How to measure the size of your car speakers 6x9 or other size?
Measure the speaker and calculate the size according to the effective vibration radius.According to the outside edge of the paper cone isn't pressed into the diameter of the fixed apron, the speaker caliber with inches.The average person uses the ruler is centimeter metric system more, measure the paper cone diameter after how many centimeters, divide by 2.54 (2.54 centimeters is equal to an inch), be inches.
The 4 inch speaker: screw hole diagonal distance is 11.5 cm, adjacent hole distance is 8 cm, speaker caliber is 10 cm;
The 5 inch speaker: screw hole diagonal distance is 13.5 cm, adjacent hole distance 9.5 cm, speaker caliber 13 cm;
The 6.5 inch speaker: screw hole diagonal distance is 15.5 cm, adjacent hole distance is 11 cm, speaker caliber 16.5 cm;
The 6x9 speaker is oval. The measuring method in the same way as the 6.5-inch speaker.