Pioneer TS-WX305T 30 cm Tube Type Subwoofer
"Dimensions (W x H x D): 341mm x 341mm x 669 mm
Double Stacked High Energy Magnets.
Cone Body with Blended Abaca Fiber for improved sound response.
IMPP Composite Seamless Cone.
High power and loud sound are achieved by incorporating a long voice coil and large magnetic circuit."