Originally Posted by steve718
is it ok to go from 2 ohm to 4 ohm?
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!