Sounds like your midbass is severly lacking if you are hearing voice from your sub. If I turn off my flutes 70-500 HZ, maybe I could hear it but I know I def can't any other way.
Do you have like 0dB or 70Hz and up until you hit the PA mids? Maybe that is why you even notice it?
I have a PPI DSP so I can turn channels off to tune, but what are you listening to that it presents this problem?
Where the Governor is on a steak, the cops are on the take, and the welcoming committee is a sawed-off shotgun!