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

I once saw a demonstration about concrete boat hulls. At one point the speaker struck the side of the concrete hull (it was an unfinished boat out of the water) with a pipe or bar and it rang like a giant bell. We actually sailed a concrete hull sailboat. Beautiful boat.

To say one material is always superior to another and another material is always inferior is an over simplification of what's involved in the designing of any product. The implementation is just as important as the material used.

For example, some people here argue that aluminum is the best material to use for speaker enclosures. Which alloy are you referring to? 6061, 2024, 7075...? What cross section? What shape? Pick up a piece of 0.5" thick 7075 and strike it with a bar, it will ring big time. I'm not saying aluminum isn't good for use in speaker enclosures, it can be great if used properly. BTW, properly designed aluminum extrusions can be economical and practical for speaker enclosures if you sell enough product.

I tried concrete, and the sound was weighty and too hard. I wanted something more airy. So now trying styrofoam.

BAD idea it will sound like bricks  are you joking?

Ideas, ideas, ideas!  This leads me to think of horn speakers.  Have someone cup their hands around their mouth and talk to you - it doesn't sound ANYTHING like them talking to you without their hands cupped around their mouth!!!  WHY, WHY would you want that effect in your hi-end audio system???  TOTALLY UNNATURAL!!  Horns are fine if accuracy is not a requirement or you just want to fill an auditorium with sound - but, to me, NOT for music!  Another concept from the past that has fueled a company to be a "great seller" is Amar Bose and his direct-reflecting speaker concept.  When have you EVER been to a concert/music presentation where the performer(s) and their equipment were turned around to face the back of the stage, save for one or two pieces of equipment for direct play to the audience - NEVER!!!  We won't get into the ridiculous 901 speaker design here! the unconscienable joke that it was!  But yet Bose is a top-selling brand!      Sorry for the divergent rant - all this talk about speaker cabinets set me off!  and these are IMHO only!

Everybody is saying no good...but who here has heard them ?