Book shelf speakers?

[newbe351]

I read here or on another forum where someone cut down a pair of bookshelf speakers (Sony I believe) and stuck them under the seat. Is this a viable option? Being electronically challenged, can you run home speakers with a car radio? I'm probably looking at the Retrosound radio for my '66, but am having some trouble coming up with speaker ideas. I hear bad things about the kick panel speakers and besides just completed the interior including the kick panels and don't want undo what I just did. Would something like the Bose Acoustimass (or whatever they're called) cube speakers work under the seats?

Thanks