The Black Box is a Low Frequency Resonator Array that works in conjunction with the Subwoofers, Atmospheres and FEQ X4 to solve bass node issues.
I let my current configuration of graphene oxide painted on alternate facing magnetic mats sit undisturbed for about 2 weeks. I listened for just over 2 hours last night. I didn't think my system could go farther in this regard but each musical image is rounder, smoother yet more dynamic. The soundstage is not more precise but is wider and deeper. I hear vocalists moving slightly closer to mics and then hear then move back. I hear slight tones coming-off the body of guitars and pianos. Its all kind of spooky but real.
I can't hardly believe it so I keep asking myself: what is going on? All I can conclude is the magnetic mats when stacked and painted with graphene oxide create a uniform and consistent magnetic field through the component. This magnetic field stabilizes over time and its natural "spinning effect" stabilizes not only the signal flow but the circuits themselves. Subjectively, I guess it really doesn't matter why the sound is improving - all that matters is: it is.