For any interested, Ian and I have beem emailing on whether the MF 2122 is centered, or off-set, within the "doghouse" subenclosure. I think we have sorted the mystery, but I will make confirmatory measurements this weekend. Here is an excerpt from an email to Ian:
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Hey, Ian...
Your logic appears spot-on. But, I have attached a more compelling picture, and perhaps better guesstimate to your question. This view is looking into the baffle-cut for the 2245H, up toward the doghouse. The 2245H is centered in the baffle, as you know.
The perspective is disorienting, but the view is from the base of the cabinet upwards into the cabinet body. This is of the RH cabinet, thus the ports are on the right. The vertical bracing holding the network is centered on the cabinet back, and thus, so is the 2122 doghouse.
The baffle width (measured inside the molding) is 28 inches wide.
Therefore, using the LH cabinet (where all the photos with the measure tape are collected), since the 2245H is centered, but the 2122 and 2421B are aligned but off mid-line (to the right in LH cabinet), and the approx. center of the 2122 is 17-in from baffle left edge (see relevant view on this Thread), versus baffle vertical mid-line at 14-in from baffle left edge, the 2122H is exactly 3-in "inside", or to the right of the mid-line (3-in right of mid-line in the LH cabinet, and 3-in left of mid-line in the RH cabinet). Thus, the 2122 is not centered within the doghouse.
Make sense?