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Budget Subwoofer

matteos said:
You're going to need to post pics!!!
Click to expand...

The amps and the active crossover (sound source is an ancient Archos hdd mp3 player)

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The horn loaded 18" driver

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Build time pics:
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kuva5i.jpg

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kuva3h.jpg

kuva2w.jpg

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Nice build Boonie. I wonder if that sub wouldn't benefit from some interior dampening, especially the metal panel. I imagine it would resonate quite a bit. Line the inside cabs with bitumen or acoustic foam. If you got some non drying wax or oil based modelling clay you could dampen the metal part quite a bit.

I bet that thing plays loud as hell.
 
matteos said:
Nice build Boonie. I wonder if that sub wouldn't benefit from some interior dampening, especially the metal panel. I imagine it would resonate quite a bit. Line the inside cabs with bitumen or acoustic foam. If you got some non drying wax or oil based modelling clay you could dampen the metal part quite a bit.

I bet that thing plays loud as hell.
Click to expand...

Nah that steel is 1mm thick and it doesnt resonate at all when you knock it. It's supported by multiple supports, glued from the sides and partly also with damped polyurethane cells. Also the round shape of the horn actually increases structural integrity. This is also partly why car chassis usually contains rounded shapes or kinks instead of flat surfaces. The original plans are made with sharp angles and mdf / veneer board but since we had metal working tools available we chose the optimal round shapes steel can provide. Whenever you subject a horn to a sharp angle it loses some efficiency and linearity! That's why you don't see trumpets with square corners ;)

The horn driver does not require any damping material inside the enclosure. The compression drivers work somewhat differently compared to regular drivers. Regular mid-bass woofers require rear volume damping to kill resonances and mid-level reflections. The range of this driver is 40-200hz however so there are no standing waves inside the rear enclosure. The max excursion at highest sustainable SPL is like 10% or less from a traditional boxed speaker.

The speaker can produce enough SPL to fill a medium size dance hall all by itself (handled my sisters wedding without breaking a sweat) - for live outdoor concerts sets of 4-6 are used. Just one is enough for my garden however.

When turned to full volume it can make the tools fall off from my garden shed - but at those volumes we have to hide behind the main building or wear hearing protection. Even with hearing protection if you stand in front of the driver long enough it will mess up your stomach. At moderate 90-100db peak levels the driver produces super dynamic body thumping bass outdoors. When the driver is linear and dynamic you don't even have to play very loud.

The good experience with this 50hz bass horn has made me plan for a 20hz horn to my listening room. That should be something special. There's some italian dude who already did something like this: http://www.royaldevice.com/custom.htm
 
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Yeah the subwoofer under the friggin house build. That one is just oh my goodness over the top. I think he is trying to contact other dimensions with that sucker.
 
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