Type: On-Wall/In-Wall 3.7" Shallow Profile Speaker, Design: 2-1/2 way, Driver Size : HF 1" dome tweeter, LF 2 x 3" woofer 2 x 3" high- compliance passive radiators, Amplifier Power: 60 - 100 watt, Nominal Impedance: 8Ω, Sensitivity : 83dB, Frequency Response : 75Hz-20kHz, Dimensions (WxHxD):220mm x 500mm x 93mm, Mounting Options: Key-hole bracket fitted, Accessories:IWO WB 63 (In wall bracket) sold separately.Weight:5kg