I had this idea for a summer project to keep me entertained:

I have been reading about making home stereo speakers.

I want to do this using car speakers, not traditionally hi-fi speakers,
anyone tried it?

I like the look of Kenwood and Sony models, and I have my eye on the
KFC-1758S and XS-V1633.

It's just an idea for a project for the summer. I have a stereo amp which
will switch between 4 (cars) and 8 (Hi-Fi) ohms. I want to use this to drive
car speakers but
someone has told me that it won't work as cars fun on 12 volts (which I
knew). But thinking
about it and applying Ohms law (V = I x r) I don't see why the 12 volts
supplied by the battery
matters.

I am aware of the 4 ohm (car) and 8 ohm (hi-fi) difference. Any other
problems? Anyone have any experience?

Also, are all car speakers 4 ohms out of interest?

Thanks