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1 Round Port Enough?


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My friend wants me to build him a box and he wants it ported and he wants to have a round port / round ports.

The box will be 3.1^3 with a 4" port / ports, I just want to know if 1 port will be enough port area or if I need to put two or three in.

Thanks guy's

2 Infinity Reference 1252w 12s

4.2 cubic foot box tuned to 28hz

Sub amp: 1 Profile AP1200

Speaker amp: 1 Sony Xplod XM-504z

Kenwood eXcelon KDC-X492

4 and 8 Gauge Knu

Big III In 1/0

All in my 90 Accord

f05112e8-c6ca-4f78-9a8d-47be99303c8b_zps

Diamonds are forever, but 9's end that shit fast....

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Anybody? I wanna start this bish. :D

2 Infinity Reference 1252w 12s

4.2 cubic foot box tuned to 28hz

Sub amp: 1 Profile AP1200

Speaker amp: 1 Sony Xplod XM-504z

Kenwood eXcelon KDC-X492

4 and 8 Gauge Knu

Big III In 1/0

All in my 90 Accord

f05112e8-c6ca-4f78-9a8d-47be99303c8b_zps

Diamonds are forever, but 9's end that shit fast....

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Anybody? I wanna start this bish. :D

If he wants to compete in a IASCA rookie class one 4 incher is all he can have....other wise use more

2010 IDBL Rookie 1 North American Champion

2009 IDBL Rookie 1 Fl State Champion

2009 EBB Fly Weight 3rd Place Fl State Finals

2006 Silver Grand Prix GXP :Diablo Audio Hellfire 1000.1, JL Audio 300/4, One 13W7, ZR650, VR690, JL Cleansweep setup.

Team Pure Pressure

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12-16 in2 of port surface area per 1 cubic foot of box volume...is a pretty good rule of thumb

I would think 2 should be ok....remember to try to keep the round ports a full diameter off the inside walls

2010 IDBL Rookie 1 North American Champion

2009 IDBL Rookie 1 Fl State Champion

2009 EBB Fly Weight 3rd Place Fl State Finals

2006 Silver Grand Prix GXP :Diablo Audio Hellfire 1000.1, JL Audio 300/4, One 13W7, ZR650, VR690, JL Cleansweep setup.

Team Pure Pressure

dat12.jpgkonfused22copyn.gif

logottu.jpgproductimage.jpgpoweringlogosm.jpg

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Ok thanks, He just wants it for daily and I should have figured to just do the area of a circle. Duhh :wacko:

2 Infinity Reference 1252w 12s

4.2 cubic foot box tuned to 28hz

Sub amp: 1 Profile AP1200

Speaker amp: 1 Sony Xplod XM-504z

Kenwood eXcelon KDC-X492

4 and 8 Gauge Knu

Big III In 1/0

All in my 90 Accord

f05112e8-c6ca-4f78-9a8d-47be99303c8b_zps

Diamonds are forever, but 9's end that shit fast....

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Ok thanks, He just wants it for daily and I should have figured to just do the area of a circle. Duhh :wacko:

ha..no problem...I actually just built a box with one 4 inch aero port from precision ports....I compete in rookie 1. so that is all i can have.. I went from a slot port 1 inch by 14 inchs and I increased by nearly 3 db nearly 5 db with my door open. and it sounds much better...

2010 IDBL Rookie 1 North American Champion

2009 IDBL Rookie 1 Fl State Champion

2009 EBB Fly Weight 3rd Place Fl State Finals

2006 Silver Grand Prix GXP :Diablo Audio Hellfire 1000.1, JL Audio 300/4, One 13W7, ZR650, VR690, JL Cleansweep setup.

Team Pure Pressure

dat12.jpgkonfused22copyn.gif

logottu.jpgproductimage.jpgpoweringlogosm.jpg

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12-16sqin is for square or slot

more like 8-14 for aero as they move air more efficiently this you dont need as much port surface area

supposedly 50% more efficient

2 4" should be great but they will start to get long

2 4" ports using the entire 17" length in a 3.1cuft box yields a tuning of 34hz fyi... otherwise to go lower in tuning ud need to use ur own pvc tubing

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Need to know what sub and how much power to know if 1 port is enough.

Current system:

1997 Blazer - (4) Customer Fi NEO subs with (8) American Bass Elite 2800.1s

Previous systems:

2000 Suburban - (4) BTL 15's and (4) IA 40.1's = 157.7 dB at 37 Hz.

1992 Astro Van - (6) BTL 15's and (6) IA 40.1's = 159.7 dB at 43 Hz.

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