How do you install TV speakers in a car?

Don't disagree with other answer, but if the speakers are a different shape/size from the ones the car is designed for, you may have some difficulty fixing them in the car. As far as I know all cars now come with front speakers in the doors and rear speakers in a frame behind the back seats. If there aren't any speakers there should still be speaker wires in those places. Make sure you wire the speakers the same - there isn't a right/wrong way to wire ONE speaker but a stereo pair need to move in the same direction. The cables are usually colour-coded the same, or one of each pair has a stripe. If you get the connections wrong it won't do any harm but there will be reduced volume. If unsure listen to them, then reverse wires on one speaker and listen again, the loudest one will be the right connection.