Shawn,
Some thoughts about laminating two sheet of MDF together... I agree that plain old yellow wood glue is plenty strong. Make sure you spread the glue out in a thin layer on both sides of the wood surfaces. Even with a very thin layer of glue, the two pieces have a tendancy to move under...
Chris (or anyone in SoCal) If you want to get into the Adire 281's and don't want to build the cabinets, I'm selling my 281V's and 281S. Check out the Hardware FS section. Jim PS-I've also bulit an A/V1+ type speaker, the SPCA by Dennis Murphy. The 281's and the SPCA's are both good...