So here I have measurements for a single Mirage BPS-400 & Mirage OM-200. I know one is ported and one is sealed but I gifted these two subs to my father after recently “refurbing” the BPS. The green run is Audyssey Multi EQ XT32 on a Marantz SR6011 limited to 300hz. The red run is after a slight adjustment to the distance in the AVR and the two purplish runs are after additional distance adjustment. I’m sure I can do better, but the BPS is 110lbs and not very easy to lug around, however I’m blown away by how much of a difference there is at the dip at 100hz-ish made by adjusting the time delay! I’m still very much a novice in home theater tweaking and over the last few years have really tried to grasp the more advanced stuff.