Actually man its more like even without doing anything your overall sound is vastly improved. your current unit is an outdated unit with a cheap Cr@ppy low quality 16 bit dac. Your sound quality is already really low resolution and uneven response from the start. With a new unit with a quality 24 bit dac, it'll be much better sound off the batt without any tuning. However with the EQ options, you'll be able to really fine tune the specific frequencies that may or may not still offend your ears. You also get the option of running active which ditches the sh*tty passive crossover and actually allow you to use proper crossover points and slopes that work with your vehicle acoustic to get a perfect blend between mid and tweet, the ability to adjust tweeter and mid gain level also helps with that as well. You also get the ability to time align the mid and tweeter individually and actually have a proper sound stage rather than a garbage blob of mess with components.
Give up CDs and this unit will utterly smash your current pioneer. It literally can go head to head to a certain extent with my 80 prs at only 80 dollars.
https://www.crutchfield.com/S-LKTwV4PN5lV/p_105KDX340B/JVC-KD-X340BTS.html