Now that you have a roller, have you played with the audio much? Are you still satisfied with the C2's? How much power (RMS) are you running to them? Also, what exactly did you do to the front baffles? I also have the same baffles with the polk DB's but other than a small hole to run the wires thru, they are sealed.
I'm still very happy with the JL C2 speakers. On one of my test drives I streamed some music over bluetooth. For having no muffler, no windows, and big off road tires the music was still very audible at half volume. At full volume it over powered the engine and still wasn't distorted — I had to turn the music down since it was too loud for me even while chirping the tires at 35mph. I can tell that I'm going to be even happier once I get a muffler on and some windows. Ever since I've had the battery under the hood I've had tunes pumping in the garage. Their ability to separate vocals from instruments for heavy metal (I find this genre is the hardest test on speakers) even when I'm across the garage or under the Jeep is great and even better when seated in the Jeep. Walking across the garage to grab a tool become a trip to the dance floor (I'll even admit to busting a move
).
The first amp (KTA-30FW) puts out 75 watts RMS to the 4 speakers. And the second amp (KTA-30MW) puts out 300 watts RMS to the sub.
For the front baffles I cut a ~1/2" hole into the bottom/rear of each for drainage and airflow. Without I was finding that the speakers would pull a vacuum on the baffles and "top out" the output.
While the speakers are sounding more fluid as they've broken in, my original review for them still stands: they are slightly warm but I think still well matched for the available mounting locations in a Jeep. If I were to focus solely on sound and not worried about space or offroading my Jeep I'd look into alternative enclosures, moving the tweeters up, upgrading the speakers to the JL C5 line, and upgrading the subwoofer since the Kicker I have replicates tones into the mids like you'd except from a woofer and not clean enough as a sub. But that's not my priority for this build and would lead to compromises on my main goals. However I think that's beside the point, the big appeal to the 5.25" C2s is that you don't have to fiddle with them, baffles, pods, LP/HP filters, timing, fitting 6.5" into the cage pods, etc, they sound great out of the box and if you spend another 10 minutes setting up filters on the amp you can get even more out of them. The downside is that they are power hungry monsters that require a big relatively expensive amp to drive them.
All in all, I think it's a high quality upgrade that's easy to do and doesn't leave me wanting more.