What kind of TV doesn't have an audio out? It must be real old. I'd ditch it.

Your best option if you have cable TV available where you live (hey if you don't have an audio out maybe they haven't heard of cable either there) is to get a DVR obviously it won't be HD DVR based on what your saying and you can then get surround sound from that via an optical cable or other type cables. You might also be able to do the same with a digital cable TV box as well.