VOLFENHAG ZX-858R 4x10" 500w 2 Way Car Speakers [Electronics] 4 x 10 2 Way Coaxial Speaker 400W 1.5" polymide cone midrange, 1/2" neodymium tweeter 450 watts peak, Impedance: 4 Ohms freq response: 70 Hz - 20 Khz., Sensitivity: 90 dB @ 1W per 1M Butyl Rubber surrounds eliminates distortion and unwanted noises