US source of Panzerholtz?

I used panzerholz B25 for my DIY TT plinth. Agreed, hard to work with, gummy (the glue) and hard (beech veneer). I did most of the cutting with a jig-saw (German blades) and file, and a diamond hole saw. Takes a good finish.

The thing is, it's acoustically dead, and it epoxies up very nicely, which is important for constrained layer damping. Which Delrin does not (epoxy nicely).

One of the very best go to materials, IMO. Worth the price? Depends on how you value your design time.

Agreed that constrained layer damping works by converting vibration to heat, but don’t agree that it is more effective when both layers are less stiff.

A counterexample to the ASC assertion is industry-leading Quietrock 545 acoustic drywall, with an embedded layer of sheet steel. Works very well in my listening room. This is consistent with my understanding, that what matters is speed of sound in the material. Adjacent materials should have very different sos. I have read that panzerholz sos and aluminum sos are similar (6000 m/s), but have not tested it, though I keep meaning to.

OH - now I think I see what ASC is talking about. Perhaps they are talking about vibration THROUGH the wall material, whereas what we are interested in is vibration ALONG the plinth material.

All the same, I wouldn’t want my walls flexing like a 10 cent woofer.

I just finished installing a Pz tonearm wand. Sounds better with every listening session!

A Pz tonearm wand sounds even better on my own LT design. Pz is my reference material, but experiments with some truly weird (and weird looking!) composites are very hopeful.