Last weekend, I played in a theater with my wireless system plugged into the rear input.
During the break a stage aid changed batteries in all wireless systems on stage. While doing that he accidentally unplugged the cable form the rear input. It was very dark on stage so he plugged it into the front input.
As a good technician, he knew where the output signal of a transmitter must go.
Believe it or not. I did not hear any difference. Neither did the audience (1000 guests) nor my fellow musicians.
And this although I dialed in 1M+CAP at front input.
I was sorely disappointed afterwards that I didn't hear the difference. But to my apology I must say that I was probably too much put off by the musical performance of the musicians, the singers and the dancers. And reading the music also additionally distracted my attention.
Fortunately, the show went fantastically, standing ovation, satisfied artistic director. Later, a fantastic meal in an Italian restaurant.
But I will work in the next few days to train my hearing so that I can recognize the difference between the various impedances.
Because we all know what really matters.