Linus Tech Tips is a reputable YouTube tech channel. They’re currently investing a lot of money in a new facility so they can test different electronics / accessories.
It’s no surprise that a blind test showed that the claims AQVOX makes about improvements to sound quality are without merit. As the video states, we’re dealing with digital data. If there were audible changes in the sound, then the data must be different when received by the DAC.
You can test this yourself. Connect a PC to your audiophile switch. Select a music file to copy. Create a SHA-512 hash of the file (see below for some tips). Copy that music file to another PC on the switch, network attached storage, or even Google Drive (if you can reach the internet through the switch). Then copy that file back to a different location on the PC. Create a SHA-512 hash of the copy. Compare the SHA-512 ’fingerprints’. If they match, then you know the switch isn’t the source of the change in sound quality.
Generating a SHA-512 hash...
on Windows (at command prompt):
certutil -hashfile [file] sha512
on macOS (using Terminal):
shasum -a 512 [file]
on Linux
sha512sum [file]