why are old school amps worth so much?

I don't know, heavy MDF boxes are not light either. I would guess it does not need to be that thick, but there has to be a structure inside to hold it together. IIRC you cement the stuff together not sure how else you mount it. I looked at some sq ft tiles here that are similar, .5" thick, and not even that expensive though one would need larger pieces for most boxes. I use ply most of the time, lol, but if I had the right sub for a small box like 1cf, then I'd consider this.
 
old school amps are much better in built and sound than amps in those days.thats it.My phase 700b and luxman M02
 

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