Anyone heard of this woofer, it's marketed as a car audio driver. A friend of mine went against my suggestion of using a Tempest and went for one of these Volfenhag 15 sub drivers (ZX4715DVX) and since I already told him I'd help with the construction I thought I'd run it by you guy's and see if some one could point me to a easy fast and dirty on-line calculator that can help me find the proper enclosure volume and alignment for this driver. It will be used primarily for HT on the LFE output with a PS Audio amp bridged to mono @ aprox 120 Watts. Here are the Parameters Re 3.2 per coil Fs 29 Hz QTS 67 QES 80 QMS 3.97 VAS 130.3 Liters (4.6 ft3) SD .0491M SPL 90dB 1W/1m Xmax 16mm I know this don't look good. Maybe some one could give me some idea, he already has some 24" Son-tube. Thanks for any help, my modeling program is not up and running and with all the OT lately I don't have time to do it the old fashion way.