The cutouts are for 6.75" speakers. I just installed 3-way Infinity Kappas in the front, and Kicker midbass in the rear. It sounds ok. The factory stuff is pretty hard to equal because everything is matched perfectly. If you like the factory sound, stay with the factory speakers.
I got four Pioneer 180watt 2way 6.5" at walmart for about $45 for two, $90 total and it sounds really nice. I then put two 12" dual subs in a box with a 460 watt amp from best buy for about $250 package deal. And it rocks!! Very happy. I then mounted the amp to the speaker box and got some six pin connectors plugs from work, you could probably get them at a hardware store or Ebay and made a plug so I can take the box out when I need the room.
97 ZJ Chop Top-Buggy 5.2L V8, 249 T-Case
5" Lift, JKS Front and Rear Adj. Trackbars, RE Twin Tube Shocks, RE T-Case Drop, Cut Fenders, Chop Top, Half Doors.
33"x13"x16" Super Swamper TSLs on Black Steelies
Custom Rack, 4 Roof Lights, Roof Back-up Lights
x3 mb quarts are hand made from germany, great sound if you want good crisp quality. i have those in the doors, and 2 12" rhinos in the back with a memphis 1000 watt digital amp. if you go with subs too put a high pass filter on the lines to the door speakers. keeps you from blowing them when you crank the bass.
If A is success in life, then A equals x plus y plus z. Work is x; y is play; and z is keeping your mouth shut. - Albert Einstein
No need to go overboard. 6 1/2 speakers fit in as replacements just fine. All you have to do is drill a couple of holes for the screws to fit in the sheet metal. Very easy. I replaced mine with some old 3-way speakers that I had lying around for years. They are just a Radio Shak brand speaker and they sound better then the stock ones did.
Oh, yeah, and you'll have to do something about the wiring. The stock speakers have a propritary plug on the end. I just cut mine off and crimped on some genaric female connectors that fit on "normal" speakers.
2000 Saab 9 3 Viggen - Daily Driver
2004 Honda Odyssey - Baby Hauler
1981 VW Scirocco - Featured in Jan 2001 Sport Compact Car Magazine
1997 Jeep Grand Cherokee Limited 5.2 - Mountain fun Vehicle
1996 Kawasaki 750ss - Lake fun
1996 Kawasaki 750xi - More lake fun
I've got 4 ohms in both of my 97 ZJ's and they work great with the infinity amp.
In one jeep(factory infinity gold) I've got a 4 ohm Sony 6.5" coaxial in the front door and it sounds really good and works great with the front dash tweeter. That's been in there for several years with no probs. If I'm not wrong the front dash tweeter is wired in parallel with the door 6.5. I've always wondered if the factory tweeter by itself is 2 ohm and the door is 2 ohm would that make it appear as a 1 ohm load to the infinity amp?.....maybe they're wired in series to appear as a 4 ohm load? Anyway I think you're fine to put a 4 ohm in the door.
You might also consider getting a 6.5" to 6.75" speaker adapter on ebay for about 10 bucks shipped. Depending on the speaker you get you may not have enough room at the edge of your new speaker to catch the door metal.
The other jeep was just upgraded the other day with an Alpine 9885 HU, polk 6.5's coaxials front, polk three-way 6x9's back(mounted in boxes that sit on top of a sealed sub box with two 12" Alpine Type E subs powered by an infinity reference amp)
The front/back speakers are powered by an Alpine f250 50w x 4 amp. I also replaced the factory dash mount tweeter with a component tweeter and crossover from a DUB 5.25 speaker kit but didn't use the 5.25 speaker. (I'm not sure what the ohm value was after that but seems to work perfect with the front 6.5's which are factory wired in parallel-I think?)
I had a $1,200 Alpine system back in 1980 and it's so sweet to be back with alpine!!! Music is so clear, separated and detailed yet it shakes your chest without hurting your ears. It amazes me that I can hold a conversation with a passenger even when it's cranked up!