Spend some time on tacotunes.com. Very informative. I recently upgraded my 19’ stereo non JBL, that being said there are separates for the front by Infinity (kappa line), JL audio that are 2 ohm. The biggest issue I see with that is that the factory wiring for the front separates. In a non jbl the drivers and tweeters are not run through a crossover network, the tweeters have a crossover built into the connection terminals. I would imagine this is the same for JBL and non JBL as it’s the factory harness. Anyways, I ditched all factory wiring and went with a separate amp. As mentioned earlier, go to taco tunes they have the parts and help videos to get you going.