Hi Ive bought a hdmi cable for my projector so i can play my ps3 on it but i was wondering can i use the 2 audio inputs on the av cable without the video input? the reason being i want to connect the hdmi lead from the ps3 to the projector and then have an av cable also coming off the ps3 to a hi-fi system. I know hdmi cables can be used for audio as well but i dont have a hdmi port on my hi-fi so im still using the av cable audio inputs for this. any help? thanks