You should go from the DirecTv box to the receiver first, with video and especially audio. Going through the receiver with the video will make it much easier switching sources. So, you'll need another set of component cables to go from receiver to the tv. You can go straight to tv with component cables from sat box, but don't forget to change the input of the tv, to whatever input you use for the sat box, to watch tv. The tv isn't meant to pass the audio out to the receiver, unless you're using the built-in tuner, and an antenna. It won't daisy chain and get surround sound.
The DirecTv box should have either a digital coax or optical output, for audio. Digital coax output will be an RCA type connection, that's color coded orange or black. Also, go into the sat box setup menus, and make sure the audio output is set to "Dolby Digital".
For the ps3, if it has component outputs, I'd use them, going to the receiver first (since the tv is just 720p). Again, makes for easier switching. Then use the optical output for the audio, to the receiver. If you go from ps3 to tv with video, remember to change the input on the tv, to whichever input you used.
Most people use 12 AWG or 14 AWG wire for the speakers. 16 AWG is ok, but heavier wire is better, especially on longer runs (12 is heaviest of the 3).
Set up this way, Pro Logic II should come from all the speakers (for tv), but rear speakers are used less than the front three. They aren't constantly used. They're more for ambient noises. Most movies played on ps3 will be in 5.1/6.1 surround. Only very old dvds may not be 5.1 surround.
In receiver's setup menus, make sure all speakers are enabled. Set the distances (delay) from each speaker too. If you have all this set right, and you don't get sound from all speakers, something is wrong.
Quote:
***Is it going to be possible for me to watch DVD's through my ps3's blu ray player and listen to them thru 5.1 without using HDMI and going with a optical cable only?
Edited by dtmason - Today at 7:27 pm
Yes.
Optical, digital coax, and HDMI, are the only way to get real 5.1 surround, except for 5.1/7.1 multi-channel analog outputs. But the ps3 doesn't have the multi-channel analog outputs.
Of course, you still need the HDMI or component for the video...............