Need advice to get best sound with what I got.
 

Ok. I will try and explain everything without getting to wordy. LOL. First I have a 90 Volvo 240 its slick. Now for the question. Here is my equipment. Alpine UTE-52BT Head Unit with Alpine KTP-445A amp 4 channel 45w. RMS. My front 2 speakers are Kicker DSC65 are mounted in front upper doors. In the rear doors towards the bottom; I have 2/ 3.5 pioneer speakers dont know much about them. This is installed and have checked connections etc. all looks good and all were soldered. The system doesnt sound good at all. Have adjust head unit with no luck. I want to improve the sound quality the best I can and keep most of the equipment and possibly add. I do have a pair of Sony XS-R6945 6x9 speakers I can install in rear dash. I can probably afford to spend a couple of hundred bucks. Im not after alot of bass. I listen to 80's rock and some beethoven everynow and then. I dont blast my music but like decent volume. Thanks in advance for any help. I have been in couple of stereo shop only to find they want me to start over. The equipment is pretty new. Thanks in advance.

here what I have planned
 

I bought an amp to run the 6x9's. Should be big enough to drive them w.o. harming them. Im going to put bass blockers on the 6.5 and 4 inch speakers. Later on Im going to purchase a sub with an amp for the low bass frequency. Know my question was kinda broad. Anyway did recieve a private message and want to say thanks.