Early last year, one of the first things I did after buying my Jeep, was to replace the blown stock front speakers with some pods and 5 1/4" Kickers. The sound bar already had some version of Kickers and the radio was aftermarket. I remember being underwhelmed with the fix. But it was better than it was. With all the other things that were wrong with this vehicle, any other mods/fixes would have to wait until the "done" list was longer than the "need" list.
The other day, I decided it was time to look into making it better. I isolated each speaker and took mental notes. Fairly new fronts sounded horrible and the as-bought rears sounded pretty decent. Didn't want to jump the gun until I knew it was radio or speaker issues. This morning, I moved the LH rear to the front. Just unplugged them both and plugged the rear into the front connector. Sounded good! Decided to grab some new speakers, but fell into the "upgrade" trap of trying to decide if I should just buy new fronts, or move the apparently decent rears to the front and buy some 6.5" for the rear. Decided to go with same size for ease of getting it all done quickly. Local, Bestbuy had them for 4 dollars cheaper than Crutchfield, so ran up and grabbed the part number that was in my head. Got out to the Jeep and found I'd ended up buying the 6.5" instead of the 5.25. Ungh. Oh well, going to run with it.
Put the old rear speakers in the front pods and mounted them up front while still in the parking lot. Plugged in the new larger rears and let them hang while I ran through the audio checks. Hmmm. The former rears in the front pods weren't sounding like I thought they would. The hanging rears weren't sounding like I thought they would. Unplugged the rears and drove it home.
Got home and mounted the 6.5" Kickers in the sound bar. Sounded a little different than the 5.25 that was in there. The rears mounted in the front pods almost sounded blown, kind of like how the other fronts were sounding. Wondered if it was something to do with the pods. If I pulled the speaker out of the pod it almost sounded better, clearer with more bass. As soon as I drop it back in the pod, it didn't sound so hot. I remember Zorba or someone mentioning drilling a hole in the pods and sound bar, just like the old custom subwoofer boxes of old. Drilled a 1" hole in the back of each pod, removed the polyfill and it sounded better. You could feel the air moving with the speaker mounted. Got the pods mounted and the grills on the sound bar.
The system had been sounding like an old handheld transistor radio from the late 70's or early 80's. And now it sounded like a boombox from the late 80's. Not horrible, but not the most awesome thing you've evern heard. I may look into putting a vent in the sound bar too. But for now, I'll live with the modest improvement.