John,

I read the same article you did about the 600 somehow creating feedback through the 80s. This is one of the first things I tried to replicate when I got my 600 and I just couldn't do it. Perhaps there was a problem that Axiom solved early on...I don't know.

You are missing a tremendous amount of the audio experience without a sub unless you listen only to flute music \:\) .

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated