Os dejo el link del modelo de sub .
http://usa.yamaha.com/en/products/audio-visual/speaker-systems/subwoofers/yst-sw90_black__u/?mode=model
Y las especificaciones por si no os apetece verlo ...
Driver 8-inch Spruce Cone
Amplifier Built-in 100 Watt Yamaha Advanced Active Servo Technology
Frequency Range 23 to 170 Hz
High-Cut Filter Continuously Variable from 40 to 140 Hz
Dimensions Width = 9-1/4 in., Height = 19-1/4 in., Depth = 16-1/4 in.
Weight 31 lbs.
Muchas gracias anticipadas y un saludo !!!!!