Thanks for replies. I wana keep the tweeters, just need some added base. Most modern standard speakers in cars are fine for me, but these are substandard, there is literally no base at all in 2005 models. I'd like to replace the two larger speakers in front and back.
Head Unit, i dont want to mess around with getting a gap filler by replacing the standard head unit with my Sony. I used to have a GT Blackline with Bose sub and it had the same head unit, so assumed that was sufficient, just needed speakers?