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tyler_fitz
06-21-2007, 09:16 PM
Right now i've got a box in mind for a 15" Fi Q. its at 3.8 cubic feet (with all displacements taken into account) tuned to 30 hz. my question is would two 4" round ports be enough for this box?

BassAce
06-21-2007, 09:38 PM
That's about 25.14 square feet or port area, I think you should go with more port area. Do you have the option of using slotted or square ports? If you need to go with round ports, I would recommend using flared ports even better would be using two 6" flared ports.

tyler_fitz
06-21-2007, 10:26 PM
i could use some square ports. for the sake of symmetry, how would i tune my box using dual square ports? im lookin at something like 28 square inches per port...

Weeznur32
06-21-2007, 10:37 PM
I had almost the exact same box, 3.8 cubic feet with 2 4" aero ports and an 15 Q and my sub didn't like it very much, couldnt handle as much power. I rebuilt my box using a square port with like 50 square inches of port and that helped a lot. Just my input.

tyler_fitz
06-22-2007, 12:04 AM
alright, time to get less fancy with the design. plain ol rectangular box with slot ports. to calculate tuning for dual slot ports i divide the volume of the box by 2... right? and then calculate the length for each port from there...?

mlstrass
06-22-2007, 03:16 AM
Do you "have" to do dual slot ports? One would be much easier...

tyler_fitz
06-22-2007, 11:01 AM
how bout a single slot port.... but... its 3x18.5.... too narrow?

mlstrass
06-22-2007, 11:05 AM
Port 2 1/2" x 18 1/2" gives you 46^2 which is right on for 3.8^3. And no issues with being too narrow...

tyler_fitz
06-22-2007, 11:07 AM
excellent, now lets see if i can get this box built by the end of today...

mlstrass
06-22-2007, 11:12 AM
excellent, now lets see if i can get this box built by the end of today...

That's the right attitude, build away...:)

tyler_fitz
06-22-2007, 07:28 PM
UGH its so freakin hot out. got it mostly done, just gotta put the front on and then all the finishing touches... but i dont have a day off till next wednesday :crap: