Hi. That was nice of him! Much easier to visualize.
What frequency are you using to crossover to your other speakers?
Also, did you experiment with the port plugging and bass extension modes on the sub, along with phasing and placement, to try to get a flatter response? Just curious.
I don't know anything about that equalizer, so I can't speak to that. I would think that you could tell a difference if you could flatten out that peak around 31.5 Hz.