Audio Equipment and Home Theater Audio : Blu ray audio help

Blu ray audio help

I want to buy a blu ray player. Right now I have a panasonic all in one 5 dvd player and home theatre system. The problem is the only audio input is the older 2 (red and white) audio imput. eventually I am going to get a audio receiver but in the mean time, how bad will my blu-ray movies sound using this input?