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Old 09-03-2010, 12:12 PM
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Default Box size for two DD 9518's

What should i do for box size for two 9518D's? Its going in the rear of a 97 yukon. My max width is like 48" and around 32 or so for depth. I would like to keep it below the rear window or not much above the window, so around 20-22" is about as high as i want to go.

I was thinking just do subs up, port back? Sound good?

How much space should i leave between the port and the rear doors?

I was thinking do a long port at the bottom of the box all the way across, or should i do something else?

Also, im sending in my 15's to get turned into 18's to do this, and only sending in one at the moment, if i build the box for two subs and only cut the hole for one and use it, will it be bad cuz the box will be pretty big..
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Old 09-16-2010, 05:31 PM
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Anyone? Im going to power the subs with two Planet Audio RXD2400 amps, 2400rms @ 1 ohm each. Should i just make the box as big as as much room i want to take up?
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Old 09-16-2010, 05:38 PM
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11ft
tune in mid 30's
lot of port
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Old 09-16-2010, 05:43 PM
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you could go to DDs site and get box specs there. I've done subs up, full-width slot port back. Be sure to account that if the distance from the box to the back wall ~ port height, it'll BE port. Kinda handy if you're tight on space.
Hmm.. i guess after reading this, i shoulda been making subs up, port up :P dayum.
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Old 09-16-2010, 05:47 PM
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I'd do subs up port back 12 cubes tuned to 34hz.
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Old 09-16-2010, 06:05 PM
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Ive asked before, dont think i got an answer, but what will the difference be in a smaller port vs a bigger port, since you say go with alot of port? I ask because my buddy had a box similar to mine in size, port was smaller and it was just loud as hell. No idea what it was tuned to, he just threw the box together not knowing what it would be tuned to.

I think ill do the subs up port back, seems to be most common and alot say it works best in suv's..

If i make the box for the two 18's and only cut one sub hole and use one sub, will that be a bad idea until i get the other sub? I can run it off my ap15001d til i get the other sub in if that would help.
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Old 09-16-2010, 06:22 PM
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Ok i just measured again and it looks like about my max dimensions are 48" wide, 22" tall (to top of seat about) and around 36" deep. According to the 12volt.com that gives me like 19 cubes, correct?

How far away should i make the port from the rear doors? It has the split doors, some call them "barn doors".. I dont want it too close to the rear right? Any idea on how far away i should make it? If i can make the box any shorter instead of 22" i will prolly wana do that, around 20" or so if i can.

Port on the bottom of the box? All the way across and like 5-6" high?
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Old 09-16-2010, 06:26 PM
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you wont need 19 cubes for 2 18s so yes you can probably make your box shorter
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Old 09-16-2010, 06:35 PM
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Ok ill prolly make the box 48" wide, and 20" tall or maybe even less if it ends up being more space than i need. Still need an idea on how far away the port should be from the rear of the truck tho.
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Old 09-16-2010, 06:41 PM
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i've always heard ATLEAST the width of your port from the rear. your best bet would probably be to build the box 12 cu. ft like previously suggested which would more than likely give you enough space that you could move the box back and forth to see where it sounds/meters the best.
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