I've just bought a pair of these drivers (dual 4 ohm) from a forum member for my very first (semi) DIY sub effort, and I'd be very grateful for some feedback about my plans. I already have a Behringer NX6000D that I'll be using to power and EQ them. I plan to get a pair of sealed boxes made up in 25mm MDF and have 2 options - either a 75L or 100L box. I've modeled both in WinISD and have attached some graphs... from what I can see the bigger box will hit max cone excursion with only 425W at 5Hz and the 75L will take 600W. At 10Hz it's 600W and 750W respectively. Not sure I can see any major differences otherwise. I've attached the WinISD file for the driver in case anyone would like to have a go themselves, but is there going to be any real advantage in building the larger box? Given that I'll have more than enough power on tap, would it be possible to implement a Linkwitz Transform using the Behringer to give more output at the lower end? What are the pros and cons of this?