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you need an adapter module from a company like Metra-online or PAC to adapt an aftermarket radio to the factory amplified speakers.
Otherwise you can't use your Sony properly without replacing all of the speakers in the car.

There is hope, though.

i am gona tell you right know to install that factory HU back on right know

van came with Infinity and the head unit is a Sony.

oh crap i take that back , for some STRANGE reason i assumed you had a NEW chrysler 300, that changes everything ,damn power 106 they keep talking about the new chrysler 300 like on every commercial(nice car hey?) forget the putting back the original hu(especially on a van)unless you drive like a new pacifica i completly take that back , oh well man you got to change the spekers and put in a amp to get a good sound there, you can do it 2 ways, get some real nice equiptment and get it all online and spend a normal amount of money(compared to suggested retail price at a local shop) or you spend a very little amount of money and get a decent sound sytem in there(less than all the entry level retail price products at a local shop) either ways you save man , as long as you buy online on the right places, so think about it if i were you id do it right and do it once, so pick and let me know :)

wow you are in quite the situation, i am gona tell you right know to install that factory HU back on right know, changing youre spekers and running them of the HU power will probably sound worse than using youre stock speakres and stock HU, adding an amp and not wanting to spend money on spekers or buying cheap speakers is also useless, also youre HU is not putting out 52 watts, its more like 19 watts, remember rms and peak are 2 difirent things, if i were you i would put that factory hu back until youre ready, and please post the model number of that sony HU, sony dosent make good products so dont even think about that, but let me see if you can atleast keep the HU in a future set up since its already bought.

What I have now is Chrysler Infinity 10 speaker system with the amps on the main speakers and satellites driven from those amps. One in each front door w/amps driving a 5x7 in the door and a 5.25 two way in the dash with separate feed for the two coils of the dash speaker. In the rear I have a 6x9 two way speakers with an amp in the side panels driving a 31/2 in the rear pillars.

This all sound quite good with the factory Infinity radio, not so good with my Sony head unit. As it sits right now I have very low volume and the speakers start clipping at about half volume.

The next thing that I tried was a “Scosche” 4 speaker level converter, needless to say it su*ks. Worse then before, sounds like an AM radio or a bad cassette.

So now I think that my only alternative is to change out all the speakers. I don’t want to spend too much but I am willing to “invest” in something decent. I really don’t want to set up amps now and just use my head unit’s internal amp. Then a subwoofer with its own amp as my head unit has a sub out.

I want to retain the factory locations and sizes for the speakers, as to keep the inside of my van looking clean and stock.

The head unit has an out put of 52 watts @ 4 ohms but also can run from 4 to 8 ohms. I have not found a decent crossover that would run in speaker level. So I am wondering if I can run two 8 ohm speakers in parallel. I do know ohms law and know the wattage will be cut in half. But how will it sound? Will it not have enough power to drive the speakers or is this ok.

On the speakers what are your favorites, I am leaning towards Infinity, JBL or Sony’s
Have JBL’s at home and there great, van came with Infinity and the head unit is a Sony.
So not sure what to go with? Let me know what you think .what sounds good for the cost?