Yamaha MS45DR Electronic Drum Monitor System; Electronic Drum Monitor System; 2.1-channel monitor system: 2x 20-watt satellite speakers and 1x 20-watt subwoofer; suitable for racks with 1.5" tube diameter; frequency response: 40 Hz – 20 kHz; Dimensions (W x D x H): satellite speakers 110 x 138 x 183 mm, subwoofer 221 x 343 x 351 mm; weight: satellite speakers 1.0 kg, subwoofer 6.5 kg; incl. 2x rack clamps and installation cable