5.1 speaker setup.
From your description, it sounds like you need an AVR (Audio Video Receiver) in your system. You can buy an inexpensive DVR, I use Denon for my system, with 3 or 4 HDMI inputs and at least 1 HDMI output. The more HDMI inputs you have the better off you are. Plug your sony bluray, LG DVD recorder, etc. into your receiver. You then plug an HDMI output on the receiver into the HDMI input on the Sony TV. Your AVR
will control the sound and will upgrade all signals that need it to HD content on your TV. It will do the trick. Hope this helps.