plywood

I plan on building a 6.5 cu ft. slot port enclosure and I know its going to be heavy. so I'm tossing around the idea of using Plywood instead of MDF to save weight? I read somewhere that plywood is a bit lighter than MDF. Could somebody please advise me on the pros and cons of building in...

Just wondering if anyone has used 5/8 plywood then green glue and then a layer of 5/8 drywall. I was planning in doing this because it will give me options for mounting my projector later because with the use of hat track and isolation clips I will no longer be able to mount to the solid block...

1" 15 ply birch plywood for speaker box. Overkill or just right?

I have built speakers out of MDF before and used butt joints. If the edges are nice and straight the joints seem pretty air tight and strong (using just glue). Can/should I use simple butt joints with Birch plywood? I don't plan on using any fasteners. Another alternative I have is mitered...