Oz is certainly a plywood wasteland. Here more like $40-50 for the MDF, $80-90 for the plywood (a step up from BB), and given that you end up needing something ike 2x the material if you use MDF< the price difference falls the other way.
dave
Sure that's true, but I can still use lesser ply braced well and it performs the same, it's just mdf is easier to finish a lot of the time.
As I have $6k in driver cost alone for an upcoming build of a not particularly large speaker (for me anyway) then the BB isn't a huge addition, I just don't see any particular performance advantage to using it.
Here's a few pics, the round shiny things are 4.5KG lumps of cast iron bolted to the driver magnet.
Attachments
The table top and the floor can be recruited as part of an open-baffle hidden under the table. Pay no attention to those simplified models for OB performance - works much better than that in real-world rooms, esp with some digital processing.
B.
B.