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So I am looking for a way to take 5.1/7.1 analog audio from a sound card and insert it into HDMI.
A decoder is available from Atlona, but for the life of me I cannot find an encoder/inserter box.
Good luck, that sounds too niche to be available at a reasonable price. Do you have an AV receiver that doesn't have analog inputs?
Thats behind my suggestion above.What video card do you have ?
https://support.amd.com/en-us/kb-articles/Pages/Audio-Frequently-Asked-Questions.aspx
You may be able to re-direct your sound output through the HDMI on the video card.
Costco sells the TSR-7810 for less than 500...
https://www.costco.com/Yamaha-TSR-7810-7.2-Channel-Network-AV-Receiver.product.100308760.html
Problem with using HDMI in is I want a setup for older machines that have sound cards such as the Audigy 2 ZS. If I were to just use a receiver with HDMI in, that would still require an encoder.
Ditch the old standalone sound cards and just use the HDMI audio included in every semi-modern video card? I mean even a $30 GT610 or such can do that. Pipe those to an AVR like others have mentioned... or maybe a $20 HDMI switch and output audio from your monitor (that... might not do 5.1 I guess it depends on the monitor).
Trying to do a multiple input/output 5.1 analog setup is going to be a huge chore.
This setup would be specifically for running older games on older systems that support EAX, etc. Show me a video car that can do that.
I'm talking Windows 98SE and XP era systems.
It really isn't that huge of a chore to set up a couple A/V switchboxes in order to handle 5.1. Just a bunch of wires.. and one extra button I have to press in order to do 5.1 instead of Stereo.