Re: What is the best cheap wood to use for a speaker cab
I got a sheet of of 3/4" 13 ply oak at Home Depot. It was at the bottom of the rack of their Birch plywood, which was sold out. It was dinged up on the edges and had some gouges and was probably there for years because the Oak ply I see there recently is either 7 or 9 ply. It cost me under $15 for the full sheet, they took 70% off. I used it to build a new baffle for a 4X12. I had to cut around some beat up edges but the section I used was void free where all cuts were made, including the speaker cut outs. That isn't typical because the Home Depot stuff is imported (China) and mostly crap. Online they show some domestic ply in stock at my local stores, including Birch, but they never actually stock it. What I'm getting at is that if you want cheap, you are going to be taking a chance. Personally, of the imported ply that Home Depot (or Lowes) has, I have done some back panels with Sande Ply but the stuff get's terrible reviews. I got a sheet that was almost void free and was decent plywood for "cheap" stuff but I think I got lucky based on the reviews. Don't use any of the Home Depot imported stuff if you don't plan on covering it. The veneer is very thin and tends to splinter when cut. I saw sheets of primed 13 ply at Lowes that looked ok on the edges but I think it was just primed Sande ply.
I used to build smaller speaker boxes (home audio) and subwoofer boxes (mdf with ply baffles) from 9 ply Baltic birch I got from a small, local mom and pop. This was years ago and the wood was $35, or thereabouts, for a full sheet. It was good, domestic birch, absolutely void free. Great wood despite not being 13 ply. But those days are over. That kind of money gets you crappy wood now. That, or you need to get real lucky to get a decent sheet. As I mentioned, I think I got lucky with the two sheets that I most recently bought. As someone mentioned, you will pay more, after tolex and grill cloth, etc. to build a 4x12 out of a quality ply (or maybe even crappy ply) than you can buy a good, used one made from good wood. Personally, I understand you wanting to do it yourself. But, you may want to consider paying more up front for a domestic ply. The cabinet that I replaced the baffle on was a yard sale MDF cab. I replaced the baffle and built a couple of back panels (closed and semi-open). It actually sounds fantastic but my point is that I wasn't going to spend a lot of money for good ply for this cabinet. If I were set on building one from scratch, I would suck up the cost and buy domestic birch ply that I knew was going to be void free.
For the record, I'm no carpenter or craftsmen. But, I can build a decent box. Or, at least I could before I screwed up my neck and then got old and achy.