Hello, I just got some Logitech z506 5.1 speakers and I currently have a Hannspree ST42DMSB HDTV. I believe the speakers are for use with a graphics card for true 5.1 surround sound, but I am wondering how can I make it work with my TV so I can get true 5.1 sound on it as well? Any help is appreciated as I am pretty lost. The speakers come with 3.5mm audio cables, but my TV only has HDMI, RCA, and Coaxial. Is there a way to convert the signal?