AC Cab speaker question

I am now looking at changing out my rear speakers in my truck soon. I have a sony head unit, and no amp. What have you found to be a good speaker for the rear doors of the truck? What size and brand do you like?...I'm not going to put in a box at all. I use all the rear space in the truck. My head unit puts out 54 watts at the moment. I know alot of you are going to say put in an amp,but I don't want to. I just want something thats good quality.

Thanks!

 

Pioneer TS-a1672

6 1/2" 3 way co-ax speakers.

I think they sound great, and I would have nothing other than pioneer ts-a series speakers in anything I own.

 

Pioneers are a great choice and running them off a good head unit will be fine for most people.

 

Infinity is def. the best. Ref. or Capp.