port placement?

[Kadori 10+ year member]

alright so im going to put 3 3" flared ports in to a a dual 15 box with 4.88 cubes, its for my polk audio mm1540s and i was wondering where i should put the ports or if it mattered. Flared Port Tube 3" ID x 11" L with 5" Flared Ends 269-165

these are the ports

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[LosIsATool 5,000+ posts]

Not enough port

 

[Kadori 10+ year member]

the box is going to be tuned to 30hz and winISD said that what i needed

 

[groundpound4200 5,000+ posts]

What kind of vehicle is it going in? That's not going to be enough port... It's better to do fewer, larger diameter ports too. A single 8" flare would do much better.

Follow the basic rule of thumb regardless of what WinISD says. 12-16 square inches of port per cubic foot of box volume.

 

[Kadori 10+ year member]

/its going in the trunk of my 02 accord. can i just pick up a huge piece of pvc? and use that? or do need to do more