Picked up a 2014 Willys Edition and love it. However the sound sucked so I went to see a friend who owns an audio store. I didn't want to break the bank, but wanted some much better sound.
They installed a small Focal Amp, FD2350 under the dash and replaced the rear speakers with Focal PS165v and tweeters which you can see in the photo. The difference is amazing! I'm beyond happy and may even replace the front speakers eventually.
There is lots if bass and no sub. No room taken up which I'm happy with because a two door has no room to waste!