Radio/Speaker Experts

[Pete]

Anybody know if i can use the stock Bose speakers with regular radio.

If i take the amps out form the speakers and wire them direct with a regular CD indash radio.

I was told speakers will over heat/burn out the amp in the radio,something about ohms or some electrical compatibility i don't know much about radio stuff. True/False??

I installed a cheap Sony CD radio 45watts X 4, took the amps out from speakers ran new wire from speakers to radio,works fine but need to know long term pros and cons.

Pete