I am also running the 12w3 in a rear firing zenclosures.
It will hit every note with perfection, just make sure you have the crossover set correctly.
I am runnugn it off a 300/1 Kenwood amp and I have the gain at half way and it runs more than enough for rap and hip hop. Look at the reccomended chart for the 12w3 on JL website.
It took me weeks to properly tune the sub, so if you have any quesitons dont hesistate to pm or ask me
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