Finally finished a concrete enclosure for a new sub. It was a pleasure to do something with a material that's not plywood or MDF.
Here's the link: An Unconventional Sub
Here's the link: An Unconventional Sub
What is the resonant frequency of the cab?
Fired clay will simply not resonate at those frequencies. Concrete will.
16"x20" Logan Clay Flue Liners - 2' Lengths – Lange's Warehouse
surround one of these with a cap on either end and bob's yer uncle.
I had a problem with my subs transferring into the floor so I got a 2" thick clay patio stone under each and it literally eliminated it.
Fired clay will simply not resonate at those frequencies. Concrete will.
16"x20" Logan Clay Flue Liners - 2' Lengths – Lange's Warehouse
surround one of these with a cap on either end and bob's yer uncle.
I had a problem with my subs transferring into the floor so I got a 2" thick clay patio stone under each and it literally eliminated it.
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Looks good: very crisp finish.
One way to avoid tear-out is to use a layer of wax.
I once made concrete tweeter pods. I made the mold by lining the inside of a timber box with a layer of candle wax; I used tape to make a dam, and poured hot, liquid wax approx 2mm deep onto each internal surface.
Once the concrete had set, I warmed it up (by putting the whole box into the oven), and the pods came out cleanly.
Another way to get a stronger mix:
Fiber-reinforced concrete - Wikipedia
I've picked some up from Barnes (art supplies), or you can get it online. One bag of chopped fiber goes a long way.
One way to avoid tear-out is to use a layer of wax.
I once made concrete tweeter pods. I made the mold by lining the inside of a timber box with a layer of candle wax; I used tape to make a dam, and poured hot, liquid wax approx 2mm deep onto each internal surface.
Once the concrete had set, I warmed it up (by putting the whole box into the oven), and the pods came out cleanly.
Another way to get a stronger mix:
Fiber-reinforced concrete - Wikipedia
I've picked some up from Barnes (art supplies), or you can get it online. One bag of chopped fiber goes a long way.
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Your ability to finish concrete is very impressive.
If those photographs are realistic I would not want to place anything on them.
After all of the trouble you went to with this I cannot think of a worse material than mdf for your driver attachment. I must admit I did not read the thing all of the way through maybe you sealed, and I mean REALLY sealed those mdf pieces - but it would seem an obvious place for marine grade plywood and it, too, would need to be sealed.
mdf is crumbly enough without the danger of the residual moisture from the concrete doing what it does to mdf.
Nonetheless, a very impressive result.
If those photographs are realistic I would not want to place anything on them.
After all of the trouble you went to with this I cannot think of a worse material than mdf for your driver attachment. I must admit I did not read the thing all of the way through maybe you sealed, and I mean REALLY sealed those mdf pieces - but it would seem an obvious place for marine grade plywood and it, too, would need to be sealed.
mdf is crumbly enough without the danger of the residual moisture from the concrete doing what it does to mdf.
Nonetheless, a very impressive result.
Related to this idea of using concrete, and maybe someone has already tried, but ‘Thermalite’ aerated/foamed concrete blocks, especially foundations blocks, are easy to carve and hollow out so could be used for smaller speaker enclosures. Good acoustic and thermal properties as well.
I have used these blocks for sculptural projects in the past. Nice to use. Foundation blocks are never sold individually though so difficult to get hold of.
I have used these blocks for sculptural projects in the past. Nice to use. Foundation blocks are never sold individually though so difficult to get hold of.