from the Musician's Friend site (specifications): Frequency Range, 1 meter on-axis, swept-sine in 1?2 Space environment: 51 Hz to 20 kHz Frequency Response, 1 meter on-axis, swept-sine in anechoic environment: 57 Hz to 20 kHz (3 dB) Usable Low Frequency limit (-10 dB point anechoic): 51 Hz Nominal sensitivity (1W @1M, swept sine input in anechoic environment): 97 dB (average) Maximum Sound Pressure Level (1 meter): 127 dB SPL peak with music Radiation Angle measured at -6 dB point of polar response: Nominal: 100 degrees horizontal X 50 degrees vertical (Axis of the vertical main polar lobe is angled down 10 degrees, resulting in the angular pattern with respect to straight ahead being +15, -35 degrees) Transducer Complement: Heavy-duty 15 woofer with 2-3/8 voice coil & 50 oz. magnet, RXTM 14 1.4 titanium diaphragm dynamic compression driver Box Tuning Frequency: 57 Hz Electroacoustic crossover frequency: 2,800 Hz Crossover type: Internal Electronic two-way crossover with driver EQ, level matching, bass boost and subsonic filtering. Crossover Slopes: 24 dB/octave (4th order) low pass, 24dB/octave (fourth order) high pass, both with staggered poles and driver EQ.