Thanks, I believe what you are referring to is the bass management setting within each sound mode. I can’t exactly figure out if I want this on or off, as it seems the low pass filter is still active when it is on. Regardless, the problem persists if bass management is on or off. It still seems to be that the only variable that changes whether or not the BL19 is active is whether or not the speakers on the sound center are included in the same group.