Subwofer Yamaha 45Watts 50HzSW-P440 • Type ............. Advanced Yamaha Active Servo Technology I... 16 cm (6-1/2”) cone woofer Magnetically shielded type • Amplifier Output ........ 50 W/5 Ω • Dynamic Power ........ 100 W/5 Ω • Input Impedance...................................12 KΩ • Frequency Response..30 Hz to 180 Hz