I have seen several posts by ThomasW about this driver and noticed some of the IB folks using it now. Since it goes for around $140 or so, it looks like an awesome deal. Quiestion is: Besides IB usage, has anyone else used it in a standard vented application? Quick Specs for anyone wanting to model it: PL15D4 (Dual 4 ohm VCs) FS 23 QTS .41 QMS 6.45 QES .44 VAS 2.8 cu ft XMax .79inch (20mm, right?) RE 6.7 PE 2000 LE92 PL15D2 (Dual 2 ohm VCs) FS 24 QTS .38 QMS .44 QES .41 VAS 3.02 cu ft XMax .79 RE 3.8 PE 2000 LE 92 I would probably be more inclined to use the PL15D2, that way I can wire the voice coils in series for 4 ohm load for something like a plate amp. Any thoughts on suitable enclosure volumes? I was thinking, 3 cu ft tuned to 18 hz. I modeled it in WinISD and it looked fairly good. Also, opinions on suitable power for this driver in a vented enclosure? I was thinking something along the lines of the Rhymik Audio 350 plate amp. Perhaps more would be needed to really make this driver sing?