I am searching for a product that I am not sure exists. Right now, I have a HDTV outputting analog sound (through RCA) to a powered sub which crosses over and then outputs to two powered mains (again through RCA). I would like to get three more of the powered speakers, and get a 5.1 system. To do this, I would need to output from the TV to some kind of brain that could accept an optical digital signal, and output to 5.1 balanced or unbalanced analog audio. I am completely uninterested in getting a receiver to manage audio/video, since signal routing and sound quality are already perfect, so getting a receiver with an amp and all seems like overkill. On the other end, pre-amps are often priced at thousands of dollars, and are intended to broadcast to high end amps, not powered speakers. Is there a simple part that I do not know about that can solve my problem without adding another remote? Thanks!