Edifier R2750DB Active 2.0 Speaker System with Sophisticated Sound in a Tri-amp Audio - Bluetooth Connection 6 1/2inch Bass Driver 136W RMS System 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