Not an original idea, but I have a loose Peerless XXLS and Hornresp and the urge to experiment. As others have known, I am unconventional and explore Carpentry-Free(TM*) building methods. (My recent Ijit Mark I Tampered Horn notwithstanding).
* Not really, but it sounds cool.
I've found a few interesting (and mostly very old) threads here about using cardboard for speakers. There is the ongoing "foam core" thead. Most of them are for smaller speakers. I say, why not go for broke? I'm not proposing an intricate cardboard horn (yes there's one in here somewhere!). How about this for a test? I graciously volunteer to be the guinea pig.
Design the "simplest" enclosure (sealed?) for my sub Peerless 830845
http://www.tymphany.com/files/XXLS-P830845 Rev1_0.pdf
I'm assuming I can build a smallish one (all the better to test for enormous internal pressures). Why not out of a cardboard box? Suitably braced? (Ah, there is the devil in the details...how?) Whatever is available and cheap. Why not dowels and epoxy cross braces, or even just caulked? Due to the mass of the driver, I envision just leaving it face-up on the floor and caulk the box on top of it. Just like Pass's "El-pipe-o" except a box instead of a big tube 🙂
What's to lose? Should not take long, and worst case I make a extra large version of those paper balloons we made when we were kids.
* Not really, but it sounds cool.
I've found a few interesting (and mostly very old) threads here about using cardboard for speakers. There is the ongoing "foam core" thead. Most of them are for smaller speakers. I say, why not go for broke? I'm not proposing an intricate cardboard horn (yes there's one in here somewhere!). How about this for a test? I graciously volunteer to be the guinea pig.
Design the "simplest" enclosure (sealed?) for my sub Peerless 830845
http://www.tymphany.com/files/XXLS-P830845 Rev1_0.pdf
I'm assuming I can build a smallish one (all the better to test for enormous internal pressures). Why not out of a cardboard box? Suitably braced? (Ah, there is the devil in the details...how?) Whatever is available and cheap. Why not dowels and epoxy cross braces, or even just caulked? Due to the mass of the driver, I envision just leaving it face-up on the floor and caulk the box on top of it. Just like Pass's "El-pipe-o" except a box instead of a big tube 🙂
What's to lose? Should not take long, and worst case I make a extra large version of those paper balloons we made when we were kids.
Even with extensive bracing it's going to "breathe" along with the driver, the walls will flex and it will probably fall apart (or at least fall over) under it's own weight.
Both of you are no doubt right. Never the less, I am obstinate! Can someone give me dimensions of a suitable sealed box? I only know how to design tapped horns 🙂
This should be a fun experiment. Costs almost nothing, I can probably get a ready-made box (have in stock, even), and can get all sticky with adhesives trying to brace the darn thing 🙂
This should be a fun experiment. Costs almost nothing, I can probably get a ready-made box (have in stock, even), and can get all sticky with adhesives trying to brace the darn thing 🙂
Hornresp does sealed boxes too, it's really easy. Just fill in driver specs, Vrc and Lrc and go.
If you want a recommendation, it depends what you want to do. Anywhere from tiny to infinite will work.
This guy has a bunch in 65 liter boxes - FoLLgoTT's build: 18 x Peerless XXLS12
And here's another thread similar to this one - View on the Peerless XXLS P830845 | AVForums
Doesn't really matter though, this driver is going to rip your little cardboard box apart (probably before you even get it mounted). Have fun.
Guy, thanks! You are probably right about impending self-destruct. In some matters I am empirical which I think means "let's try this and see." If it works, very likely I will end up with a structure that weighs the same a sturdy wooden box would have.
Bjorno, would you have that project as a Hornresp file? It would be a good learning experience for me to play with it.
Yes you can make it out of cardboard, and no more difficult than a car or boat, doing it correctly is of course a different matter 😉
I would suggest to read up on panel vibration as like in the old days utilizing the rear wave through a lossy panel can be beneficial if implemented properly.
If this utilizes multiple constrained layers could be better than a "sturdy wooden box"
Just swap out the library paste for a dampening compound in a layer or two. Very hard finish to medium (paper, cardboard etc), to soft (dampening) to medium (paper, cardboard etc), to hard finish would be a minimum. The soft dampening layer is thinner than you think. Need more dampening/stiffness, add additional layers.
I have not yet found a better glue for papier mache than PVA wood glue, thinned 50% with water. Use ordinary paper for the outer layers, and embossed paper towels for the inner layers.
That sounds like a good method for building huge horns. From much reading here at diyaudio and elsewhere, I'm aware that hobbyists have built (relatively) small horns out of foam board and I think in some cases, traditional huge horns out of papier-mache and even cardboard. I was hoping that I could simplify this to the case of the ordinary cardboard box and ordinary subwoofer. However it appears the laws of physics may be conspiring against me 🙂
I think the main problem with trying to make a subwoofer enclosure is that the material must be very (not sure of the correct term--) stiff and unyielding at the low frequency and high pressures that occur. Of real-world materials, although probably only with difficult methods of assembly, probably one could make an excellent sub enclosure out of even thin ceramic tile. Hmmm...they sell it in small squares, why not 4'x8' sheets...? I have read, seen photos of concrete horns. In the realm of the impractical, somewhere there is a bricklayer who took the time to make a built-in subwoofer 🙂 Hope his design was correct!
I think the main problem with trying to make a subwoofer enclosure is that the material must be very (not sure of the correct term--) stiff and unyielding at the low frequency and high pressures that occur. Of real-world materials, although probably only with difficult methods of assembly, probably one could make an excellent sub enclosure out of even thin ceramic tile. Hmmm...they sell it in small squares, why not 4'x8' sheets...? I have read, seen photos of concrete horns. In the realm of the impractical, somewhere there is a bricklayer who took the time to make a built-in subwoofer 🙂 Hope his design was correct!
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Hi Soldermizer,
Post #14: "...the laws of physics may be conspiring against me..."
You could find an exercise ball (e.g.: Met RX 55cm Exercise Pilates Yoga Balance Fitness Ball with Pump | eBay), and apply your paper mache too it. That would be a strong shape - may the force be with you. 🙂
Regards,
Post #14: "...the laws of physics may be conspiring against me..."
You could find an exercise ball (e.g.: Met RX 55cm Exercise Pilates Yoga Balance Fitness Ball with Pump | eBay), and apply your paper mache too it. That would be a strong shape - may the force be with you. 🙂
Regards,
Hmmm....I've gotten some of the siller ideas out of my system (such as last weekend's build of a Tapped horn with few/no plans...). I now have a useless cabinet and sadly, bonefires are not legal where I live 🙂
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