R1580MB Active 2.0 Speaker System for Events and Small Venues Dual microphone inputs for use as public address system Class D amplifier with 4inch bass drivers and 13mm silk dome tweeters 100% MDF wooden enclosure to minimise acoustic resonance POWER OUTPUT:R/L: 21W + 21W RMS NOISE LEVEL:25dB(A) MICROPHONE DYNAMIC RANGE:-50~30dBV INPUT SENSITIVITY:PC:700±50mV AUX:550±50mV Bluetooth:550±50mFFS; FREQUENCY RESPONSE:55Hz-20KHz; MIDRANGE & BASS UNIT:4' (116мм); TREBLE UNIT:1⁄2 inch (13mm) INPUT TYPE:1/4', AUX, RCA, Bluetooth v4.0(A2DP и AVRCP протокол);