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In the Forum: Horn-Loaded Speakers
In the Thread: Deep End DIY - Australian take one Macondo.
Post Subject: Metal pipesPosted by Jorge on: 7/4/2017
Hello Anthony,
I did experiment with metal tubes for bass in a sealed configuration as you are planning. The weight of them, even made out of thinner than you would like steel, is prohibitive.  If you make them out of aluminum pipe, then it could be better, but still pretty heavy.  The stack will probably be unstable and shakey.
Do not try to place them one further than the other, or not perfectly aligned,  the bass will distort terribly, cancellations will cause a mess of the sound, remember they will be playing the exact same frequency. (I did that and learned from the experience)
Of course they look much better than the boxes with the added benefit of difussion of sound waves hitting on it, against the reflection from a flat side panel of a box, so there are a lot of considerations you must make.
The bass modules I am using now are actually a form of concentric tapped horns using a long excursion 8 inch woofer servocontrolled by a powerfull class D amp.  These are a redesign from the original, longer, passive bass modules which sported a 6.5 inch woofer.   I am using one per side now. 

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