POWER OUTPUT： L/R (treble): 12W+12W RMS L/R (mid-range and bass): 50W + 50W RMS SIGNAL TO NOISE RATIO： ≥94dB(A) NOISE LEVEL： ≤25dB(A) INPUT SENSITIVITY：Balanced input: 700±50mV Auxiliary input: 600±50mV Bluetooth input: 350±50mFFs Optical input: 350±50mFFs Coaxial input: 350±50 mFFs FREQUENCY RESPONSE：48Hz~20KHz TWEETER UNIT：Planar diaphragm tweeters MID-RANGE & BASS DRIVER：5.5 inch (148mm) DIMENSIONS：505(L)Å~350(W)Å~412(H) mmhttp://www.edifier.com/int/en/speakers/s2000pro