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The main purpose of a woodied t50rp, or Thunderpants, is to eliminate cup vibrations that are prevalent in plastic cupped phones. Hardwood is used in preference over soft for the same reason. Layering is a great idea, especially if you don't have access to a lathe. Mixing materials, as in "constrained layer damping", is commonly used for replinthing vintage turntables. Imo this may be worth pursuing for headphones. Materials used are mdf and baltic ply.
For turntables this is used because external vibrations from bass, footsteps, etc. can feedback into the stylus and add to noise. Constrained layer makes a lot of sense there.
I'd argue it makes a lot less sense for headphones. Of course, if someone with a lot of time wants to make layered and hardwood and compare, that'd be cool, but modulo someone having that much time on their hands, i don't think the physics of the setup would warrant it. The harder and denser the wood should yield best workability and audio, IMHO.
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