wtb: 12 inch sub $350 max

Looking for a good sound quality sub. It has to work well on 1500w and a 2.5 cu box

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How many people have used the sda3 and compared to other subs to support your claim?

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Reading the specs makes it clear that they perform well in larger ported boxes. We recommend 2-2.5 cubes for a 12. They were designed to be an efficient sub optimal in large boxes and sound great for daily use.
They've proven that they work well for both goals in our Tahoe that took first in S3 at Freezefest and even beat the S4 scores. They are still in the preorder phase so no others are currently on the market, but they are only 30-45 days out at this point.

I can compare them to my DDZs, if that counts...

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Would a 12 like 39 hz 2.5 cubic feet 13 in per cubic feet.

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Yes that volume and port area would be perfect, tuning is a little high for my tastes but everyone is different in that aspect. It would be very loud tuned that high though, lows would just be limited.
2.5 cubes with 35 square inches of port is the "optimal" enclosure, of course it will change depending on power and install.

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