I have a panasonic TV TH-42PX60U with two av in ports on the back, and a panasonic home theater SA-HT740 with one av out port on the back. My question is I have the roku 3 with the HDMI cable plugged in to the back of the TV wich only allows the TV speakers to work. Is there a way to hook up the Roku 3 so the sound comes from the surround sound or is my equipment to old?