The dash speaker holes on Blazers from 1992-2005 will take a 4" x 6" speaker if it is the right depth. Pioneer model TS-G4642R is 1 3/4" deep and fits properly, but is a bit expensive. Because the dash has a crossover installed (a crossover is used to filter out certain frequencies and in this case filters out low- and midrange frequencies), most people will simply want to use a tweeter in this location. Obtaining used tweeters at a junk yard or from eBay may be the best alternative if you have damaged speakers in this location. Any round speaker smaller than 4" that is no deeper than 1 3/4" should be possible to fit, but will probably require a mounting bracket of some kind for proper fit. Three inch round speakers can clearly be made to fit.
Also keep in mind that the ohm rating on the speaker needs to be close or the same. Most of the factory speaker systems were designed for 8-ohm channels and the front speakers in the doors were 4 ohm and the tweeters in the dash are 4 ohm to make a summed total of 8 ohms.
the speakers in the dash are 4x6s, the speakers in the doors are 6.75in. and the back speakers are 6x9's
6.5in
4x6 in the dash and 6x9 in the rear
The 1998 Chevrolet Blazer dashboard speakers measure four inches by three inches. There is a dashboard speaker on each side of the dashboard.
The 93 K1500 Blazer has 4 x 6 inch in the dash, and 4 x 10 inch in the rear.
i just recently put new door speakers in a 2000 Chevy blazer. They are 6 and 1/2 in all four doors.
5 1/4" I have the same year blazer and i just replaced all my speakers. At least it's 5 1/4" for the door speakers and i can't tell but there's places in the dash board for 4x6" speakers.
Dash = 4 in x 6 in Door = 6.5 in Rear = 6 in x 9 in
If its a 2 door the speakers are 6 X 9.
If you are talking about an S-10 pick up the dash speakers are going to be 4x6 and the doors will be 6.5". If it is a S-10 Blazer the same sizes apply for the dash and front doors and the back doors on a 4 door model will also be 6.5" while the back speakers on a 2 door model will be 6x9.
5 1/4 for the back doors and 6 1/2 for the front doors. I am not sure about the dash board speakers.
The speakers i put in the dash of my 98 were 3.5 inch speakers!