Marine Ceiling Speaker Model No:JYD4028 / JYD5028 / JYD6528 / JYD8028 4" / 5.25" / 6.5" / 8" 2-Way Ceiling Speaker System Direct able 3/4 Titanium Dome Tweeter Power:70 / 80/ 120 / 180 Watts Max 8 / 8/ 10 / 20 Oz Magnet Frequency Response:90-20 KHZ / 80-20 KHZ / 60-20 KHZ / 40-20 KHZ Nominal Impedance:4-8ohms Sensitivity:88dB / 88dB / 89dB / 89dB Dimensions(mm):D171,d137,H69,h62 / D202,d164,H78,h68 / D229,d193,H80,h74 / D272,d236,H93,h80