Hi guys, I'm new to 5th Gen Rams and I'm hoping someone here will be able to help shed some light on what needs to be done to fix my problem. I'll start with my truck it's a 2021 Ram 1500 Rebel Crew Cab with the big screen equipped with the Harman Kardon system. As most guys here I've owned 4th gen Rams with the Alpine. Yes there is a huge difference in sound between the two. The Alpine is more of a heavy bass deep sound. You definitely feel it when you have the sound jacked up. The Harman Kardon is a complete different ball game. The sound is loud but it's for sure lacking bass compared to the Alpine stereo. If I did my research I would have found all this and most likely would've just stuck with the Alpine stereo. To me it sounds way better as a stock system. So now I'm stuck with this Ram for a bit, I'm looking to add another Sub Woofer under one of the back seats. My question is what would I need to complete this job myself? Do I need to purchase an amp to run the aftermarket Sub? Are there preamp subs where you just have to plug them in? I'm looking for a easy solution to add more base if it's possible. I've read a bit about some Rams having noise canceling modules that need to be bypassed. I'm not sure what Rams have them. Anyone who could shed some light, would be appreciated.