Some where in the 7.1 receiver there is a menu for speaker setup. Set this for the number for speakers you have and how they are arranged around the room. My Denon even ask for the size of each speaker (large or small). and if you are using a sub woofer or not.
a 6.1 or 7.1 surround receiver would be required to amplify the sound for this number of speakers.
Try Crutchfield.com. They can match your car to the correct speakers, but I'm sure you can fit 6 x 9's in the back.
No, 6 does not go into 71.
LCM of 71 and 6 is 426.
6x8 , front and rear speakers. Can use 6x9's by removing the factory bezel.
71
6 x 11.83333 = 71
11.8333
Front speakers are 6"1/2 Rear speakers are 6"X9" Front speakers are 6"1/2 Rear speakers are 6"X9"
No. Not and maintain good balance and dynamic range.
The front speakers located in the front doors I believe are 6 inch speakers. The rear speakers are 6 inch X 9 inch speakers.
It has 6 speakers.