2 18" Sub box?

[tv559 10+ year member]

I am about to install 2 18's in the back of a Gmc Sierra Ext. Cab. I will be taking the back seat out. My question is should I have the subs and port facing up or Subs facing forward and port up. I was told to have the subs facing forward and port up but I would like more opinions on this.

Thanks,

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[FurbiesAndBeans 10+ year member]

Just throwing this out... Subs forward, port forward.

Subs up, port to the side

 

[Dak446 10+ year member]

i have one 18, sub up, port up. idk how well that would work for two eighteens tho

 

[tv559 10+ year member]

Anyone else.

 

[azimuth 5,000+ posts]

both forward or both down

 

[Buck 5,000+ posts]

If your port is not up, make it as close to the floor as you can.

 

[norcrawler 10+ year member]

people in suv's normally go sub up port back (from what i hear)

extra cab trucks are pretty box shaped so idk. i dont think my shit would be as loud with port up and sub up..

 

[Buck 5,000+ posts]

Loudest I believe is port side sub forward or up, but I doubt you can do that with 2 18"s.

 

[WildSebring 10+ year member]

Subs forward, port forward on drivers side...ftw..

 

[tv559 10+ year member]

Any other suggestions?

 

[01 S 10 10+ year member]

wall it, subs forward, port foward

do you really have 12 cubes net available in a "regular" box? you may need to wall it off anyways

 

[18inchjeepin 10+ year member]

Hunter on here has 3 subs forward and port up

 

[tv559 10+ year member]

wall it, subs forward, port foward
do you really have 12 cubes net available in a "regular" box? you may need to wall it off anyways

With the measurement I did I have about 19 C.F. Gross to work with. But I want 13 C.F. net.

 

[RAM_Designs 5,000+ posts]

Sub and port up will cause cancellation, and you'll notice that you're a good deal louder when you roll a window down or crack a door open. I've found that sub foward/port up works great. I'd assume sub up/port forward would basically do the same thing. I've never tried firing the port to the side...my ports are generally to long to do something like that, since I like to tune in the low 30's with a good deal of port area, and I end up with a 20-30" long port.

 

[tv559 10+ year member]

How much port area should I have? I want it tuned to 32Hz also.