You are correct about the pro being the $600.00 unit. I would say you are also correct concerning the 3 d imaging it enforces. It is hard to describe, but you don't know the grunge is there until you have used the Symphony and then removed it. The voices (Diana Krall and Jacintha for instance) take in a more corporeal existence. The voices become more round, but not bulbous. It really is worth audiotioning. It did much more for my system than the $2,300.00 Marigo power filter I tried.
