@gournard Somebody here said their sub is too slow! No such thing as a slow, boomy or one-note-bass sub.
Before you criticize, make sure you know what you’re talking about. The “slowness” of a subwoofer does not refer to when the bass notes start (attack), but rather to when they stop. In fast passages, the bass note fails to stop in time before the next one begins — that’s the common understanding of subwoofer pace. Changing the phase, even discretely, does not affect or control when a note stops. I always prefer and use sealed-enclosure subs, but that alone doesn’t help much. I also use bass traps to reduce ringing from standing waves; this helps, but only slightly. Ultimately, control must come from the source.
I also tap the signal directly from the main-speaker terminals to take advantage of the main amp’s high damping factor. Again, this helps, but there’s still much left to be desired. The only thing I still hope to try before concluding this journey is a servo-controlled subwoofer.
So again, make sure you understand why there is no such thing as a truly ‘slow’ subwoofer. Do you really know what a slow sub sounds like? My colleague once complained that a large 12" sub was slow and swapped it for an 8" sub to address the issue. But until then, why would I even need a sub? If you feel you need a sub as a panacea to achieve a good soundstage, then either something is wrong with your main system, or you are not optimizing it properly.