USB PC speakers convert to RCA?

I have a set of Harmon Kardon soundsticks which sound great. However, I have no use for them as a PC speaker so was wondering if I could use them on my TV? They connect via USB-A.
I've tried them on my Sony TV through the USB port and nothing!
Is there a way to convert the male USB plug to male RCA plugs so I can use them as TV speakers? If so, any links to a suitable convertion cable?
Thanks
 
Back