Edifier R2750DB Active 2.0 Speaker System with Sophisticated Sound in a Tri-amp Audio - Bluetooth Connection 1/2inch Bass Driver 136W RMS System BLACK Dual digital and analogue connections Crossover eliminates unnecessary sound Bluetooth 4.0 for wider reception These speakers pack a 136-watt punch.Almost any device is compatible with Edifier’s R2730DB. It gives you the option to control your music from the wireless remote or the side panel. TOTAL POWER OUTPUT: RMS 14Wx2 (treble) + 14Wx2 (mid-range) + 40Wx2(bass) (DRC ON) THD + N: 10% SNR: ≥85 dBA FREQUENCY RESPONSE: 45Hz-20KHz(@+/-6db) INPUT SENSITIVITY: Line in 1: 700 mV ± 50 mVLine in 2: 500 mV ± 50 mV OPT/COX: 350mFFs ± 50mFFs BASS UNIT:6½ inch (178mm) MID-RANGE UNIT: 4 inch (116mm) TREBLE UNIT Φ19 mm silk dome tweeter