Thats real Baltic Birch ply 13 ply and it comes in 5'x 5' sheets and its really high quality and thats a dirt cheap price, usually around 60-70 bucks a piece for the highest grade (comes in 5 grades) nice stuff for sure.I have worked in carpentry and construction my whole life. I have used a lot of different plywood over the years and baltic is the best if your building fine furniture or nice speakers for in your home but differences are mostly for end finishing - like you want it stained it has less flaws. IMHO way overkill, I mean we are building speaker boxs and 90% are covered in carpet so It really dont matter. The 11 ply at home depot is fine and you will not know any difference period In fact I used HD pure bond and found it to be really totally free from any voids and cut nice and smooth and also used there triple sanded pine and it gets my vote, very good quality and 35 bucks a sheet and it will finish well too. Its in 4x8 sheets too 5' sheets to small for anything I have built. Also just for fun, OSB Oriented Strand Board is stronger than all of them. So if your excuse to spend more is for strength its not lol but osb ***** to cut and work with and its primarily made for roofing where its used in whole sheets pretty much but is really cheap 20-25 bucks a sheet. I was really wanting to see how FURGYS wall would have worked out but he tore it and three or four more down before testing so we will never know. I would like to play around with it and see how it does ? I am sure others have used it before
