Is this not the advantage of an optical sound cable? A 10 foot cable is $8 on Amazon.
1.25% silver doesn't qualify as "solid" in my mind either.
"digital Ethernet cable" is straight out of the Department of Redundancy Department. And even 100% silver wouldn't change the sound one lick. It is transmitting digital data. 4.6 out of 5 on the reviews tho. The positive reviews are classic cases of confirmation bias: if I paid that much I expect it will be better! Only two reviewers didn't appreciate being separated from their money for no discernible improvement.
The Ethernet cable would presumably be sending digital data. As long as the environment that the cable is being used in is reasonable, the quality of the signal will not be improved because of better conductivity in the cable.
> optical sound cable
You’re probably talking about TosLink cables (what else could you be talking about?).
They have the bandwidth to carry two channels of uncompressed digital audio. Which is what they were designed for.
If you’re using one to carry 5.1 or 7.1 audio from your TV to your soundbar, it’s compressed. An HDMI cable can carry that uncompressed. And so could an Ethernet cable.