Surround Loudspeakers for HKTS8, HKS 3 SPECIFICATIONS: General Recommended Power : 10  80 Watts Impedance : 8 Ohms nominal Sensitivity : 86dB @ 1 Watt/1 meter Frequency Response (6dB) : 110Hz  20kHz Tweeter : One 1/2" dome, video-shielded Midrange Driver : One 3" driver, video-shielded Unit Dimensions : Height : 6-9/16" (167mm) Width : 3-15/16" (100mm) Depth : 3-5/8" (92mm) Carton Dimensions : 6-1/8" x 11-5/16" x 10" (156mm x 287mm x 253mm)