box building
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=116194
Printed Date: May 15, 2024 at 7:51 PM
Topic: box building
Posted By: toledo5189
Subject: box building
Date Posted: September 08, 2009 at 3:34 PM
I am trying to come up with some measurements to house my 12" Kicker CVX. I want to build a ported enclosure but when it comes to port specs I am lost. I don't know how big to build the port or how deep inside the box the port should go. How do I come up with measements for a port size? If anyone has a Kicker CVX and could you please give me some input from peronal setups.
Replies:
Posted By: laynlower
Date Posted: September 08, 2009 at 7:32 PM
dude just go to the kicker web site and download the manual for free. they also have a spot to help you understand how to build a ported box
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Posted By: toledo5189
Date Posted: September 08, 2009 at 8:54 PM
Ok I went to Kicker.com and found some specs and this is what I came up with. Please give some feedback. Again it is for a 12" Kicker CVX.
Posted By: toledo5189
Date Posted: September 08, 2009 at 8:59 PM
Kinda hard to read here are the essentials.
(W) - 25"
(H) - 14"
(D1) - 18"
(D2) - 18"
Box Volume - 2.354
Tuned Frequency - 40.9
Posted By: laynlower
Date Posted: September 08, 2009 at 9:53 PM
that kinda says it all. but will that fit in your car?
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LOWLIFE CUSTOMS
Posted By: toledo5189
Date Posted: September 08, 2009 at 11:08 PM
Yea anything with a relatively low height will fit and this deff will. What about the tuned frequency I don't know much about that but I listen to mostly rap and want deep clean bass, is 40Hz going to do that for me?
Posted By: haemphyst
Date Posted: September 09, 2009 at 12:01 AM
GAH! Perfect for rap. I'd never tune that high, but those woofers are apparently designed to blast your eardrums, not go deep.
That being said, you and I will VERY likely have very different definitions of "deep bass". First of all, rap has very little truly deep bass, if that helps you see where I am coming from.
Make sure you apply a subsonic filter at around 35 to 38Hz, or you'll beat 'em on the stops!
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It all reminds me of something that Moličre once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."
Posted By: toledo5189
Date Posted: September 09, 2009 at 12:40 AM
haemphyst wrote:
GAH! Perfect for rap. I'd never tune that high, but those woofers are apparently designed to blast your eardrums, not go deep.
That being said, you and I will VERY likely have very different definitions of "deep bass". First of all, rap has very little truly deep bass, if that helps you see where I am coming from.
Make sure you apply a subsonic filter at around 35 to 38Hz, or you'll beat 'em on the stops!
Yea I know what you mean. Originally I put one together on this website using different dimensions that was tuned to 33hz. The main difference was the total port length was almost 30" and that seemed like a lot. Also the port was 2.5" wide. From reading up on kickers manual it sounds like I would want a 3" width with a 20.5" length but the tune shoots up to 40hz. Is there a happy medium that you think I would like better?
Posted By: aznboi3644
Date Posted: September 09, 2009 at 2:50 AM
tune to whatever you want
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Custom Enclosure Design
Posted By: drew454u
Date Posted: September 09, 2009 at 4:52 AM
haemphyst wrote:
Make sure you apply a subsonic filter at around 35 to 38Hz, or you'll beat 'em on the stops!
What do you mean by this??
Posted By: toledo5189
Date Posted: September 09, 2009 at 4:46 PM
aznboi3644 wrote:
tune to whatever you want
That was pretty much the reason of my post, to understand more about tuning. I don't know what the difference between 33hz and 40hz is. Obviously ones a lower frequency but by tuning a box to that what is it doing? If a box is tuned at 33hz is that where the sub will perform best in that box?
Posted By: DYohn
Date Posted: September 09, 2009 at 4:57 PM
toledo5189 wrote:
aznboi3644 wrote:
tune to whatever you want
That was pretty much the reason of my post, to understand more about tuning. I don't know what the difference between 33hz and 40hz is. Obviously ones a lower frequency but by tuning a box to that what is it doing? If a box is tuned at 33hz is that where the sub will perform best in that box?
You have to model the specific speaker you want to use in order to see. Download Win ISD or Unibox. ------------- Support the12volt.com
Posted By: laynlower
Date Posted: September 09, 2009 at 4:58 PM
The tune frequancy of the port is where the box/system will have a 3db spike and roll off sharply on both sides. the air inside the port will start to vibrate and increase the output of the system. a ported box will require a lot more power to run because you do not have the suspension of a sealed box therefor you need better control over the voicecoil. ------------- live to scrape
scrape to live
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Posted By: DYohn
Date Posted: September 09, 2009 at 5:17 PM
laynlower wrote:
The tune frequancy of the port is where the box/system will have a 3db spike and roll off sharply on both sides. the air inside the port will start to vibrate and increase the output of the system. a ported box will require a lot more power to run because you do not have the suspension of a sealed box therefor you need better control over the voicecoil.
huh? No, a vented system has higher efficiency than a sealed one and does not roll off sharply on "both sides" of the tuning frequency... and there is no such thing as "control over the voice coil." Vented systems do not require "a lot more power to run." Indeed, a sealed system will consume more power for the same dbSPL output. ------------- Support the12volt.com
Posted By: toledo5189
Date Posted: September 09, 2009 at 5:43 PM
Ok well I tried Win ISD and entered in what I could. There where a couple things that confused me and wasn't sure what to enter. But from what I entered it say my PEAK SPL would be around 185 @38hz. That seems way off but I guess I am just going to go ahead and tune to 33.
Posted By: laynlower
Date Posted: September 09, 2009 at 6:08 PM
for the same spl yes. but you can run a smaller amp on a sealed box with better results than a ported box. the ported system will always be louder but you need to have control over the woofer. a small amp say 100 watts might not be as clean sounding as a big amp. (not as much control) when the woofer needs to change direction.
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live to scrape
scrape to live
LOWLIFE CUSTOMS
Posted By: toledo5189
Date Posted: September 09, 2009 at 6:44 PM
Yea I already have a monoblock amp pushing 1200 watts rms to the sub. I was pushing two 12s before but I got rid of one and I'm not changing the amp, its a nice amp. I just have one last questions before I start cutting my pieces out. Well too long of a total port length kill a box? The one is have measured out will have a total port length of 35.5"
Posted By: laynlower
Date Posted: September 09, 2009 at 6:53 PM
it might not kill the box but it will change the tune of the port.
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live to scrape
scrape to live
LOWLIFE CUSTOMS
Posted By: toledo5189
Date Posted: September 09, 2009 at 6:58 PM
laynlower wrote:
it might not kill the box but it will change the tune of the port.
Ok well i guess I well give this build a try...2.36 cu. ft. tuned to 33.6hz
Posted By: DYohn
Date Posted: September 09, 2009 at 8:46 PM
laynlower wrote:
for the same spl yes. but you can run a smaller amp on a sealed box with better results than a ported box. the ported system will always be louder but you need to have control over the woofer. a small amp say 100 watts might not be as clean sounding as a big amp. (not as much control) when the woofer needs to change direction.
Nope, sorry, that's just wrong. The size of the amp has nothing to do with the "control of the woofer." I assume you're talking about damping factor? While many people (including myself) feel this particular specification is not very important to the way a system sounds, it is very much misunderstood. A vented system will always be more efficient than a selad (acoustic suspension, not IB) system using the same woofer. ------------- Support the12volt.com
Posted By: DYohn
Date Posted: September 09, 2009 at 8:48 PM
toledo5189 wrote:
Yea I already have a monoblock amp pushing 1200 watts rms to the sub. I was pushing two 12s before but I got rid of one and I'm not changing the amp, its a nice amp. I just have one last questions before I start cutting my pieces out. Well too long of a total port length kill a box? The one is have measured out will have a total port length of 35.5"
I have no idea what you mean by "kill a box," but the length (and diameter) of a port only determines the resonant "tuning" frequency. It can be 17 feet long if that's what's required for the system you're building. ------------- Support the12volt.com
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