Description : Bass-reflex subwoofer enclosure, flared vent reducing air noise, built-in bi-amping: one 300W subwoofer amp and two 100W amps for kit amplification, using the 25 A1 subwoofer, numerous controls available. The ultimate solution combining flexibility and easy-install while offering 500W self-contained amplification capacity. Load :Vented Max. amplification :500W Max. power :300W subwoofer + 2x100W Nom. power: 150W subwoofer + 2x50W Frequency response (+/-3dB) :42Hz - 500Hz Subwoofer : 25cm (10") all weather woven glass fiber cone Magnet :145mm (5.7") Voice coil :50mm (2") Dimensions : 300x350x425mm (11.8"x13.8"x16.7") Controls :Phase, hi-pass crossover, lo-pass crossover, level, bass boost, external remote control.