I had a weird problem with the optical output of the PS2 when trying to hook it up to my Spherex Xbox 5.1 surround kit. Basically, when hooked up directly, I never was able to get any sound out of it. I tried everything, and nothing ever worked. I found out that the only way to make it work is by connecting the optical output of the PS2 to my Audio Authority component switcher, and having the switcher convert the optical signal to a coaxial signal. Now it works, but I really don't understand why......