On sale passive subwoofer size 15 inch (380 mm) KICX in acoustic design model STC 380.
Nominal power – 350Ватт, maximum – 700Ватт with a load of 4 ohms. Frequency response – 22-2700Гц.
The size of The acoustic enclosure - 520х(350x200)х440мм (LxWxH).
The volume of box 52 litre net.

Details here.