This speaker sat on Craigslist for a month with the price steadily falling. "Rare Altec speaker - $400", then $300, then finally $200. I flirted with the idea off and on for weeks. One side of me said "it's a stupid 12 inch Biflex, leave it alone" the other side said "it's a 604, go get it right now". They were both right; I left it alone and the price came down AND it was a 604. I'm really enjoying it now driven by an EL84 amp with the balance all to one side. Does the N1600-B crossover benefit from being recapped? The cabinet is about 6 1/2 cubic feet, what will I gain going to the 9 cubic foot 620 cabinet?