I have used MDF for every one of my builds.......about a Dozen pairs now. I honestly can't imagine how much more difficult it would have been using multi-ply. Perhaps the crappy void type ply outnumbers the void-free by ten to one...
Just finding the void-free doesn't seem worth the effort.the "sonic signature" of ply is "superior"...blah, blah, blah. Neither am I going to pay five times as much.
Now, this "trans-ply" CNC route has enormous potential but really works right with MDF for its consistency. With one inch MDF small FR drivers keep the layer count within reason. It is the FR crowd that needs "help" with the lower extension, hence the back-loaded horns, et.al.
With the CNC route with MDF for "full-size" drivers opens up all sorts of possibilities........can you imagine building a back-loaded horn for a 15" driver?
The precision of such a horn is so very near to "perfection"...none of this trying to align separate boards....a nightmare scenario.
Now, Build your perfectly aligned back-horn with the 15" driver, cut out a series of lightening "holes", artful ellipses of course, have an access hole for each cavity & use sand to "stabilize" the structure..........the possibilities are endless.
_________________________________________________Rick.......
