I don't necessarily think it is just an Axiom subwoofer quality issue here but also price.
Axiom subs comparitively are expensive when put up against the likes of Hsu and Sunfire.
Price: performance is really more the key.
My EP350 rumbles plenty but sometimes i get the port chuff. Had i not had any port chuff, i would have still been happy with my EP350, but still would have preferred it cost less than $950Cdn.
Hence for what i paid, i'm not happy with my EP350.
So why did i not return it then you ask?
Because i never really tested it thoroughly enough before my 30d trial period had ended. I really only noticed the port chuff after i bought some dvds heavy in the low end that illicited the issue several months later.
"Those who preach the myths of audio are ignorant of truth. Research begets reality."