I hadn't thought of doing this; I just informally tested mine to find I've got a dead zone between ~13kHz and ~14.5kHz. I can hear the sound above and below tha

I hadn't thought of doing this; I just informally tested mine to find I've got a dead zone between ~13kHz and ~14.5kHz. I can hear the sound above and below that range - it fades out, then back in as I move higher in frequency.