Optimal Audio Sub10 250 Watt Installation Subwoofer. 
 
Compact and powerful 10" installation subwoofer. 
Ideal partner to Cuboid 5 and Cuboid 6 speakers. 
 
DIMENSIONS:  (W) 470mm x (H) 297mm x (D) 353mm (W) 18.50” x (H) 11.7” x (D) 13.9”
WEIGHT:  12.9Kg (28.4lbs)
 
Optimal Audio are part of the Focusrite Group of companies which includes Martin Audio so you know you're getting a quality, great sounding product.