Voigt tapered pipe as subwoofer

hahfran · 12th February 2008, 08:48 PM

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.

GM · 13th February 2008, 01:54 AM

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

hahfran · 13th February 2008, 07:54 AM

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.

ion · 13th February 2008, 12:54 PM

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

GM · 13th February 2008, 03:38 PM

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

hahfran · 13th February 2008, 08:43 PM

Ok birch plywood is available up to 26 mm. Not sure what braced refers to. Thanks.

12th February 2008, 08:48 PM	#1
hahfran diyAudio Member Join Date: Dec 2007	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.

13th February 2008, 01:54 AM	#2
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	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 __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

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13th February 2008, 07:54 AM	#3
hahfran diyAudio Member Join Date: Dec 2007	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.

13th February 2008, 12:54 PM	#4
ion diyAudio Member Join Date: Jan 2007	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

13th February 2008, 08:43 PM	#6
hahfran diyAudio Member Join Date: Dec 2007	Ok birch plywood is available up to 26 mm. Not sure what braced refers to. Thanks.

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