tuning a vented box
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=75657
Printed Date: October 31, 2025 at 1:44 PM
Topic: tuning a vented box
Posted By: 05colorado
Subject: tuning a vented box
Date Posted: April 04, 2006 at 4:00 AM
a box for 2 15's is 35hz a suitable frequency ------------- chrome...its whats for dinner
Replies:
Posted By: DYohn
Date Posted: April 04, 2006 at 11:28 AM
The correct port frequency depends on the speakers you use. What are they? ------------- Support the12volt.com
Posted By: 05colorado
Date Posted: April 04, 2006 at 12:10 PM
rockford fosgate HX2 15's (RFD1215) RF reccomends the tuning frequency be 35hz ------------- chrome...its whats for dinner
Posted By: boardinbum
Date Posted: April 04, 2006 at 12:42 PM
How big do you plan on making your box? You'll probably want to tune it lower for those subs.
Posted By: DYohn
Date Posted: April 04, 2006 at 12:42 PM
OK.... so if RF says 35 Hz, then that is probably good, huh? I believe they also recomend 2.5cuft per speaker, right? So do that and you will be right in line with the manufacturer's recommendations. That's why user's manuals exist. ------------- Support the12volt.com
Posted By: 05colorado
Date Posted: April 04, 2006 at 1:01 PM
DYohn] wrote:
K.... so if RF says 35 Hz, then that is probably good, huh? I believe they also recomend 2.5cuft per speaker, right? So do that and you will be right in line with the manufacturer's recommendations. That's why user's manuals exist.
everytime i look at their info i always think: that dosent look right from air space to port size and length. ive even been asking their 1 on 1 tech question thing. i gave them my dimensions & they said with a box this size: 50"w x 17"h x 15"d (external dimensions) and 2 RFD1215 15's they reccomended 2 6" x 18"L port thats to 35hz i have the box cut out now, no ports are cut yet so i gotta figure this out ------------- chrome...its whats for dinner
Posted By: DYohn
Date Posted: April 04, 2006 at 1:49 PM
Assuming you use 3/4" MDF and accounting for about .5cu ft driver displacement, I get 2X 6" round ports @ 18.25" long = 35Hz tuning. Why are you questioning the manufacturer? If that's what they say is correct, go for it. ------------- Support the12volt.com
Posted By: 05colorado
Date Posted: April 04, 2006 at 2:04 PM
DYohn] wrote:
ssuming you use 3/4" MDF and accounting for about .5cu ft driver displacement, I get 2X 6" round ports @ 18.25" long = 35Hz tuning. Why are you questioning the manufacturer? If that's what they say is correct, go for it.
i dont mean 2 be a pain, i'm just paranoid. this is the 1st vented box ive ever built. i'm used to sealed enclosures can i get 6" plumbing tube from home depot ------------- chrome...its whats for dinner
Posted By: stevdart
Date Posted: April 04, 2006 at 10:30 PM
Take the extra steps to be sure of yourself. Model it in a box-building program. Read my guide on using WinISD in the stickies. Otherwise, you'll just remain in doubt. ------------- Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
Posted By: 05colorado
Date Posted: April 05, 2006 at 12:11 AM
i'm using bass box pro and it says the same thing, I just cant get over the 6" port size. is there an alternative?
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chrome...its whats for dinner
Posted By: stevdart
Date Posted: April 05, 2006 at 8:07 AM
Use a smaller diameter port, which will result in a shorter length. Check the port noise chart to make sure you don't make the opening too small for the port noise factor.
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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
Posted By: 05colorado
Date Posted: April 05, 2006 at 3:20 PM
and where can i find this port noise chart?
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chrome...its whats for dinner
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