Question about Dual Sub Box and Ports - LoneRanger U Out There?

[AllStar1500bd 5,000+ posts]

Quick question about a dual sub box. I have 2 Fosgate RFR3115 Power HX2 15"s. I just constructed my first enclosure today.... all of it but the port. There are both using the same airspace, there is no divider or baffle in between them.

Since RF's "recommended" box size is 3.5 cubes, I built the box to 7 cubes. It recommends a port size of 49 sq inches to tune it to 32 hz. Now, since I doubled the box from 3.5 to 7 cubes, would I have to double the port size from 49 sq inches to 96 sq in to keep the same frequency? Please help because I am stuck. Thanks

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[AllStar1500bd 5,000+ posts]

Is there anybody that can answer this question?

 

[bigbassman Premium Member]

you'd have to make the port larger as well...

Loyd L.

 

[AllStar1500bd 5,000+ posts]

OK thanks, but do I have to double it exactly, or is there a happy medium between the two?