Need advice for car project
I recently bought a 2012 Scion xB with the entry grade Pioneer HU. I've Dynamatted the four doors and the rear hatch and replaced the stock speakers with Polk db 651's in four spots. I also kept the stock tweeter in the door. I think it sounds terrible! Music is chesty with nearly no mid range at all and the highs get very shrill and piercing no matter the volume. Right now the Polks with the stock HU are not going to cut it for me. My budget for speakers, amp, HU and wires is about 3K.
I am a newb when it comes to car audio and have a few questions:
Would a good amp bring these speaks to life or does one have to replace the HU at the same time to extract the most out of the speaks? I only have experience with home audio.
Should I consider upgrading the speakers to the mm line? I listen to jazz and classic rock but am not interested in megasubs for the bottom, although I would entertain a sub at sometime in the future.
I'd like some input on possible choices and recommendations on how to proceed next. Thanks,