Yamaha KS-SW100, Subwoofer, Dynamic output power 100 Watt, Special EQ settings for this are available in the Yamaha PSR-A300 / S970 / S770 / S670 / PSR-SX600 / PSR-SX700 / PSR-SX900, Output power: 50 W (100 Hz, 5 Ohm, 10% THD), Frequency range: 28 - 200 Hz, With 20 cm bass driver cone, Magnetically shielded, Dynamic output power: 100 W, Advanced YST, Twisted flare port, Dimensions (W x H x D): 291 x 292 x 341 mm, Weight: 8.5 kg