I have an Emerson LC 320EM93 flat-screen TV, which (foolishly in my opinion) DOESN'T have speaker drive, and DOESN'T even have RCA (1 volt) audio outputs. What the manual says it has is a "coaxial digital audio output jack". I have two nice large speakers, bought 30 years ago, which are just as nice as the day they were purchased. I need to drive those speakers. But how? The answer would be easy, if the TV had what it should have. But it doesn't.
You need a surround sound receiver. It will have a coaxial digital input and will power the speakers. If you have a stereo receiver or integrated amp to power the speakers then you can get a digital to analog converter to connect it to the TV such as this http://www.amazon.com/Digital-Optical-Toslink-Analog-Co...
New TVs do not have amplifiers in them or analog outputs since these add to cost and require more space.