enclosure porting
Printed From: the12volt.com
Forum Name: General Discussion
Forum Discription: General Mobile Electronics Questions and Answers
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=15845
Printed Date: August 28, 2025 at 9:22 AM
Topic: enclosure porting
Posted By: bigunner1
Subject: enclosure porting
Date Posted: July 03, 2003 at 8:58 PM
nobody in the car audio forums seems to want to help me, i need to know if instead of using a 3" by 9.75" long port like my sub specs say too, if i can use two 1.5" by 9.75" ports instead. will this still give me the same results? the reason i want to know is that my box won't allow me to use the 3" port, which is 3.5" OD any help would be greatly appreciated thanx.
Replies:
Posted By: Velocity Motors
Date Posted: July 03, 2003 at 9:06 PM
Should not make a big difference audibly with two ports and 1/2 the diameter.
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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
Posted By: bigunner1
Date Posted: July 03, 2003 at 9:52 PM
so would it be the same with two 3" ports half the length?
Posted By: Velocity Motors
Date Posted: July 04, 2003 at 5:33 AM
Yes, half the diameter & half the length.
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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
Posted By: bigunner1
Date Posted: July 04, 2003 at 9:55 AM
thanx, that helps alot, when it comes to wiring and installing, i'm a genius, but when it comes to all the technicalstuff with boxes,porting,Qs,Fe, andthe rest of it, i'm not as smart as i think lol. thanx again
Posted By: fakepete
Date Posted: July 06, 2003 at 3:33 PM
I disagree. Port length is dependent on area, not diameter. Two 1.5" diameter ports only have a combined area of 3.53 square inches while a 3" port has an area of 7.07 square inches. To keep the tuning frequency the same the 1.5" ports would need to be a little less than 5" in length instead of 9.75".
Posted By: bigunner1
Date Posted: July 06, 2003 at 6:23 PM
but if were to use two ports, 1.5" dia. that were 9.75" long your saying its not the same as one 3" dia. and 9.75"long?
Posted By: fakepete
Date Posted: July 06, 2003 at 8:22 PM
bigunner1 wrote:
but if were to use two ports, 1.5" dia. that were 9.75" long your saying its not the same as one 3" dia. and 9.75"long?
Yes, thats what I'm saying. If you want to use two 1.5" ports they only need to be 4 7/8" long.
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