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sealed vs ported

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=113196
Printed Date: May 14, 2024 at 7:06 AM


Topic: sealed vs ported

Posted By: ca$ino
Subject: sealed vs ported
Date Posted: April 16, 2009 at 1:14 PM

Y'all..

Looking for opinions i guess...

When is the appropriate time to port a box vs sealed?

I've made a couple mdf boxes in the past they were always sealed... always sound great... i made 1 ported box (didn't know i needed specific measurements at the time) and it sounded good too. SO i guess what i'm wondering is when should a box be ported? When not? i've always thought a box should be ported for BIG speakers like 15"s and up...

Can someone tell me what the actually difference is also?

I want to know once and for all..

Thanks guys..posted_image

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Look twice, think thrice, 1 splice/ 1 slice!
This is a phrase i came up with and something i will now live by.



Replies:

Posted By: DYohn
Date Posted: April 16, 2009 at 1:55 PM

ca$ino wrote:

When is the appropriate time to port a box vs sealed?

The appropriate time is when it is the appropriate enclosure type for the speaker being used.  Research Efficiency Bandwidth Product.  https://www.ajdesigner.com/phpsubwooferclosed/efficiency_bandwidth_product_equation.php



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Posted By: haemphyst
Date Posted: April 16, 2009 at 1:58 PM
The alignment of the system is ALWAYS decided by the desired response. Some drivers will not perform adequately in one type of enclosure, or one box might be to large or too small to be tuned practically, so in that case the necessary enclosure SHOULD be chosen: sealed vs. vented. The necessary enclosure is dictated by the parameters of the driver.

Short answer: There is rarely a hard coded right or wrong answer.

BTW, I like the sig... posted_image I also like "You can cut it off twice, but it'll STILL be too short!"

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It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."



Posted By: ca$ino
Date Posted: April 16, 2009 at 3:09 PM
Thanks fellas... will look at link when i've got some more time on my hands...

That's what i thought Spiz, that there was to concrete answer....

lol, hey i live by that sig...posted_image posted_image

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Look twice, think thrice, 1 splice/ 1 slice!
This is a phrase i came up with and something i will now live by.



Posted By: ca$ino
Date Posted: April 16, 2009 at 3:16 PM
Okay..just had a chance to take a quick look at that link.. and i'm confused..

it just seems that the output/frequency ratio is slightly prefer (i'm assuming) in a ported box faster that a sealed one.

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Look twice, think thrice, 1 splice/ 1 slice!
This is a phrase i came up with and something i will now live by.



Posted By: DYohn
Date Posted: April 17, 2009 at 10:50 AM

ca$ino wrote:
Okay..just had a chance to take a quick look at that link.. and i'm confused..

it just seems that the output/frequency ratio is slightly prefer (i'm assuming) in a ported box faster that a sealed one.

Yes, you do seem confused.  :)  What exactly are you trying to say?  There is nothing about anything being "faster" in the material I linked you to.



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Posted By: daddmik
Date Posted: April 19, 2009 at 7:43 PM

Good argument but the bottom line in how do you want your low end sounding?  If you want a tight bass sealed, if you want boomie ported is this the answer your looking for.  Of course all subs have different sounds for different boxes so it could come down to space also.

hopes this helps



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DTTS



Posted By: aznboi3644
Date Posted: April 19, 2009 at 10:07 PM
daddmik wrote:

Good argument but the bottom line in how do you want your low end sounding? If you want a tight bass sealed, if you want boomie ported is this the answer your looking for. Of course all subs have different sounds for different boxes so it could come down to space also.

hopes this helps



Bottom line...your "bottom line" statement about sealed and ported is incorrect.

How an enclosure sounds depends on the design and loading environment.

Sealed enclosures can sound boomy and sloppy. Ported enclosures can sound better and "tighter" as you say than sealed. It is all about the design.

Your statement seems to come from a lot of noobs who only know of prefab crap ported enclosures that are made to be boomy and sound like crap by the nature of the small volume and high tuning.

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Custom Enclosure Design



Posted By: ca$ino
Date Posted: April 20, 2009 at 11:46 AM
DYohn] wrote:

ca$ino wrote:

When is the appropriate time to port a box vs sealed?

The appropriate time is when it is the appropriate enclosure type for the speaker being used.  Research Efficiency Bandwidth Product.  https://www.ajdesigner.com/phpsubwooferclosed/efficiency_bandwidth_product_equation.php



in the diagram looks like the ported box gains decibels faster..

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Look twice, think thrice, 1 splice/ 1 slice!
This is a phrase i came up with and something i will now live by.



Posted By: DYohn
Date Posted: April 20, 2009 at 11:58 AM
ca$ino wrote:
DYohn] wrote:

ca$ino wrote:

When is the appropriate time to port a box vs sealed?

The appropriate time is when it is the appropriate enclosure type for the speaker being used.  Research Efficiency Bandwidth Product.  https://www.ajdesigner.com/phpsubwooferclosed/efficiency_bandwidth_product_equation.php



in the diagram looks like the ported box gains decibels faster..

Huh?



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Posted By: ca$ino
Date Posted: April 21, 2009 at 6:59 AM
lol..click on the link, the one you sent... and you'll the comparison graph or the sealed vs ported.

Which do you think sounds better though..ported or sealed? Do you prefer one over the other on specific occasions?

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Look twice, think thrice, 1 splice/ 1 slice!
This is a phrase i came up with and something i will now live by.



Posted By: DYohn
Date Posted: April 21, 2009 at 8:32 AM

Use a sealed enclosure if the EBP of the loudspeaker is 50 or less.  Use a vented enclosure if it is 90 or greater.  If it is between 50 and 90 it can be used in either alignment but should be modeled to determine what works best.

In general (and this is not always true) a ported enclosure is more efficient and can generate higher peak dbSPL than sealed with the same driver, but will be larger and less accurate and produce more distortion than sealed.



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Posted By: daddmik
Date Posted: April 23, 2009 at 8:02 AM
let me first say That I stand corrected by aznboi3644.  In the area I live in I dont get a chance to hear a well tuned ported or slotted box.  As far as the information I came by and hearing some other over the counter ported boxes  it would seem to me from what i hear is ported and slotted and bandpass boxes are boomie.  and sealed are tighter sounding, now it could be just the speakers that I have used in the past.  Ex kicker  comps in the same box sounded a litter boomier than the current mb quart subs that i currently have in a purchased over the counter box.  When In fact I begin to make my own enclousers I can test this further.  But thank You for correcting me.  Peace out.

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DTTS



Posted By: daddmik
Date Posted: April 23, 2009 at 8:11 AM
dyohn my brother i like the way you think ported are more efficent and can generate higher spl no doubt.  but I like the more accurate sound of the sealed enclouser,  If you want high spl and dont mind the boomie sound thats cool but i like my bass tight.  Peace Out.

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DTTS



Posted By: aznboi3644
Date Posted: April 23, 2009 at 4:14 PM
all prefab bandpass enclosures sound like crap...bandpass enclosures are VERY picky in the chamber volumes and tuning. Prefab bandpasses are to small and tuned 50Hz or higher...mucho crapo.

Its not just the subwoofers you use that you hear the boominess...its the enclosures. If you want a good enclosure design PM me. Then you'll fall in love with ported.

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Custom Enclosure Design


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