13 cm (5 inch) size woofer unit powered by a high-power amplifier (rated output: 50 W) -Volume controller, cross over frequency adjuster (60 Hz to 150 Hz) and phase changer for tuning according to your environment -Stand-by function to reduce unnecessary power consumption (ON/OFF) -Rigid and supple fiberglass diaphragm in the woofer unit -Sealed type speaker to reproduce music sources faithfully and to reduce incidental sound -Space-saving c . . .

Read More

13 cm (5 inch) size woofer unit powered by a high-power amplifier (rated output: 50 W)
-Volume controller, cross over frequency adjuster (60 Hz to 150 Hz) and phase changer for tuning according to your environment
-Stand-by function to reduce unnecessary power consumption (ON/OFF)
-Rigid and supple fiberglass diaphragm in the woofer unit
-Sealed type speaker to reproduce music sources faithfully and to reduce incidental sound
-Space-saving compact design

http://www.fostexinternational.com/docs/products/PM-SUBmini2.shtml#content-2-tab-tab

Read Less