I thought audio waves moved at the speed of sound, and light waves moved at the speed of light? This is the kind of crap I’m talking about.
At most frequencies, audio waves that are in the form of electrical signals travelling through cables travel at a substantial fraction (generally upwards of 100,000 miles per second) of the speed at which light moves through a vacuum (approximately 186,000 miles per second). The exact speed varies depending on the characteristics of the cable, especially what is known as the "dielectric constant" of its insulation.
An exception to that is audio at deep bass frequencies, which travel through cables more slowly but still at speeds of thousands of miles per second.
Audio waves that are in the form of sound travelling through air travel vastly more slowly, at roughly 0.2 miles per second, depending on the humidity and several other variables.
As mentioned, the speed of light in a vacuum is approximately 186,000 miles per second. It is somewhat slower in other media, such as glass, just as the speed of electrical signals is dependent on the characteristics of the cables that are conducting them.
I hope that addresses the concerns expressed in the second of the two sentences that I quoted from your post.
Regards,
-- Al
