JBL Power P-552 Car Tweeter

Pros: Highs and lows just like you would expect from JBL.
Cons: No matter what 5.5" you buy you are still going to need a subwoofer.

I recently bought a pair of JBL P652 and a pair of P552 to replace the factory speakers on my mid sized sedan. Before that I had also replaced the 2DIN factory CD/cassette player and put in instead a BLAUPUNKT Orlando stereo CD player and a BLAUPUNKT IDCA09 in-dash CD changer. The sound difference after changing the speakers was simply amazing. The high and low frequency response is great and you can really crank them up without the sound distorting. I highly recommend these speakers.