Designing my first box. Need help with tuning!

[bunkrd you 10+ year member]

So i am using this formula Tuning a ported box

I am using tube ports, but in the formula I need to know how to calculate in two ports. My final volume after all displacements are figured in is 5.09198 cubes(assuming each sub is .25 cubes) that is with the bracing and whatnot. I want it tuned around 34 hz using a couple 4" tubes. I need to know the length for each given tube.

Help?

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[bunkrd you 10+ year member]

LinearTeam here I entered in 4 2" ports and got my desired port length of 2.88 inches. Does this soung correct for a final tuning of

 

[DonH 5,000+ posts]

i suggest 3 4" flared aero's. to achieve 34hz each port will need to measure 15.6" in length (excluding the flared portion about 3" per flare)

 

[bunkrd you 10+ year member]

2" Port Tube Subwoofer Sub Woofer Speaker Box Pro Audio - eBay (item 300363966182 end time Oct-30-10 18:12:54 PDT)

I was going to get 4 of those.

Precision Port 4" Flared Port Tube Kit | Parts-Express.com

how do I cut them to length while still keeping both ends flared? and whats the best placement on my box for these to go?

 

[bunkrd you 10+ year member]

thanks in advanced and on linear teams websit it said with 3 4" ports it would be 14.3 inches or does the 15.6 figure only happen on the flared ports?

 

[bunkrd you 10+ year member]

Got 3 4" aero ports. Will be starting my box tommorow and I am still undecided as to placements for these. You think one on the top back left ,center,and right will do?