If you play just your subs you will probably hear male vocals in your subs this way. If it sounds fine… no big deal. The slope at your amps 80hz might not blend well with your mains. Maybe try a different slope if possible. If the slope is 12db for example it is out of phase and you would need to make the sub 180 degrees or change the leads on the speakers. Could just be nulls and room nodes
SVS SUB BETTER WITH LOW PASS FILTER OFF
After endless tweaking and experimentation, I have concluded beyond a shadow of a doubt, my system sounds profoundly better by turning OFF the SVS "low pass filter"! My amp has a sub out with a filter option set at 80 db's. Like all good audiophiles I carefully followed instructions, searched google to tweak all settings. I tried all variables in frequency. Until one fateful day, for no special reason, I turned it OFF. "WAIT", I said to myself. This sounds better. "Can't be!" "It must be boomy, or bloated, or congested .....or something bad. NO, it wasn't. It not only sounded more cohesive but the "hole" in the sound stage was gone. (I had a sense there was a perceptible hole in the musical picture which kept vaguely appearing which destroyed the whole overall enjoyment. I'm interested if anyone else has tried this heretical approach?