MartinLogan Motion 8 Bookshelf Speaker Each Type: Bookshelf Speakers Driver Units: High Frequency Driver: 1 x 1.4 (2.6 x 3.6cm) Folded Motion Transducer with 5.25 x 1.75 (13.3 x 4.4cm) diaphragm. Mid/Low Frequency Drivers: Two 4 (10.2cm) paper cone. Power Rating: 90 watts Frequency Response: 70–25,000 Hz ± 3dB Nominal Impedance: 4 ohms. Compatible with 4, 6 or 8 ohm rated amplifiers Sensitivity: 89 dB/2.83 volts/meter Cabinet: Sealed |