I have my big system pulled out of the Jeep pending the next setup... have this little guy in a small vented enclosure and it sounds GREAT. Bridged on the rear channels of a 100.4 for power.
I am really very pleased with it... I am happy with the output of just this one driver on more SQ oriented music. Honestly, I'd be pretty happy even on heavy material with a pair most of the time... VERY happy with it considering the power applied / enclosure size / cost.
Measured D4 specs finally. I manipulated the winding width a little so the D4 actually ended up with slightly higher motor force than the D2 -- good stuff //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif