If your speakers are passive (no power cord) then you will need an integrated amplifier or receiver to power them. Most TVs have optical digital audio out so you would need a receiver with optical input (any AV receiver). If you wanted to use a stereo receiver then a DAC like this one http/www.parts-express.com/parts-express-dac-digital-to-analog-converter-%2851-compatible%29--180-999
could be used to convert to analog. Your TV volume control would not control the volume of the speakers so you would want remote control on the receiver.