You can't connect any modern TV directly to passive speakers. Passive speakers don't have a power cord and connect with a two conductor wire. The wire might be bare, have RCA or a different kind of plug to connect them to an amp or av receiver to power them.
Google shows nothing about RC6600, could be speakers from a set, the HT6600? Don't know. Post some clear pictures on the back of both pieces, looking at what connectors they have immediately would tell what you can do with them.
You can't connect any modern TV directly to passive speakers. Passive speakers don't have a power cord and connect with a two conductor wire. The wire might be bare, have RCA or a different kind of plug to connect them to an amp or av receiver to power them.