R1700BTs Enjoy Detailed Sound and Relax Features: Bluetooth connection with Qualcomm aptX Subwoofer feature The front bass reflex port Wireless control for your convenience Specifications: Total power output R/L(high): 15W+15W R/L(mid-low): 18W+18W Driver unit Φ19mm tweeter unit + 4 inches mid-bass driver Signal-to-noise ratio ≥85dB(A) Input sensitivity LINE IN 1: 700±50mV LINE IN 2: 550±50mV Bluetooth: 400±50mV Frequency response 52Hz-20KHz Input LINE IN 1, LINE IN 2, Bluetooth