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Concrete Speakers-Way Better Than I Expected.

FireGuruMN said:
Finished product:
View attachment 2000012
Now as always with my previous post of "strange" speaker builds I have to get the obvious jokes out of the way before everyone adds their own:
They have a very solid sound.
Very good for playing rock music.
Very durable finish.
Ok, that's all I got for now. Have at it.

The sound out of these is wonderful. Probably mostly due to the fabulous Tang Band W4-1337SDF driver.
View attachment 2000015
I suspect that they would sound pretty much as good with some solid MDF enclosures but you probably would not even still be reading this if they were MDF enclosures. Just saying.

Here is the process:

Continued. . .
Click to expand...
Not that suprised. The Status Acoustics (RBH) uses a granite cabinet along with Uber advanced sound deadening in side. Best bookshelf made.
 
ernieS said:
Status Acoustics (RBH)
Click to expand...
Not exactly. From their website:
Status loudspeaker enclosures are formed from a multi-fiber composite material featuring a beautiful natural stone appearance. But still cool.

I recall looking at this website during my research. It convinced me to use fine aggregate in the concrete although the cracks do add interest.
https://hackaday.com/2019/05/17/yet-another-concrete-speaker-build/

These guys have it all figured out:
https://www.concrete-audio.com/en/#standlautsprecher_n1
Except for antigravity coating. 176 pounds for the tower speakers! 4435's are only 250 pounds and they are hard to beat. You can look at their pricing but let's just say I won't be buying in bulk. . .

My manager would kill me but SAFETY LAST:
Concrete dust is nasty to inhale. Wear a mask.
Concrete also dries your hands out quickly. Wear gloves or there are some lotions that can be applied to prevent moisture extraction also. Gloves are easy.

I also researched some sort of sealer to keep stains and such out of the concrete. Everything I found darkened the appearance significantly and that was not acceptable to me. Maybe just some polyurethane? I'll have to experiment on some of my failures and see where it goes. Just handling them will dry your hands out still.
 
Last edited by a moderator:
FireGuruMN said:
Not exactly. From their website:
Status loudspeaker enclosures are formed from a multi-fiber composite material featuring a beautiful natural stone appearance. But still cool.

I recall looking at this website during my research. It convinced me to use fine aggregate in the concrete although the cracks do add interest.
https://hackaday.com/2019/05/17/yet-another-concrete-speaker-build/

These guys have it all figured out:
https://www.concrete-audio.com/en/#standlautsprecher_n1
Except for antigravity coating. 176 pounds for the tower speakers! 4435's are only 250 pounds and they are hard to beat. You can look at their pricing but let's just say I won't be buying in bulk. . .

My manager would kill me but SAFETY LAST:
Concrete dust is nasty to inhale. Wear a mask.
Concrete also dries your hands out quickly. Wear gloves or there are some lotions that can be applied to prevent moisture extraction also. Gloves are easy.

I also researched some sort of sealer to keep stains and such out of the concrete. Everything I found darkened the appearance significantly and that was not acceptable to me. Maybe just some polyurethane? I'll have to experiment on some of my failures and see where it goes. Just handling them will dry your hands out still.
Click to expand...

There have been different iterations of the bookshelf. The Granite is the latest version (worked there :)). The prior cabinet was the incredibly inert stone looking material. The model on KSL.com has 3/4” thick granite walls along with space age Uber dampening system glued to the rock walls.
 
Very cool! What about getting some concrete sealer? Like what they use on the concrete floors at big box stores and home depot?
It would help stabilize the surface and give them a nice semi gloss or semi flat look.
 
Hmmm
Stoner speakers...
Well, at the very least you can claim they don’t sound like dirt!!
 
FireGuruMN said:
I have:
2 18" drivers
4 12" drivers
3 horns with drivers
1 midrange with 8" driver
These were saved from the dumpster by another person during an upgrade of the theater. I can't speak to where the enclosure went but I suspect they would not fit in the car this guy had available. They would not be suitable for a home system regardless.
But let's save the rest of this conversation for another thread please.
Click to expand...

What brand drivers? Pics?

This is an entertaining thread, thank you.
 
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