Hi Gortnipper, I have just built another plinth for my 401 using birch ply which I was able to source as an offcut from a motorbody builder (trucks) It is the decking material they use on trailer units. I used an 18mm thickness (it also comes in 22mm) two layers epoxy glued together. Each sheet is 15 layer ply, it has a dark brown phenolc finish on each side, one smooth and one a fine grid pattern, which compliments the 401 very well.
The difference in sound quality over my previous plinth of 25mm MDF has made the effort very worthwhile.
The best part was the price of the ply, a dozen Tui.
Sweet! How good is that! Do you have a pic?
I built a plinth for my 401 out of a swamp Kauri slab, that is too resonant. It was about 55mm thick and showed the motor from the front, which was not great. I glued up three layers of 15mm marine brownwood ply to the bottom of that, rebated 25mm, which I spray enameled black. Much more mass to hopefully counter the resonance, but a side effect will be masking the motor from view. As soon as I recoup from minor surgery of this past Weds I will glue the sub-plinth on and slap the 401 back in. If you ever get up AKL way, drop me a line and I will spot you a cold one.
here is the before pic -
As far as the 301 goes, we are trying to do a group buy of some slate and water-jet time...
Alec/Folkis* - thanks for the J7 rec - I will check it out.
PS - sorry to the OP for my massive hijack of the thread.