My thoughts exactly although earlier versions of subs had that port chuff issue. I haven't heard any later sub versions to see if it has been curtailed.
I must be tone deaf, cuase I never heard this "port chuff" you speak of in any of my ported Axiom subs (two 500's and the 600). I think some folks spend way too much time trying to come up with crap to bitch about with respect to speakers and subs.
The new 500's I'm using do sound 'different' than the old ones. More precise, tighter, but that's about it.
I still love my 600.
