New Fischer & Fischer Audio 670 Speakers : Made Out Of SLATE..

@serjio 

Have you heard them?

I have not heard them yet 

@rick2000 

Id be curious to hear them. Slate, like cast iron or granite, is an intriguing material for speakers because of its resonance control and rigidity.

My question was directed @serjio  who seems to think a speaker is a violin.

@perkri I watched a bunch of Real World Audio's videos on Youtube. He's obsessed with single driver speakers using active cabinets (voigt pipes, folded voigt pipes, transmission lines).

Paraphrasing:

Real World Audio actually uses the violin analogy to describe active cabinets. Violins are made of the lightest, most rigid wood because you want the cabinet to resonate to amplify the sound. Wood with a natural grain is preferred but plywood is acceptable and much cheaper. MDF is bad because it has no natural grain.  These cabinets are inherently harder to build because you have to fine tune the cabinet by slowly removing material and using bracing. 

Slate is an intriguing choice because it has laminar structure like wood but is rigid and hard like stone. So is the Fischer speaker using a dead cabinet (MDF/granite) or an active cabinet (wood)? 

The first time I decided to get my speakers off the thick carpet, I used Slate Slabs and the change was stunning