Polymer concrete as an enclosure material?

[Hyvok]

Has anyone ever used polymer concrete (ie. epoxy and stones/gravel/sand forming a very strong composite, also called synthetic marble) as a speaker enclosure?

I'm not a mechanical engineer but I think it should make a great material for subwoofer enclosures. It weighs alot (about 2200kg/m^3 depending on a lot of factors) and due to its structure it dampens vibrations very well (someone even said its "acoustically inert"). These sound like good properties for a subwoofer enclosure. I did some quick calculations and with some element requiring very small enclosure (like P.audio TM-10 which would work well in a 15l reflex) and with a cube of inner size of 25x25x25cm and 5cm thick walls (overkill) you'd need around 60kg of polymer concrete which translates to around 2,7 liters of epoxy (rest is granite gravel/stones/sand). So finished subwoofer would weight like under 80kg. Doesn't sound too bad, light enough to be carried by two people. I'm pretty sure you could make it with way thinner walls, this was just a simple calculation.

Is there any reason why polymer concrete would not make a good enclosure? Would it be considerably better than MDF? Please enlighten me. It might be "overkill" but I sort of like these kinds of "because I can" projects

[DrDyna]

You might find this interesting:

DIY Granite Speakers with Seas G17REX/P and 27 TFFC Drivers

[Boden]

Look here: Luidsprekers - Terrazzo Art Fidelity - Outstanding in Sound and Design - TAF Oss. Has been succesfully been done for ages...

regards,

Eelco

[tb46]

Hi,

Polymer concrete has been used extensively in the machining world. Google: polymer concrete and epoxy granite.

Regards,