Just wanted to let everyone know that I've been working with Brent and Amie via email. They have given me a few things to check tonight, so I'll keep you posted.
NEW2, I would not call my issue a distorted sound, but everyone describes things differently. I basically sounds like a vibration in the port when it reaches certain pressure levels. My guess is that something is touching the port inside (wire from the driver) or maybe just something that needs slightly tightened.
I don't think Axiom has any bad batches. If you look at the percentage of subs going out with no issues, I'm sure it is around 99% or so. In my experience with Computers and AV equipment, it is most likely something very simple.