Apologies for muddying the waters with the HK non-HK discussion (didn't catch the subtlety in the thread title).
I still think there are places where you can find speakers out there (crutchfield is a good start). Like I said, match the ohms and the physical size and you are golden.
http://www.allelectronics.com/make-a...peakers/1.html
http://www.alpine-usa.com/product/view/sps-410
Sorry Seth, but I still gently disagree and with the utmost respect, when you claim the head unit in our cars is "junk".