how can i figure out a box for 2 18 btls

[RAB 10+ year member]

can someone help me on tune a box for 2 fi 18" btls my net cf is 9 cf without displacements.any help will be appreciated

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[Brian Owens 10+ year member]

What are the box dimensions? It helps when creating the port. . .

I hope that is 9 ft per sub, not total. If it is total, you needed to buy 15's.

 

[RAB 10+ year member]

42.5x24x18.5 these are outside dimensions

 

[RAB 10+ year member]

9cf is total for both

 

[Pioneer~Saturn 5,000+ posts]

I have mine on 4.5-4.6 cubes net (old-model, fully loaded 18 BTL) and it does the job...I wouldnt worry too much about the 9 cubes net...

 

[Brian Owens 10+ year member]

That is not enough air space for (2) BTL 18's.

Did you already buy them? That box would work MUCH better for (2) 15's.

I assume that is 42.5 W x 24 D x 18.5 H. You could use a 17" H x 6" W port. Run it into the box so it is 7" from the back wall. Leaves you with 7 ft^3 tuned close to 34 Hz.

I would just install (1) 18" in that box.

 

[Brian Owens 10+ year member]

I have mine on 4.5-4.6 cubes net (old-model, fully loaded 18 BTL) and it does the job...I wouldnt worry too much about the 9 cubes net...

That is not 9 ft^3 NET. That is the volume before any displacements. . .

41 * 22.5 * 17 = 15682.5 / 1728 = 9.07 ft^3.

 

[Pioneer~Saturn 5,000+ posts]

Oh geeze, didnt see that...9 cubes before displacement will not do //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif...I wouldnt put them in that small of an enclosure...one 18 would do or I'd go with a pair of 15's like he^ said

 

[RAB 10+ year member]

thanks guys