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This weekend I got a pair of Illusion Nd-12's. I did some testing and found they have great SQ in a 1.2 cubic foot box. Which is precisely what Illusion recommends, the SPL wasn't great, the sub started making some bad sounds at higher volumes. We used a punch 225.2 bridged to test the sub, and a Image dynamics component set for mids and highs. I don't have any hard numbers for SPL because that wasn't the purpose for the testing, and frankly I don't think the would be impressive. I haven't heard anything about their subs on this site or any others and thought others might be curious also.
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