412Mark Posted September 16, 2015 Report Share Posted September 16, 2015 I have a pair of hdc3-12s and looking for help on the box design. I'm pushing them with a sq-2200d. AMI suggests 3 cubes per sub with 18 square inches of port per cube and tuned to 34-39hertz for the older style subs I have on 1000 watts. I want to try it close to his suggestions but on the lower side of his tuning range. So I am looking at a box of 6 cubes with 108 square inches of port tuned to 34-35 hertz. The dimension I have is 15 3/4 high 33 3/4 wide and 32 front to back. Subs will be facing forward sealed off trunk. If any dimension could be smaller I would go with the front to back Link to comment Share on other sites More sharing options...
Joe X Posted September 17, 2015 Report Share Posted September 17, 2015 So here is a suggestion using your max dimensions, power: to subs rated, amp subsonic filter to 28Hz, minimum port clearance 7 1/2", figure is just an assembly guide, bracing is 1 1/4" wooden dowel rods: NOTE: If building outside you need to build a cardboard dummy box to test fit in it's way inside. Link to comment Share on other sites More sharing options...
412Mark Posted September 17, 2015 Author Report Share Posted September 17, 2015 Looks like I can't get the full 6 cubes in my trunk I do want to upgrade my amp to the q1-4500 after I get my alt and my batteries to handle that much power. He does suggest a smaller box with a little less port for 2k a sub. How much a difference would 5 cubes with 85 square inches of port still tuned to the 34-35 hertz range make. I am hoping to have enough room behind the box for room for batteries. If it don't the only other option I would have is using the wheel well for more air space Link to comment Share on other sites More sharing options...
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