PS3 connection to Yamaha HTR-6130 Av Receiver

It could have to do with the settings on each input device (xbox & DVR) -check their audio settings. I have a better solution for your problem though:
Since HDMI supports 7.1 ch of digital sound, I'd recommend using the optical inputs on your HTR-6130 that are made for 5.1 ch sound. I agree that you should be getting sound via HDMI, I was able to from my xbox to my 6130, but it gets cut down to 2 channel sound (good, but pales compared to true 5.1 ch sound). It believe it has to do with Dolby not being backward compatible going from 7.1 to 5.1. Anyhow, in order to get an optical-out on your xbox, you'll need connect with the a/v cables that came with the xbox, along with the HDMI cable. Depending on how old your xbox is, and which model (like an elite edition, etc), You may need to buy a special converter that will allow enough room for both an HDMI connection and the A/V connection. Trust me, I have an HTR-6130 with an xbox and a cable-provider issued box running through it. Optical is the way to go for this particular receiver since it only supports 5.1 ch sound. You can still use the HDMI ports on the receiver as a switch between your two devices, or you could choose to bypass it if you TV has more than one HDMI input port.

Your receiver probably doesn't support audio over HDMI - according to specs, it has just hdmi switching, but not hdmi repeating.
You have to connect PS3 via optical spdif cable to the receiver.

http://www.yamaha.co.jp/manual/english/result.php?div_code=av
Try this site for your HTR-6130 user guide. Hope this helps.

The HTR 6130 only HDMI passthrought VIDEO, no sound. If u want sound u need to connect sound cables: rca, optical, etc.

its not how there connected its in your settings. rehook up all your speaker connections properly,then make sure you proram the reciever to recieve fiber optic,hdmi,digital coax etc in the reciver.

You will need an additional HDMI cord...you can get them without getting ripped off by purchasing at bluejeanscable.com.

Connect your HDMI out from the xbox to the receiver. Connect the additional HDMI cable to the "out" HDMI connection on the receiver and connect the other end of it to your TV.

You would need 1 component and 1 HDMI cable.

The HTR-6130 cannot decode HDMI audio. It can only act as an HDMI switch. To get the audio from the cable box to be output from the HTR-6130, you will need a separate audio connection (e.g. RCA cable).

The HTR-6130 does not decode the audio from the HDMI inputs. It only acts as a switcher. You will need a separate audio connection from the cable box to the HTR-6130.

Is Yamaha HTR-640 a receiver? Try HDMI from PS3 to receiver or Sony HDTV. If HDMI from PS3 to receiver the you need and HDMI from receiver to out Sony HDTV. You could connect everything to receiver and HDMI out to HDTV. You can not have an HDMI cable AND an optical cable coming out of the PS3, only one or the other.