Originally Posted by MojaveJoe
Is there a display on the amp that says what signal is being received or output?
On the right side of the display panel, there is a collection of small boxes, arrayed so as to represent the signal being input from the source (i.e. from your PS3).
If you only see two boxes, that's 2-channel stereo input. If you see 5 boxes, arranged like L/C/R/LS/RS around a central listener, that's 5.1 input. 7 boxes, that's 7.1.
Incidentally, there is a "straight" button on the remote that simply passes through whatever comes in to the output (amp, speakers) with no processing of any kind by the receiver. So if you push that button, and your input display shows 5 or 7 boxes, you should be hearing sound from those 5 or 7 speakers.
Now as far as using an HDMI splitter... well if your TV can't receive 5.1, maybe your PS3 is shutting down its audio to 2-channel stereo which is acceptable to the TV. And the splitter is feeding the same 2-channel stereo signal to the receiver.
How about experimenting by disconnecting the TV, just running BluRay from PS3 to the receiver, and look at the "input signal" boxes on the right side of the display. If you now see all 5 boxes then you know it's the HDMI splitter and the connection of your TV that is causing the PS3 to drop down from 5.1 to 2-channel stereo.
Why don't you just go straight from PS3 to the receiver via HDMI, and then receiver to TV via HDMI? That's what the receiver is for... to act as an HDMI switch. That way you can have other HD sources (e.g. your DVR from sat/cable) feeding the receiver via HDMI, and the receiver then feeds the TV via HDMI from whatever source you'd selected.
Why use an HDMI splitter from the PS3??