If you have a hair dryer or food processor this makes sense but variations in Sonic transmissions are the result of tiny changes in electrical impulses which perform so much better with the least amount of resistance, or impedance for those who want to be technically correct.
So anywhere along the food chain that you impede the electrical flow can be detrimental to what you hear if your system is good enough to allow you to perceive differences. And this is what's being evaluated herein

