not that much fading occurs. I can hear 12k pretty easily. Yeah, I can boost it and cut it a bit and it's not a huge difference, but the frequency is audible. 16k, not so much. My GF hears 16k about as easily as I hear 12-14, judging by how she reacts to tones when I turn it up, I let her tune my car on the top end for a competition once lol.