Infinity speakers are bad. They sound great until you put power into them. Then, they blow. I blew two sets, 4x6 and 5.25 speakers. Infinity speakers are only good without an external amp. The same is true with Kicker speakers. In your current dilemma, I suggest you try turning the grill counter clockwise. If it moves, then you have unlocked it. Then you can easily pry out the grill with a screwdriver between the grill and the plastic ring. Normally, the plastic ring is screwed to the speaker and the grill sits on top, either with turnable latches or bendable latches. This keeps the grill from falling out with street bumps.
If you want a great 4 speaker surround system, do not put 6.5" speakers in the soundbar. Bigger is not always better. The best 4 speaker setup will have the same speakers all around. Upgrade your front speakers to 5.25, and use the same 5.25 in the sound bar. Use polyfill behind the front 5.25 speakers to remove sound loss behind the front speakers. This will allow you to increase the front speaker sound and balance the sound with the rear speakers, giving you perfect 4 speaker surround sound at zero fade. Then, make sure that you have properly set your speaker polarities. Good luck.
My system: 4-CDT 150 watt RMS 5.25 speakers, with a 1500 watt Alpine PDX-v9. I have two 10" subwoofers in a MTX speaker box in the rear. At 50% sound, you can hear my system from 200 feet away. I have a Boss 10" touch screen, boss be10acp, single din, removeable screen, with wireless Android Auto. Everything is tuned. My Alpine PDX-v9, is mounted under my dash with a special TJ mount. It never heats up. I have never blown a speaker. And, there is no system that can compete. I am not bragging. I am just telling you that great sound is possible in our TJ. I added a $100 clarion eqs755 car 7-band graphic equalizer into the extra 1/2 din space to further tweak my sound to absolute perfection.
