AVS Forum Special Member
Join Date: Feb 2004
Location: Douglasville, GA
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Posting the model numbers of your equipment might help figure out what is/isn't possible with the equipment you already have. You mention that your Harmon Kardon AVR is "stereo", but also that it's 5.1, so knowing its capabilities is the first step. For the below, I'm assuming you have a Dolby Digital 5.1 capable AVR.
While it's possible to extract audio from HDMI and pass it via optical to your AVR, it can be a can of worms when it comes to what sources properly pass DD+ (Netflix, Amazon, etc), transcode to DD5.1 (which your AVR likely supports), or transcode to either DD2.0 or PCM 2.0. I don't know of an HDMI Audio Extractor that properly handles all of the HDMI EDID info (what tells your source device what your display or AVR is/isn't capable of playing back) AND properly converts DD+ to DD5.1... much less one that's affordable. There's also one older Roku model (the Ultra 4640) that has an optical output and does properly transcode DD+ sources, but it doesn't have the SD Composite Video + Analog Stereo (Red/White/Yellow) outputs you need for your existing display.
Personally, to make the best use of the equipment (I assume) you have, your best bet is probably to use it exactly how you have it set up, engage Dolby Pro-Logic/PLII for matrix/simulated surround, and call it a day. Otherwise, as mentioned, a new smart display with optical output may be the wiser upgrade path vs. sinking more money into adapting what you have on-hand IF you have the budget/desire to do so.
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