I'm considering building some Lab subs and have been trough the archives and using google extensively, but I still have some questions that need answer before I say go, so I hope you guys can help me:
1. On the Lab documentation page there are two available designs, Jeremy Bridge's for 18mm wood in metric, and Brian Fehrman's design for imperial measures. I've noticed some differences between the two designs, so I wonder if its two different designs, or reading error, or different versions? And if it's two different designs, witch one is "best"?
2. I've seen some fabrication photos, and for me it looks like people are only gluing the horns together. On my other DIY-subwoofers I've used glue and screws/nails in all my joints, but is this project designed to be glued only?
3. If I'm building 4 boxes, how do I stack them "correctly"? Standing side-by-side, 2x2 stack on their side bottom-to-bottom(all horn mouths in "center" of the stack), or 2x2 on side top-to-top? I know that it's no absolute truth on how to stack subwoofers because of the different locations and demands you meet on the road, but I believe that someone here has found a good working average solution.
4. If I were to build 8 and wanted to use them in a traditional LR-system with subs on each side, as you do commonly with ordinary front loaded subs, would the system work in the same way as an ordinary subwoofer system in terms of dispersion, power-alley etc.?
Edit:
Forgot a couple of questions
5. Is the common HPF and delay setting 35Hz and 10,5ms?
6. Can I build them in MDF or do I need to use Birch plywood or another "high grade" material?