TR40C Specfications 2-way coaxial speakers Diameter : 10cm (4") Peak Power : 180W RMS Power : 45W Sensitivity : 90,5dB/2,83v/1m Impedance : 4Ω Response : 65Hz - 22000Hz Mounting Depth : 43,6mm Grilles included Features : Injected polypropylene cone with brushed electro-plated finish for a perfect design Laser cut logos for a perfect finish 13mm Mylar tweeter with phase lense for a perfect sound 25mm Aluminium voice coil for a higher power handling Rubber suspension for a perfect reliability Soft and highly musical sound quality