Ported or Sealed?? - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 04-06-2008
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Ported or Sealed??

I recently put in a Apline Type E 12 sub with a 1000 wat amp. On my box i have the option of having it ported or sealed. Is there at advantage to haing either or. Is one better for the sub???
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Old 04-06-2008
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I find that a sealed box sounds better in the cab of a pickup. Right now, I have my 12" Kicker L7 in a ported box...and you can actually hear the air blowing out....doesn't sound too good. My 12" Kicker CompVR in a sealed box sounds more "full" or "pure". I suppose that might be the correct word i'm looking for.
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Old 04-06-2008
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it depends on what you want. if you want your subs to just straight up slam then go to an audio shop and get them to build you a really good vented box. if you want clear bass, but it will also hit hard w/those type E's, then a sealed box is what you want. it would prob be better for the 12's with a vented box though.
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Old 04-06-2008
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I just want it to hit nice a solid. so i guess ill leave it sealed...
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Old 04-06-2008
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i had a friend that had two 10" type E's on a 1200 watt Rockford-Fosgate amp. they were crazy, he had them in a sealed box. but if you just want a good solid thump that is pretty clear and accurate, then get a sealed box
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Old 04-06-2008
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Sealed is more for SQ but can get loud. Ported is for SPL and gets very loud!

Rap type music also is better with ported and fast beats like dance is better with sealed
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Old 04-06-2008
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I personally love ported, as long as theres enough port volume so you don't get port noise. I have a 10" L5 in a 2.25ft3 slot ported box and there isn't ANY port noise, so slots seem to be the way to go. I've heard the type E's in sealed and it seems like they love it in sealed boxes. My buddy went from 2 type E's sealed with about 120 watts rms to each one, up to two 12" L5's ported with 800 rms to each and sadly the Apline's hit alot harder. so there's my $0.02
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Old 04-06-2008
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does having it ported or sealed have any affect on the sub? Because i have it sealed right now and when i has been on for a while it will start to make a knocking sound....
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Old 04-06-2008
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Sealed I think sounds far better. With ported you cant feed the sub as much power.
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Old 04-08-2008
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wrongo! i work at a audio shop. you can feed the sub the same power. yes ported usually gets louder then sealed, if you are going to go sealed get this cotton stuff that goes in the box, it makes the air flow slower equaling better sound. but if i were you personaly with the set up you got i would go ported all the way
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Old 04-08-2008
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what kind of music do you generally listen to? if you are looking for a more tight bass go sealed if you just want to just flat out be loud and deep go ported. in your case i say sealed, but personally i like my ported box.
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Old 04-08-2008
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Ported!!ported!!ported!!
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Old 04-08-2008
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i have an infinity kappa perfect 12.1 in both custom built sealed and ported boxes in my 93 F-150 reg. cab. with the ported box the windshield wipers would bounce about an inch of the windshield with only 450w RMS. with the sealed box it isnt nearly as loud but i can definatly hear the better clarity. i didnt have the time or room for a proper slot port so i used PVC with the ends rounded off and it worked ok. i even went as far as making the ports tuneable to taylor the music i wanted to listen to hehe.
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Old 04-08-2008
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Quote:
Originally Posted by Dantheman88125 View Post
Is one better for the sub???
Easiest way to determine is to look at your sub's EBP #. To do so, look at your T/S parameters to see if it's even suitable for a vented box... it'll let you know what your sub recommends. for this you'll need the Fs and Qes of the sub

Alpine Type E 12"

Fs (Free Air Resonance)- 31
Qes(how efficient a speaker is electrically)- .7

EBP (Efficiency Bandwidth Product)= Fs/Qes

so, 31/.7= 44.285... basically a EBP of 44.
-------------------------------------------------------------------------------
Simple Rule of Thumb when looking for the best box for a certain sub:

if the EBP is below 50, a Sealed box would be the only way to go.

if the EBP is 50-75, a Sealed box is reccommended, but, a vented may be pulled off.

if the EBP is 75-100, a Vented is recommended, but, a sealed may be pulled off.

if the EBP is over 100, a Vented would be the only way to go.
------------------------------------------------------------------------------

your EBP is a 44. that is way below the 50 mark. it is not recommended that you use anything other than sealed. there is a reason why Alpine does not give specs on vented box options for this sub. please ignore the guy that works in a shop yelling ported, lol.

and to clarify, just for your information... the "cotton stuff" he is referring to is polyfill. it is used in slightly smaller than recommended sealed enclosures. the polyfill causes the sub to think the box is larger. it is not neccessary if the box is built to full recommended size.

Last edited by Strider0O0; 04-08-2008 at 11:23 PM.
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Old 04-09-2008
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Quote:
Originally Posted by poopypie218 View Post
wrongo! i work at a audio shop. you can feed the sub the same power. yes ported usually gets louder then sealed, if you are going to go sealed get this cotton stuff that goes in the box, it makes the air flow slower equaling better sound. but if i were you personaly with the set up you got i would go ported all the way

Your correct sorry. a sub in a ported box will hit its excursion sooner than a box that is sealed. So would a sealed box not will require more power to equal the same DB as a ported box?
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