Concrete Audio Speakers...Speaker Enclosures made out of Concrete ?..

I've heard a round (actually grout) underground vault. It had 4 18" pipe intersections. It was bell shaped. Two were blocked, top was a manhole cover. No bottom, just sat in the sand. This was not concrete, no rock, just fiberglass strands about 4-6" long and an epoxy/grout mix.

2 pro 15" drivers. It had an interior of 20 CF and 1500 pounds or so. It rang so bad, I had to spray the interior with expanding foam.  It bassed  up the whole 2 acre yard. 

A column of Corian at 5/8 thick 18" x 20 x 72" with little bracing will hit a 1/2 ton.. pretty quick. Just a front baffle of @Corian and sides of MDF 550-600 lbs

I'm dealing with 410 lb each, NOW.. With HDF/MDF 

Concrete is the heaviest because of the BIG rock, a lot of weight. Also tough to pump. Light grout mixes that are made with accelerators, can fluff to about HALF concretes weight. Fiberglass, Stainless all kinds of stuff go in the mixes.

Regards

roxy543,400 posts08-29-2020 5:53amoldhvymec,
There are at least 3 companies that have used granite for speaker enclosures that I can think of, so there are probably more.

I know, that's what they say, and it may be true. But roxy54 check it out
Granite rings like a bell, ATH @ Corian is what every expensive countertop, speaker baffle and TT plinth are made of. You can even glue and repair the stuff. NOT granite. Granite is pretty cheap in comparison.

Really it's hard to work with, HEAVY, and just a horrible sonic signature.

Regards

kenjit1,013 posts08-12-2020 10:37am

How will the speaker shaped by kenjit sound?

If I had a speaker company my speakers would have to be perfect. No ringing or resonances. Just pure music.


Me, the dog, the rabbit, and the GOAT, all of our heads, cocked sideways. The chickens didn't though. BOING!

NO RESONANCES, either... hum! At least some ok..
Something gotta come out of the front of the speakers, just saying K!

;-)

Regards

audiotroy2,546 posts08-16-2020 12:26am

Kenjit is wrong concrete. Does not resonate the issiue is weight and ability to ship without damage

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My oh my, I don’t think he is, but I do think you are... CONCRETE is REAL bad.... GROUT mixes on the other hand.. quit good.. Concrete is WAY to heavy because of the rock type and size. Grout on the other hand, less than half the weight (depending on the fluff) and can have a very DEAD signature..

Again NO ONE uses, granite. You cannot use granite. They use synthetic granite, ATH @ Corian... Granite, basite, any igneous rock will ring... It has a very low concentration of silica. The baffle mix has to have a high porosity (bubbles in the mix, but no voids) Igneous rock, is a NO NO..

Some naturally occurring sedimentary, looks good and can work, but has no strength..

Metamorphic, changes under great heat, pressure and TIME. It’s out...
just like Igneous, way to dence, very difficult to work with, without some pretty fancy tools.. The weight, out of sight!! the heaviest of all, ay?

Try cutting 3-20 driver holes, praying the whole time, hole # 10 won’t have a problem, much less # 20..
Now lets add an OOPS or two in the mix... :-)

Regards