Concrete enclosures.

[Lectoid]

Anyone ever heard about this or done it?

http://translate.google.com/translate?u=http%3A%2F%2Fpropirate.net%2Fbetonboxen%2F&langpair=de%7Cen&hl=en&ie=UTF-8&oe=UTF-8&prev=%2Flanguage_tools

[ThomasW]

Concrete is too lightweight and it's for amateurs. I make all my enclosures from depleted uranium....

[gitarretyp]

Bah, degenerate neutron gas is where enclosure design is heading :T

[jquin]

I have seen some egg shaped speakers made from concrete.
The guy made a shape out of wire mesh the kind used in small aviarys I think it was small hexagons about 1/8" in size. Anyway you approximate the shape and then apply the concrete.

The finish was not very accurate however. Not a look to please everyone.

I have heard of others boxing up frames to make sub-woofers out of concrete. Again surface finish is an issue.

What might look good if you have the time/equipment/desire is to grind/polish off the surface with diamond wheel. That would look a but like polished marble. To that end you might want to apply an external layers of decorative concrete with white stone aggregate and a color powder in with the cement powder. When polished that would look excellent. Absolute flatness of the finish would be an issue however esp without special equipment.

[Gir]

Hmmm, that was just posted on hackaday a few days ago...

Anyways, I have also heard of some people who used concrete in their subs, but I think you would only really want to use concrete for small speakers as I would imagine lifting a 300-400 pound subwoofer wouldn't be fun.

[Lindahl]

I believe GrahamT coated the interior of his Extremis MTs with concrete. Not quite the same, of course. Although moderately small bookshelfs, they came out to 50lbs each, if I remember.

[peterS]

omg concrete htib!
:crazy:

[Brandon B]

One of the guys I work with made a concrete guitar while we were working here in Tokyo. He took it into a store to buy tuning machines for it, and the clerks were rather frightened of him.

He is one of the designer/sculptors who do our façades and rockwork.

It actually played, although he didn't give it high marks for tonal quality.

BB

[Brandon B]

Bah, degenerate neutron gas is where enclosure design is heading :T

Yeah, but the corresponding signal processor to compensate for the gravity induced doppler shift is so expensive!

BB