SSL LS40 LS 250-watt 2 way auto 4" Coaxial Speaker (Discontinued by Manufacturer) Poly-coated paper cone Santoprene surround High temperature aluminum voice coil Mylar dome tweeter Peak power handling: 250WMagnet structure: 25 Oz. Efficiency: 90dB (1 Watt/1 Meter) Impedance : 4 ohm Frequency Response: 85Hz-20kHzMounting Depth: 1-7/8" Poly-coated paper cone Santoprene surround High temperature aluminum voice coil Mylar dome tweeter Frequency response: 85Hz-20kHz