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5.1 Audio from Games PC

• I have a reasonably up-to-date Windows 7 games PC connected to a TV and a receiver. All works well, but my game audio is in stereo and I'd really like it to be 5.1 surround. Help me achieve more pew pew and less QQ. Snowflakes inside. First, here is the equipment I have right now: Games PC with https://www.asus.com/us/Motherboards/Z97E/, NVidia http://www.geforce.com/hardware/desktop-gpus/geforce-gtx-660/specifications and https://www.asus.com/Sound/Xonar_DG/ sound card. (Link to http://speccy.piriform.com/results/G6Z3n0ATngHKba1eM5y0dku from https://www.piriform.com/speccy.) Vizio http://www.engadget.com/products/vizio/gallevia/gv47l/specs/ TV. (Link to http://mythopoeic.org/misc-files/moninfo.txt from http://www.entechtaiwan.com/util/moninfo.shtm.) Onkyo http://www.eu.onkyo.com/en/products/tx-sr307-35511.html receiver (with 5.1 speakers). Video path is: PC - (HDMI) - Receiver - (HDMI) - TV. The video part works great. I have never gotten the receiver to do anything to or with audio sent over HDMI. I don't think it can. The http://www.intl.onkyo.com/downloads/manuals/pdf/tx-sr307_manual_e.pdf contains the damning text: "Audio signals received by the HDMI IN jacks are output only by the HDMI OUT (Pass-Thru). HDMI sources are not output by the speakers connected to the AV receiver." Audio path is currently: Sound card - (TOSLINK optical cable) - Receiver This works, in the sense that sound comes out. If I use a source with pre-encoded DTS or Dolby Digital, I do indeed get 5.1. However, games are 2.0 only. Things I have tried: Using a riser board to get digital audio from the on-board audio chipset of the motherboard to an optical output: Same results as above. (I probably don't need the sound card -- its presence is just an artifact of my latest attempts to solve this problem.) Connecting the optical digital audio output on the TV to the receiver: I get 2.0 audio. The NVIDIA card thinks the TV is a 2.0 device, because the TV tells it so in the EDID block. Running six analog cables from the sound card (or motherboard) analog outputs to the receiver: Nope. The only analog audio inputs on the receiver are stereo (really!). Goals: I would like to 1) get decent 5.1 audio from PC games, 2) not spend an outlandish sum of money and 3) not spend any more money without a reasonable certainty of a good outcome. If I can 4) minimize the number of cables, 5) keep the signal digital all the way to the receiver and/or 6) not depend on grotesque hackery that will break with the next driver update, that's a bonus. Possible solutions I've considered, in descending order of perceived attractiveness: 1) Buy a new receiver that understands audio sent via HDMI. (This probably means that the receiver has to fudge the audio and speaker allocation parts of the EDID block.) Hopefully that would let me do away with the TOSLINK stuff and extra sound card. Challenge: How do I pick a receiver? What buzzword(s) should I look for when searching? (Con: Expensive. Pro: Will need to do so anyway in a few years when I upgrade to 4K.) 2) Get a new sound card with support for DTS Connect, DTS Interactive and/or Dolby Digital Live, such as the http://www.soundblaster.com/products/sound-blaster-recon3d-pcie.aspx#specs. Challenge: Would this actually do what I expect? Would my receiver understand the encoded audio? 3) Get some kind of HDMI-to-(HDMI plus TOSLINK) splitter likehttp://www.amazon.com/exec/obidos/ASIN/B00ISQ8VB8/metafilter-20/ref=nosim/. (Not sure that would help; I think my current receiver only understands DTS and Dolby Digital, so I suspect I'm boned unless I either replace it with one that does raw-PCM-over-HDMI, or add something that can encode DTS on the fly.) 4) Go back to the "TV optical audio out back to receiver" thing, and try to fool the NVidia driver into thinking there's a 5.1 system there via a hacked EDID block. (See above re: receiver needing DTS or Dolby Digital and there still being nothing to encode that.) 5) Upgrade (sidegrade?) to Windows 10 and see if that makes things magically better somehow. (Pro: Planning to install it anyway. Con: Virtually certain it won't help.) 6) Go to bed and read a book. 7) Play PC games with stereo sound like a chump. 8) Swear off all technology forever. 9) Get an XBone and play Madden with a cadre of racist 13-year-olds and your mum.

• Answer:

  AVSForum says that games don't know how to send 5.1 through TOSLINK. You need to use 3 Audio cables to send 3 analog channels to the receiver to get 5.1 out of the games. http://www.avsforum.com/forum/145-htpc-gaming/966518-evga-680-sli-built-sound-optical-output-can-t-get-5-1-output.html