No it has not! Research done show's both views. It depends on who did the testing and what results they want. Look at all testing just not the ones you choose to believe. See for your self. And I am not talking Monster cable, but other s like IXOS, Wireworld. I had the same mind set before I tried the better cables. My wife saw the different and I didnot even tell her I switched cables. She just asked if I did something to the TV because the picture was better.