[Wayne A. Pflughaupt]

I dunno – typically a “real” null is pretty narrow. That thing’s more than 2-1/2 octaves wide.

Can this be fixed with a BFD?

I have my doubts, unless you have something like 30 miles of headroom. If not, it’s impossibly deep - 30 dB!!! Aside from that, the lowest filter setting the BFD can be set at is 20 Hz. Sure, you could affect lower with a really wide filter, and then EQ down everything above 30 Hz, but as noted, you would have to have a sub system – both amp(s) and driver(s) - that’s totally loafing right now, using maybe only 5-10% of their capability.

I’m can’t help but think there’s something we’re missing. I can’t say I’ve ever seen anything quite like this. Not in a corner, anyway... Are there any gaping holes in the wall - bar pass-through, doorway, etc. – near the sub?

Regards,
Wayne