Concrete Audio N1 Loudspeakers : Cabinets Made Of Concrete...
Here’s some reviews
https://the-ear.net/review-hardware/concrete-audio-n1-floorstanding-loudspeaker/
https://www.concrete-audio.com/en/news-en/n1-review-audio-82018/
Wasn't this something similar to what kenjit wanted in a speaker?
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