Kenwood KFC-1665S + KFC-6965S 6.5" 300W 2-Way Plus (2) 6x9 400W 3-Way Car Speakers Kenwood 6.5" speakers provide max power of 300 with speaker and an RMS power of 30 with speaker Impedance: 4 ohms; sensitivity: 92 dB / W / M; frequency response: 35 Hz - 22k Hz Kenwood 6x9" speakers provide max power of 400w/ speaker and an RMS power of 45w/ speaker Impedance 4 ohms; sensitivity: 92 dB / w / m; frequency response: 30 Hz - 22k Hz 6.5" speakers have a cutout diameter of 4-7/8" and mounting depth of 1-11/16" and cutout diameter (6x9 inch speaker) : 6-1/16 , 8-3/4 inch and mounting depth: 3 inch