bitflipper
That's actually not a bad suggestion, Jay. It might just dampen that artificial boost. It won't compensate for the total lack of content below the port frequency, but it could at least soften the unnatural bump at 120 Hz. I'd use a pair of heavy wool socks rather than foam, though.
Wish I could take credit Bit, but that Mixing Secret originated with Mike Senior. He suggests it exactly as you describe, not a fix, but to see better how the port unnaturally pumps the lows. And yep, sox gotta be better than foam. Course I'm already usin most of em for dust covers on my mics. Oh well...I'll just go barefoot, get some moonshine jugs with candles stuck in em, and see if I can draw some Nashville business. If all else fails, most of my clans from three counties well north o Raleigh, back to my roots, yeehaa!