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That's why I've always said using Optical/Toslink etc. is a mistake. Sending music with light just means you'll hear shade in your music.
Toslink is a bad example for your point. It is the same S/PDIF digital signal that is sent over fiber and it isn't even using laser but a standard diode, so won't even work long distance (shorter than if you would use the normal RCA cable with S/PDIF).
The most ridiculous thing I saw was the gold plated toslink cable.
DIY Perks just did a video where he modded a toslink TX to use a laser so he can do surround speakers wirelessly using line of sight.
That's cool, I didn't know him before, but looks like he has some extensive knowledge about audio or someone behind scenes is working with him.
The speakers he builds seem cool, but unless one has extensive audio knowledge at best can just replicate the same thing (assuming they can find all the parts used)
Saw this one yesterday. Pretty neat!!
Gold plated TOSLINK cables crack me up.