4th order port through rear deck need design help, and build help in MN or IA area - Car Audio Classifieds!
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Old 05-21-2011, 09:51 AM
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Default 4th order port through rear deck need design help, and build help in MN or IA area

I have 1 (soon a second) PSI platform one 12s that I plan on putting into a 4th order box in my trunk that I am going to port trough the rear deck (I will be cutting a hole through the rear deck so I want to be sure the box port is right lol).

Currently I'm thinking about a box 40 wide by 15 heigh by 18 deep. This ends up being 6.25 cubes approximately before any discplacements. I don't know what the exact discplacement of a 12 inch sub is, and can't remember what I used to calculate before. That's not the big discplacement issues anyway. The port will be mostly internal, but a bit of it will be external because I want it to actually fit up to the hole I'm cutting in the rear deck. I can cut up to an 8 inch square port through the deck, and from the top of the box to the bottom of the deck is 4-6 inches depending on where the port would fall (slightly sloped floor). I can adjust the depth of the box but the width and height are constrained by trunk size. So I have some flexability to adjust for the possible partially internal port

David at PSI recommended 1 cube sealed and 1.5 ported for these subs in there respective box types, but I don't know if that corresponds to 4th order as well (so I usedthose numbers for my rough calcs). I really don't know much of anything when it comes to port calculations.

I also have some concerns as well about the rear deck porting, I really want to do it because I don't have a ski hole and I hate trunk rattles. I am concerned about possible damage to the rear window seal/window itself having all of the sub energy firing directly at it in close proximity. If anybody has done something like this and can ease my mind or confirm my worries I would appreciate it. The car is a 2007 Mazda 6 sedan.
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Old 05-21-2011, 04:56 PM
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are you planning on using an aero port?
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Old 05-21-2011, 04:59 PM
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I'm open to any kind of port that would be best, the port setup is the part I'm most lost on
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Old 05-21-2011, 05:07 PM
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Sealed the box so its firing into the backseat using dynomat or something similar youll also havent to use it on the rear deck to keep that from rattling
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Old 05-21-2011, 05:15 PM
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Im also planning on doing a 4th order but with an aero port. I would like to port it through the rear deck but dont want to ruin it and i dont have an arm rest to create a skipass.

this is kind of what im going to be doing
Enclosure Build: 4th order SA8s for dacheatham

or this

Enclosure Build: 4th order for 2 DD 1508s
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Old 05-21-2011, 05:20 PM
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pics and sizes would really help me design something for you
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Old 05-21-2011, 09:19 PM
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Ok, well here's some crappy pictures of the trunk area. On the left and right sides you can see the small radius in the corners which is where the 40 inch wide constraints come from. If the designer were to be the builder as well then they could build over that radius, I just don't have the tools to be able to do the intricate cuts necessary, in fact id love it to be able to be full width available to keep the depth as little as possible.
The main beam across the top is where the 15 inch height constraint comes from, the beam is 16 inches from the floor. That is a hard number as I'm not willing to cut the beam.
Just to the rear of the beam (toward the rear of the car) you can see where I plan to cut. There is a circular feature in the deck metal and I will cut there. I can go round or square, doesn't matter. I haven't decided if I wil cut through just the steal, or through the plastic/fabric cover as well, that will depend on what it sounds and/or looks like.





Last edited by maddog2099; 05-21-2011 at 09:35 PM.
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