It depends. In my 1994 Eclipse GS there were 3.5" speakers in the dash, 6.5" speakers in the doors and 6X9" speakers in the back. I think some have 6.5" in the back and some do not have the 3.5" in the dash. Best to have someone who knows what they are doing take a look at it. Some people put tweeters where the 3.5" are others just unhook the dash speakers and replace the door speakers with high quality 6.5"
Good Luck.
The correct size for the front speakers on a 1994 Apsire is 5 1/4" speakers.
Go to Crutchfield.com and they will have all of the sizes of your factory size speakers for your car.
cruthfield.com has all speakers stock speakers sizes for all cars -
The speakers in the doors of a 1994 Nissan Pathfinder are 5x7 inches. The rear pillar speakers are 6.5 inches.
The 1993 Mitsubishi eclipse dashboard speakers measure 3.5 inches in diameter. The front door speakers measure 5.5 inches in diameter. The rear speakers measure 7.5 inches in diameter.
It has 4x6" speakers.
6.75
you can find this information from crutchfield.com. go to their web site and put in the information for your vehicle and it will tell you what size speakers are in the different locations
they are 4x6 rear speakers are 6x9
4"
6 inchs
Which ones?