i dont think so, the old owner never said but it looks like the speakers have a chrome tip on them, ill take them out one day when its not raining

 

If they're not stock what type of speaker are they? Figure that out when you take them out and post it.
My guess is they're cheap after market speakers if they're not stock, in which case it would be the speakers, but also your deck since the deck isn't that great quality to begin with.
If you're looking for great sound and really loud you'd want to invest in a half decent deck, some decent speakers and maybe even an amp for the back ones.

 

cool thankyou

 

found out what kind of speakers they are. The are kickers, and there held in loosely by wood screws lol.

 

Those are drywall screws actually
And I bet they sound wonderful...lol

 

is it the speakers of the radio, cause i want it to sound better

 

It's a combination of the both. You need good quality speakers, but also a good quality deck to send the quality sound to the speakers. I'm not an expert on brand quality, but I think kickers are bottom of the line cheap *** speakers, and I'm not a fan of sony xplod (just from experience).
If you want really good sound that you're going to crank a lot, you will want to look at a 100% new system. Go with a good quality deck, and good speakers. You'll want a good set to 6x9's for the back. If you want that extra power and quality get an amp put in for those 6x9's. This will give you a little bit of extra bass if you're into gangsta stuff (lol).
Bottom line is, you need good quality (which usually means $$$) equipment, which needs to be installed properly (not with drywall screws) and it should solve your problem. I wouldn't see you having a problem with buying some good speakers and using that sony xplod deck..it will probably give you good sound. I just personally don't like xplod products.


EDIT: sorry, forgot yours is a 4dr...you won't have 6x9's in the back...look here for your speaker sizes.

 

thank you edit on ur link it says something about dash speakers where are they cause i dont remember ever seeing any.