Hmm Ported or Sealed Box?

mike11202 · 01-04-2007, 09:16 PM

Which type do you guys think I should get? I am looking for SQ and i was thinking about getting a double baffle ported box.

Its going up to an eD NINe.1 amp 450x1 @4ohm 900x1 @2ohm

Its a JBL W12GTi MkII Sub.

http://carsound.com/articles/publish/article_892.shtml

http://www.jbl.com/car/products/prod...at=SUB&ser=GTI

Eltrentz · 01-04-2007, 10:21 PM

Personally i think sealed boxes make the bass sound better

moxom · 01-04-2007, 10:24 PM

A well designed/integrated sub will sound great regardless of the bass alignment.

c0lby68 · 01-04-2007, 10:24 PM

I have had both and much perfer ported much deeper tone

Rommy · 01-04-2007, 10:32 PM

Quote:

Originally Posted by c0lby68

I have had both and much perfer ported much deeper tone

Ported only gives more bass at lower frequencies if you tune the box low; if you tune too high, you will LOSE low-end extension. But if you tune too high, you will lose high-end extension. It's a give-and-take situation. Sealed yields the best flat response, but won't be as loud. I'd say go sealed, if you don't like it or want louder, go ported.

less · 01-04-2007, 11:25 PM

Go sealed... it is the only way to get tight SQ bass. You might try an Image Dynamics IDQ sub in it too... or if you have more bucks to spend - try an ID Max. Used ones can get in the $200 range.

As far as I know, there are very few systems in SQ competitions using ported bass... and that is for a reason.

Good luck!

Jim

Toxis · 01-05-2007, 12:57 AM

Sealed > Ported in quality sound. Rommy pretty much summed it up.

Unless you want to talk about 4th order quasi-bandpass boxes for SQ. MMMMM Sorry!

bikinpunk · 01-05-2007, 02:27 AM

Ported, tuned low. That is all.

lostdaytomorrow · 01-06-2007, 02:54 PM

I prefer ported for SQL.

Streethonda06 · 01-06-2007, 02:55 PM

I have a sealed box and the bass sounds so clean!!!! but it all depenst on how you like your sound

good luck

Toxis · 01-06-2007, 11:49 PM

^and what subs you have.

moxom · 01-07-2007, 07:49 AM

The best thing to do is call JBL and ask them for the T/S (Fs, Qts, and Vas)parameters and report back to us.
Auto sub manufacturers are notorious for advertising that a particular sub is suitable for all types of enclosures; which is usually a lie.
Woofers have a Q (Qts) factor which is a measure of how dampened the woofer is. It's that number that will determine if you need the dampening of a ported box or a sealed box to keep the distortion down and the output linear.
This is why I said that a properly designed ported or sealed box will sound good.
Most folks prefer one over the other because they either a) heard an improperly tuned sub or b) have read misleading information.

***Devin*** · 01-07-2007, 12:30 PM

I've never been able to find information that explains all the T/S parameters. I've seen short definitions for some of the parameters, but never a full explanation. Last summer I took a Syn-Aud-Con seminar titled "Sound Reinforcement For Designers" in which the instructor, Pat Brown, defined "Q" as being a directivity factor relating to the Directivity Index of a driver. Maybe someone could break it all down, or as Pat would say, lets peel some onions.

Toxis · 01-07-2007, 03:31 PM

Loudspeaker Cook Book by Lance Dickenson... or was it Vance? GREAT book!!!

moxom · 01-07-2007, 03:38 PM

Well let me do some peeling for ya':
In driver (the actual speaker) and system design (driver and enclosure) you have to take into account key enclosure and driver parameters to help predict and determine the box size, tuning frequency and F3.
The big three driver parameters are Qts., Vas and Fs.
Qts. is the driver's total dampening and is comprised of the electrical dampening (Qes) and mechanical dampening (Qms). The primary restoring force(spider), voice coil, magnetic flux, etc. will determine what the Qes and Qms will be.
The Vas is the amount of air it would take to equal the stiffness of the driver's suspension.
Fs is the resonant frequency of the driver when not enclosed.

Hope that helps.

moxom · 01-07-2007, 03:43 PM

That's why in this particular situation a properly designed box is more important than the box type.
It doesn't take much work to build the wrong type of enclosure...

PS: The only woofer line that I know of that can actually be used in any type of enclosure is the Infinity VQ line. You can actually change the driver's Qts. by replacing the metallic slugs near the pole piece.

***SiViC81*** · 01-07-2007, 03:52 PM

If you are after SQ only, then a sealed box is the way to go...Right now I have a ported box and will switch over to a sealed box b/c I'm not happy with the SQ of the ported box...I've had both sealed and ported boxes and sealed boxex always have sounded better...Although a ported box will give you more bass, you compromise SQ and IMO it's not worth it for the extra bass...

moxom · 01-07-2007, 04:00 PM

Quote:

Originally Posted by SiViC81

If you are after SQ only, then a sealed box is the way to go...Right now I have a ported box and will switch over to a sealed box b/c I'm not happy with the SQ of the ported box...I've had both sealed and ported boxes and sealed boxex always have sounded better...Although a ported box will give you more bass, you compromise SQ and IMO it's not worth it for the extra bass...

That's your opinion...but it's flat out wrong.

What makes a closed box better than a ported box?

I have been building speakers that use both types of bass loading for about 20 years. I have built some that sound good and bad but I've never blamed it on the bass loading technique because I know better.

***SiViC81*** · 01-07-2007, 04:14 PM

Quote:

Originally Posted by moxom

That's your opinion...but it's flat out wrong.

What makes a closed box better than a ported box?

I have been building speakers that use both types of bass loading for about 20 years. I have built some that sound good and bad but I've never blamed it on the bass loading technique because I know better.

Well it's just my opinion...like I said, I have had both types of boxes and I prefer sealed b/c the bass is tighter and overall SQ is better, which is why I want to switch back to a sealed box...

yankeesbat17 · 01-07-2007, 04:23 PM

ok heres the thing...

ported = more bass and much louder

sealed= better quality

i would go with ported because if you have a good quality sub it will even it out loudness and good quality

and if ur looking at jbl i would rather go with polk audio...http://www.polkaudio.com/caraudio/products/sr124svc/i find it alot better trust me ive heard everything

01-04-2007, 09:16 PM	#1 (permalink)
mike11202 Senior Member Join Date: Nov 2006 Location: Delaware Posts: 397 Mike iTrader: 0 / 0%	Hmm Ported or Sealed Box? Which type do you guys think I should get? I am looking for SQ and i was thinking about getting a double baffle ported box. Its going up to an eD NINe.1 amp 450x1 @4ohm 900x1 @2ohm Its a JBL W12GTi MkII Sub. http://carsound.com/articles/publish/article_892.shtml http://www.jbl.com/car/products/prod...at=SUB&ser=GTI

01-07-2007, 03:43 PM	#16 (permalink)
moxom Senior Member Join Date: Feb 2006 Posts: 959 iTrader: 0 / 0%	That's why in this particular situation a properly designed box is more important than the box type. It doesn't take much work to build the wrong type of enclosure... PS: The only woofer line that I know of that can actually be used in any type of enclosure is the Infinity VQ line. You can actually change the driver's Qts. by replacing the metallic slugs near the pole piece. Last edited by moxom; 01-07-2007 at 03:48 PM.

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01-04-2007, 10:21 PM	#2 (permalink)
Eltrentz Senior Member Join Date: Dec 2006 Location: Lyndhurst, New Jersey Age: 20 Posts: 481 Lou iTrader: 1 / 100%	Personally i think sealed boxes make the bass sound better

01-04-2007, 10:24 PM	#3 (permalink)
moxom Senior Member Join Date: Feb 2006 Posts: 959 iTrader: 0 / 0%	A well designed/integrated sub will sound great regardless of the bass alignment.

01-04-2007, 10:24 PM	#4 (permalink)
c0lby68 Member Join Date: Dec 2006 Posts: 79 iTrader: 0 / 0%	I have had both and much perfer ported much deeper tone

01-04-2007, 11:25 PM	#6 (permalink)
less Member Join Date: Jul 2006 Posts: 79 iTrader: 0 / 0%	Go sealed... it is the only way to get tight SQ bass. You might try an Image Dynamics IDQ sub in it too... or if you have more bucks to spend - try an ID Max. Used ones can get in the $200 range. As far as I know, there are very few systems in SQ competitions using ported bass... and that is for a reason. Good luck! Jim

01-05-2007, 12:57 AM	#7 (permalink)
Toxis Senior Member Join Date: Sep 2006 Location: Italy Of Course! Age: 28 Posts: 3,799 Even Women Aren't Safe iTrader: 10 / 100%	Sealed > Ported in quality sound. Rommy pretty much summed it up. Unless you want to talk about 4th order quasi-bandpass boxes for SQ. MMMMM Sorry!

01-05-2007, 02:27 AM	#8 (permalink)
bikinpunk Senior Member Join Date: May 2006 Age: 26 Posts: 3,070 Erin iTrader: 3 / 100%	Ported, tuned low. That is all.

01-06-2007, 02:54 PM	#9 (permalink)
lostdaytomorrow Senior Member Join Date: Oct 2006 Posts: 729 iTrader: 0 / 0%	I prefer ported for SQL.

01-06-2007, 02:55 PM	#10 (permalink)
Streethonda06 Senior Member Join Date: Mar 2006 Location: Aurora, IL Posts: 845 Greg iTrader: 1 / 100%	I have a sealed box and the bass sounds so clean!!!! but it all depenst on how you like your sound good luck

01-06-2007, 11:49 PM	#11 (permalink)
Toxis Senior Member Join Date: Sep 2006 Location: Italy Of Course! Age: 28 Posts: 3,799 Even Women Aren't Safe iTrader: 10 / 100%	^and what subs you have.

01-07-2007, 07:49 AM	#12 (permalink)
moxom Senior Member Join Date: Feb 2006 Posts: 959 iTrader: 0 / 0%	The best thing to do is call JBL and ask them for the T/S (Fs, Qts, and Vas)parameters and report back to us. Auto sub manufacturers are notorious for advertising that a particular sub is suitable for all types of enclosures; which is usually a lie. Woofers have a Q (Qts) factor which is a measure of how dampened the woofer is. It's that number that will determine if you need the dampening of a ported box or a sealed box to keep the distortion down and the output linear. This is why I said that a properly designed ported or sealed box will sound good. Most folks prefer one over the other because they either a) heard an improperly tuned sub or b) have read misleading information.

01-07-2007, 12:30 PM	#13 (permalink)
*Devin* VIP Member Join Date: Sep 2006 Location: Deltona Age: 21 Posts: 108 Devin Flannery iTrader: 0 / 0%	I've never been able to find information that explains all the T/S parameters. I've seen short definitions for some of the parameters, but never a full explanation. Last summer I took a Syn-Aud-Con seminar titled "Sound Reinforcement For Designers" in which the instructor, Pat Brown, defined "Q" as being a directivity factor relating to the Directivity Index of a driver. Maybe someone could break it all down, or as Pat would say, lets peel some onions.

01-07-2007, 03:31 PM	#14 (permalink)
Toxis Senior Member Join Date: Sep 2006 Location: Italy Of Course! Age: 28 Posts: 3,799 Even Women Aren't Safe iTrader: 10 / 100%	Loudspeaker Cook Book by Lance Dickenson... or was it Vance? GREAT book!!!

01-07-2007, 03:38 PM	#15 (permalink)
moxom Senior Member Join Date: Feb 2006 Posts: 959 iTrader: 0 / 0%	Well let me do some peeling for ya': In driver (the actual speaker) and system design (driver and enclosure) you have to take into account key enclosure and driver parameters to help predict and determine the box size, tuning frequency and F3. The big three driver parameters are Qts., Vas and Fs. Qts. is the driver's total dampening and is comprised of the electrical dampening (Qes) and mechanical dampening (Qms). The primary restoring force(spider), voice coil, magnetic flux, etc. will determine what the Qes and Qms will be. The Vas is the amount of air it would take to equal the stiffness of the driver's suspension. Fs is the resonant frequency of the driver when not enclosed. Hope that helps.

01-07-2007, 03:52 PM	#17 (permalink)
*SiViC81* Smiley Whore Join Date: Dec 2005 Location: Doity Joizy Age: 27 Posts: 13,268 Shu iTrader: 0 / 0%	If you are after SQ only, then a sealed box is the way to go...Right now I have a ported box and will switch over to a sealed box b/c I'm not happy with the SQ of the ported box...I've had both sealed and ported boxes and sealed boxex always have sounded better...Although a ported box will give you more bass, you compromise SQ and IMO it's not worth it for the extra bass...

01-07-2007, 04:23 PM	#20 (permalink)
yankeesbat17 Senior Member Join Date: Sep 2006 Location: Boca raton, Fl Posts: 122 Evan iTrader: 0 / 0%	ok heres the thing... ported = more bass and much louder sealed= better quality i would go with ported because if you have a good quality sub it will even it out loudness and good quality and if ur looking at jbl i would rather go with polk audio...http://www.polkaudio.com/caraudio/products/sr124svc/i find it alot better trust me ive heard everything