
GM is offline GM  United States
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Since it would be a subwoofer, steel with angle iron bracing would be ideal since its Fs would be well above the intended passband and capable of supporting a heavy load.

GM
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Old 13th February 2008, 08:54 AM   #3
hahfran is offline hahfran  Germany
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For mobile homes a compound of two layers of aluminum with
some sound dampening material between the layers ( looks pretty much like Bofoam ) has been used.
Would that be ok., too?
Thanks.
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Old 13th February 2008, 01:54 PM   #4
ion is offline ion  Sweden
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Personally I think that wood bracing is a good option. Easy to work with and high stiffness-weight ratio. Also remember that wood is a organic material which grows/shrinks with temperatur/humidity different from metal.

If I'd build a 2.5 meter basspipe I'd go with plywood with internal spruce bracings. Of course, in the end it is highly individual which materials one favors to work with. Whichever way you choose I wish you the best of luck

/Jon
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Old 13th February 2008, 04:38 PM   #5
GM is offline GM  United States
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Quote:
Originally posted by hahfran
........looks pretty much like Bofoam........
Don't know. Frankly, unless you're wanting to support a concrete ceiling, then either braced or double thick 19 mm Baltic Birch plywood construction will get the job done.

GM
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Old 13th February 2008, 09:43 PM   #6
hahfran is offline hahfran  Germany
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Ok birch plywood is available up to 26 mm. Not sure what braced refers to. Thanks.
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