Best way to upgrade on sound system on 19 JL?

[MelosJeep]

I am a brand new jeep owner, and I seem to have the same problem most people have with the sound quality, it is not the greatest. Is there a link to the most convenient set up? What should I buy? Would replacing all 4 speakers make a difference without adding in an amp/sub?

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[Jebiruph]

I replaced the 3.5" with Infinity 3022cfx, discussed in this thread. https://www.jlwranglerforums.com/forum/threads/jeep-wrangler-jl-stock-sound-system.4009/