Think about what you are trying to achieve, which is great sound at your listening position. If you can't hear it at all from your seat, and it otherwise sounds as you wish, leave it alone.
If you stick your head in the corner of the room you will hear boomy bass but nobody considers that to be a problem since it sounds fine at the sweet spot. Why does a slight amount of noise that can only be heard near the speakers bother people so much?
There are ways to make a system completely quiet but at the expense of performance. A system that doesn't have any noise at all when you are close to the speakers is probably pretty lifeless anyway.
IMHO you are chasing ghosts.
If you stick your head in the corner of the room you will hear boomy bass but nobody considers that to be a problem since it sounds fine at the sweet spot. Why does a slight amount of noise that can only be heard near the speakers bother people so much?
There are ways to make a system completely quiet but at the expense of performance. A system that doesn't have any noise at all when you are close to the speakers is probably pretty lifeless anyway.
IMHO you are chasing ghosts.