I'm anxious to hear the 400 in your area sometime this week. Maybe I should bring my Sony and the Clapton CD too. Track 4 will hopefully show us what the difference is between the 400 and our low end subs as far as music is concerned. If the 400 can weave the bass between the music and involve you the way my 600 does, then it might be a keeper.

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