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Old 01-03-2013, 09:59 PM
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Default 2 hdc3 15" box tuning questions?

So I have a 1993 Chevy extended cab and am planning on running 2 hdc3 15" subs off a soundstream rubicon 2500 in the rear with the rear seat removed.

I looked on the audioque.com site for the recommended box specs and found the chart with cube specs(9 cu ft) and port specs(144 sq in X 18" long=1.5 cu ft). What I didnt find was what that spec box is tuned to. I would like to know what that comes out to. Hz?

I would like to go with 34 or 35 Hz. So if somebody could tweak this port to get that tune for me that would be awesome
This will be a daily system so im not worried about overall numbers, just want low and clean.

Will be ported up on the drivers side or each end. Would I run into problems porting at each end? Never tried it before but it might look nicer balanced out that way.

I will figure out the measurements in a little bit and post them up for more info to work off of. Thanks

Last edited by taron1265; 01-04-2013 at 01:19 AM. Reason: correction
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Old 01-04-2013, 01:17 AM
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I would also like to know 9 cubes is before or after port and woofer displacement
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Old 01-04-2013, 03:48 AM
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if those 9cuft are net. then its tuned to around 39hz
the best box i had for clean and low whas on one 15 @ 27hz 4cuft.


currently running one 18" sub on 5.5cuft box @ 31hz its louder yes but does not kill the lows as the 27hz one.

for your box to be @ 34-35hz 9cuft. net the port needs to be 27" long give or take
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Old 01-04-2013, 11:58 AM
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Thanks for the info. Definitely taken into considerationAfter looking at a couple online box calculators I have found that by using a port size of 22" high and 6- 1/2" (143 sq in) on a 9 cu ft box the port should be 21.83" long for 35Hz. Does this sound about right?
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Old 01-05-2013, 03:10 AM
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Yes that length should be right around 35Hz tuning...
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Old 01-05-2013, 03:46 AM
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Awesome. I wanted to make sure I did it right and used a reliable box calculator. Thanks for backing up my research. Glad I asked
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