STUDIO 665C Dual 5.25", 2-way Compression Driver Center Loudspeaker, Quad 5.25" (133mm) PolyPlas Low-Frequency Woofer, High Definition Imaging (HDI) Waveguide with 1” (25mm) High Frequency Compression Driver, Recommended Amplifier Power: Max 200W, Frequency Response: 58 Hz - 40 kHz, Sensitivity: 90 dB, Nominal Impedance: 6 Ohms, Enclosure Type: Bass-Reflex via Rear-Firing Tuned Port, Dimensions (W x D x H): 760 x 230 x 190 mm, Weight: 16.12 kg