Originally Posted by
Steve Mac
The Q of the 605 speaker is lower than the 604 because of the magnet size, offering more low frequency response. But that doesn't make it better sounding by itself either in my opinion.
I've heard both speakers and in my opinion they are both grand, beautiful sounding speakers. I think that the knock that the 605 took was because of marketting idiocy and because of this it is one of the most misunderstood and underrated speakers ever designed. It will probably become extremely collectible someday what with the number made.
Just my opinion but I think they may be one of the most underrated speakers out there.