The JBL speakers are more complicated, especially the front door. Over in the JBL thread, SOCAL250 upgraded theirs
JBL Stereo
There is a lot more bass potential with the JBL system than I'm getting in normal use. I found the LC JBL system's lower end bass response disappointing; there were some notes my old Grand Cherokee's 10 speaker Alpine system hit with authority that are largely absent in my LC. Thinking...www.landcruiserforum.com
You will need to get component speakers for the door that have a crossover and tweeter like the infinity primus 693c in that thread, or you could step up to the infinity kappa line
I dont think the component infinity refence REF697CF would work since it has a 2 way cross over that looks too large to fit into the A pillar, and I would not use a full range 6x9 in the door for the JBL replacement like i did with RE697F b/c it seems like the full range signal is sent to the door, so you need to make sure you dont end up doubling the tweeters
What do you think about these speakers for front door replacements for a LC FE JBl premium system.