Sound quality in 128kbps vs 256kbps in car stereo?

I have a 16GB iPhone and my iTunes library is well over 30GB. I want to download all the music into my phone and the only way I can do that is by choosing to transfer the music as 128kbps (or 192). Will I hear a HUGE difference in sound (treble, bass, etc.) when I'm listening to my music in the car? My car has JBL Green Edge which is the upgraded stereo system for Toyota.

You most likely won't notice unless you are a true audiophile, However what I would do to be sure is use the higher data rate to ensure a better chance of clean sound without a loss. You could always try it one way today and change it tomorrow, then listen to the same songs and see if you notice a difference with your particular stereo.

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