The Sonodyne IWO 811 SlimCore 2.5, an on-wall/in-wall speaker with a shallow profile designed to fit modern spaces, offers experience of clear, balanced sound and a rich design featuring a minimal profile. Controlled bass is provided by the twin 3 inch passive radiator driven woofers and the highs are crisp and detailed by the 1 inch dome tweeter. Its frequency response of 75Hz 20kHz, sensitivity of 83dB and an impedance of 8Ohms make it an excellent match with amplifiers rated at 60-100W. It has a 3.2kHz crossover making it a refined performer in a sleek satin black MDF case with convenient wall-mounting.