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

You would think aluminium billets would ring like a bell but they are used often. Concrete is a too general term for a number of different mixes which obviously have different characteristics. Which would be best for speakers, I don't know. As previously stated concrete has been used in transmission line speakers. I still rate concrete as a great idea for speaker plinths and equipment stands, as for speakers I think it certainly would be worth investigating further