2-way floorstanding speaker wall-mounted installation possible by bass reflex in the base 1 x 130 mm bass driver 55x80mm AMT tweeter 87 dB efficiency 25 - 100Watt recommended amplifier power 4 ohms impedance Enclosure Type Bass reflex Transducer Complement 2-way Bass Driver 5"(130mm) black woven Kevlar cone Midrange Driver - Treble Driver 30*60mm AMT AV Shield No Sensitivity (2.83V @ 1M) 87dB Recommended Amplifier Power 25-100W Peak SPL 104dB Nominal Impedance 8 Compatible Minimum Impedance 3.5 Frequency Response (+/-3dB) 64Hz ~ 22kHz Bass Extension (-6dB) 55Hz Crossover Frequency 2.9kHz Dimensions (HxWxD) 335 x 210 x (285+10)mm Net Weight 7.8kg/pcs