Bigger is better with 604's, so it seems with some owners, especially with a large front baffle. I used the basic 620A cab with my old 604K's.
Here's an AA member "Garg0yle"'s monster ( 15-16^3) 604 corner cab build.... seems pretty large and impressive. When I get a another pair of 604's, and a set of corners in my upcoming house, I'll will try this cab myself.
I think he has detailed plans in the thread if I recall too.
-chris
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