sealed vs ported debate. who is right

[snfsh79077 10+ year member]

Ported 5 cubes net, tuned at 30Hz, 72sq^in of port area (6"x12" x 35.75"deep L-port)and your set.

The ported guy is right, in the entire 25-40hz range you should see at least a 4-5db increase.

The box size is your major consideration. If you can fit ported, go for it.

that seems small for 3 cvx 12s....

 

[dman4486 5,000+ posts]

"there are too many variables for that to be relevant in this thread"
its just an example of what typically happens between sealed vs ported. sometimes seeing graphs helps a person to see what goes on.

This is the enclosure's curve, not the in vehicle curve

MY VENTED ENCLOSURE

THE SEALED ENCLOSURE FOR THE SAME APP.

 

[nauc 10+ year member]

lets see...
first off mock up programs have no use due to the fact of cabin gain, imp rise etc

second ported vs sealed is not really a debate on which is "better" each has an application where there are advantages and disadvantages...

BBP does. it has graphs for system impedance, cone displacement, group delay, phase response, vent air velocity, max electric input power, max acoustic power, custom amplitude response etc

 

[Onebadsrt 10+ year member]

Ported 5 cubes net, tuned at 30Hz, 72sq^in of port area (6"x12" x 35.75"deep L-port)and your set.

The ported guy is right, in the entire 25-40hz range you should see at least a 4-5db increase.

The box size is your major consideration. If you can fit ported, go for it.

would this be big enough, kicker says min of 5.25ft sq and max of 7.05ft for 3 subs!

and for those wondering it will be in a srt8 Jeep.

 

[Onebadsrt 10+ year member]

i was thinking maybe 6 ft would work well, but i have no idea of what port size and how to make a box so that its tuned to 30 or 33hz etc. . . i hope they do.

 

[snfsh79077 10+ year member]

would this be big enough, kicker says min of 5.25ft sq and max of 7.05ft for 3 subs!and for those wondering it will be in a srt8 Jeep.

I would go at least 6 cubes for 3 of them. I designed/built an enclosure for a buddy for 2 cvx 12s that was 4.5 cubes at I think 33hz which was still a little small for the subs but they perform great paired with a zx1500.1 or w/e

 

[IDSkoT 5,000+ posts]

one of the things that = sq is having a flat response, meaning every frequency is reproduce at the same volume. thats why ported are usually inferior to sealed when it comes to sq cause they usually have a peak in the frequency response which is why theyre usually louder overall
heres the in car estimated frequency response for JL Audios 12w6v2 in sealed (yellow) and ported (red) in recommended size and tuning boxes

This.

While a properly designed, and tuned box will sound great and get loud, most people don't go through the trouble. They just get a sealed box and say, "ITZ FOR SQ". A ported box can get the same quality as a sealed box (depending on the driver, that is.)

Some drivers (Such as every DD sub ever made) are designed to be in a ported enclosure.

Anyone who sums it up as "Sealed for SQ, Ported is for going loud" is just wrong and ignorant.

An enclosure tuned lower will have a nice low response and a nice even roll off and flat response... A sealed enclosure with have a low response (Low response being that it's loud at lower frequencies.) and have a nice flat roll off response. That's why people associate sealed enclosures with SQ. Because of the over-all flat response given.

However, a ported enclosure can get the same flat response if designed correctly.

There are WAYY too many factors to consider, which is why anyone who says anything definitive is just wrong.

and for what car is that????//content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif
there are too many variables for that to be relevant in this thread

Exactly.

 

[photocrazy8 10+ year member]

BBP does. it has graphs for system impedance, cone displacement, group delay, phase response, vent air velocity, max electric input power, max acoustic power, custom amplitude response etc

but does not account for every little difference from car to car and system to system etc...

 

[Onebadsrt 10+ year member]

i just want a loud system that wont make my jeep sound like a rattling tin can lol

 

[duece212 5,000+ posts]

This.While a properly designed, and tuned box will sound great and get loud, most people don't go through the trouble. They just get a sealed box and say, "ITZ FOR SQ". A ported box can get the same quality as a sealed box (depending on the driver, that is.)

Some drivers (Such as every DD sub ever made) are designed to be in a ported enclosure.

Anyone who sums it up as "Sealed for SQ, Ported is for going loud" is just wrong and ignorant.

An enclosure tuned lower will have a nice low response and a nice even roll off and flat response... A sealed enclosure with have a low response (Low response being that it's loud at lower frequencies.) and have a nice flat roll off response. That's why people associate sealed enclosures with SQ. Because of the over-all flat response given.

However, a ported enclosure can get the same flat response if designed correctly.

There are WAYY too many factors to consider, which is why anyone who says anything definitive is just wrong.

Exactly.

Doesnt group delay play a part in ported setups as far as SQ goes? Also don't large low ported setups sacrifice some upper end response to gain the low end response? I remember reading alot of old style Re xxx users complaining of that with their large low boxes. I had an fi Q 15 in a big box tuned low and I thought it ****** on the upper end.

I would be curious to measure some systems sealed/ported in vehicle and see with cabin gain what the response curve really looks like.

 

[nauc 10+ year member]

but does not account for every little difference from car to car and system to system etc...

no fukin sh!t, i never said if you use the 12w6v2 in one of those boxes, you will get exactly THAT graph out of your car

 

[JimJ 5,000+ posts]

I've never thought a sub's "upper end" is really that much of a concern...ideally, you should have your midbasses be playing confidently low enough where the driver's inductance isn't a concern (as well as avoiding the stage being pulled back due to localizable sound).

 

[Onebadsrt 10+ year member]

no fukin sh!t, i never said if you use the 12w6v2 in one of those boxes, you will get exactly THAT graph out of your car

so with all this debate and the technical parts that you need to know to build a correct ported box, would i be better off just building a 4ft sealed box. since i doubt the shop im goin to has ne computer prog. showing them what dimensions and port sizes they need.

 

[duece212 5,000+ posts]

I've never thought a sub's "upper end" is really that much of a concern...ideally, you should have your midbasses be playing confidently low enough where the driver's inductance isn't a concern (as well as avoiding the stage being pulled back due to localizable sound).

Agreed, but thats alot easier to accomplish in home than in a car, especially when people are running so much sub and very little front stage //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif

I go against the SQ grain, I like my subs playing a little higher than they should in the car. My truck is far from a decent listening environment though.

 

[Upzaw2000]

Ported FTW!

 

[Onebadsrt 10+ year member]

anyone that knows about how to build a certain size box and how to tune with the ports etc wanna design me a box for like $10-20 and then i can just give the shop dimnsions and have them build it!

 

[audioholic 5,000+ posts]

Doesnt group delay play a part in ported setups as far as SQ goes? Also don't large low ported setups sacrifice some upper end response to gain the low end response? I remember reading alot of old style Re xxx users complaining of that with their large low boxes. I had an fi Q 15 in a big box tuned low and I thought it ****** on the upper end.

How large do you consider large? People always said the XXX's needed a large box, and yet they required 4 cubes for a 15 ported, 2 cubes for a 12 ported, 1 cube for a 10 ported, etc. Last I checked, that's right on par with the average enclosure size in car audio these days. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[duece212 5,000+ posts]

How large do you consider large? People always said the XXX's needed a large box, and yet they required 4 cubes for a 15 ported, 2 cubes for a 12 ported, 1 cube for a 10 ported, etc. Last I checked, that's right on par with the average enclosure size in car audio these days. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

Don't remember what people were running their xxx's in, I just remember the complaint. I know 4 cubes at 29hz on my FI q15 didn't please me. As stated above I'm one of those bad guys that likes more upper end response though //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif

 

[fasfocus00 5,000+ posts]

anyone that knows about how to build a certain size box and how to tune with the ports etc wanna design me a box for like $10-20 and then i can just give the shop dimnsions and have them build it!

their are quite a few of us on here that can give you box plans.

if you are after SQ I think that you really need to hear a car with good SQ (near flat response across the board). most ppl hate the way a pure SQ setups sound b/c it doesn't have as much bass. I'd go ported if I were you especially since Kicker isn't that great of a woofer to go with for SQ, IMO. leave SQ to the Home Theatre guys.

whatever little SQ difference that the sealed box would give you would not be enough for you to enjoy your setup.

 

[audioholic 5,000+ posts]

Don't remember what people were running their xxx's in, I just remember the complaint. I know 4 cubes at 29hz on my FI q15 didn't please me. As stated above I'm one of those bad guys that likes more upper end response though //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif

They were running them in 4 - 4.5 cubes per 15 ported. Again, right about average with other, similar subs.
Yes, I remember the complaints too. Doesn't make them right.