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Old 07-23-2011, 10:13 PM
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hey guys i have had my hdc3 12 for about 5 months and i want to up grade to a hdc3 18. port and subwoofer point into the car and will be seald off from the trunk. powered by a AQ3500d.1 and 2 c&D liberty
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i want to know if this box will be ok W30 x H18 x L29 it would be 7.4 net. box volume would be 6.2 that is with all displacment port and sub tuned to 38hz 99" of port area

i am asking because i need to cut in to the upper deck. and if this box dose not work then i will just go with 1 15 hdc3

thanks guy in advance
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Old 07-23-2011, 10:21 PM
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Since your upgrading your 2 twelves have more cone area than the one fifteen and the eighteen doesn't have much more than the twelves. Plus your loosing motor strength also so not much of an upgrade.

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Old 07-23-2011, 10:25 PM
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o and i have sold my hdc3 12 already this friday so bass less agine
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Old 07-23-2011, 10:39 PM
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With the amount of space you are talking about I would go with a 15. I would say 2 12's but you already sold yours anyway.
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Old 07-23-2011, 10:43 PM
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HDC3 18 off of a 3500 would prefer a box around if not under 6ft3, no? The space should be there I'd think. Every other part of the Proper box equation I know nothing about though
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Old 07-23-2011, 11:16 PM
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well i am not going to be running it at at full tilt on 4300 rms probly 2k or 1.5k
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