I have seen several people on here recommend poly-fil. You could go to crutchfield.com and order baffles. They're very inexpensive. You just need to know your speaker size. I just got mine,, but haven't installed them yet.
It's my daily driver, if it breaks I'm screwed.
I've had great experiences with Rockford fosgate in friends vehicles. Kenwood is good quality. I have MTX they work well. Kicker makes loud noise but they are expensive. If price is a non factor JL audio can't be beat.
I just finished a sound upgrade in my 2000 TJ. Put in a new Alpine CDE-122 head unit, Polk Audio 4x6's in the dash and Polk Audio 6-1/2's in the soundbar! Much better than the stock speakers and the crappy Sony Xplod that the PO put in there...
If you have the Infinity speakers, then polyfill makes a bit of difference. I did the front pods, rear pods, and the center console sub, sounds better, but the Infinity's still are a high pitched speaker for my tastes. I packed it in fairly lightly, as tightly took away the mid-range, and made the sub too 'boomy'.
fuel in my veins, mountains on the brain......
06 Unlimited - 2.5 ish lift, 31" KM2, working on it.
BUFFALO NY JEEPERS
I've got 6.5" Kicker KS series speakers in the sound bar, 5 1/4's in the dash. I also had the tinny sound so I stuffed the sound bar with what I had on hand, rags. Not the best I know but the sound is so much better now, it will rattle the tub pretty good for a system without a sub. I also had to silicone the lamp lens to stop it from "buzzing", which was driving me nuts.
i just put in 4 - 5.25 Polk audios with a Alpine CDE-121 (i think) it was the $100 alpine unit. Best Buy had the Polk's on sale for $65 a pair. and 20 bucks for the 4x6 to 5.25 bracket. This sounds awesome! I also added a Kicker 10inch bass station, and I only have the gain set at 4.
I started with the Pioneer 5.25's and returned them for the Polk's much better sound and only 20 bucks more per pair.
1998 TJ-4L-5sp, 3inch Black Diamond W/ 33's GY Duratrac on MT Classic III's., Warn 8K# Winch.