When it comes to wire, it isn't rocket science. When you read a website, it is usually immediate that you can tell a site that is speaking OPINON vs. actual testing. Many of us have literally tried what you are stating and are simply trying to save you the trouble. No harm in you doing it for yourself, because I did too, but I am telling you what myself and many others here have already found out both through research and real world comparisons.
There is literally a whole industry in audio based on trying to fool people with marketing BS into buying products they cannot back up or offer a single shred of proof their claims are valid. That inline box is about as good of an example as you can find.
If you are going to do the test, have someone else there who can swap the cables and then let you listen without you knowing which wires you are listening to. If you don't do this, then it is not an objective comparison. Seeing the wires in question will influence your opinion, something your ears can't do anything about. Believing you will hear a difference is enough to sway what you think you hear.
