Probably the zv4 12"s imo
I have a rev 1 12. It's a beast. My buddy has an x 12..its ok.
Can you listen to em first at all?
I'm sure the difference will be marginal...
But I would go for the z's if the price isn't too much more
Bc2000d - jvf FI BL 15" - s800/4
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