Sound Quality: The Sealed/Ported misconception

[Diplexers 10+ year member]

The "Energizer" thread; it keeps going.. and going.. and going....

 

[Diplexers 10+ year member]

Whoa, back to the topic. Your wrong, cover your nose and keep humming and see if its the same.Sealed boxes stop the cone short for more, -punch- ported allow more cone vibration in the 40-60Hz range for more -wave-.

That Eric Estrada pic wins top prize.

WTF? SQ has to do with the bass response over a broader spectrum. You will not get a resonant response as high from a ported box that you will from a sealed. And SQ issues are more applicable to competition you idiot. No shit ported boxes will sound good to the everyday driver but we all know with the exception of you that sealed enclosure's sound better for a smoother response over a broader frequency range than a ported will. And the "Oscar" for biggest idiot on the planet goes to.............BELOW 30!

 

[DBfan187 5,000+ posts]

To Below 30:

 

[nweibley 10+ year member]

Good God, this thread is HUGE.

I can't figure out why this is still even up for discussion, it is pretty clear now... lol

 

[DBfan187 5,000+ posts]

To Below 30:

 

[SkaMan]

Does anyone know where I can get a good sub for $100?

 

[Below 30 10+ year member]

Venting measurments/results. 15 cubic internal, 3/4" mdf, dual 15" drivers (Tumult). Rear board has a total of 17" by 2.5" vent. It is just a Vent, no tube/board into the box. Actual design of vent is; 10" by 3" in center of box, two 2" holes on left side and two 2" holes on right side.

External box size is in earlier post, result for the design is, lowest useable frequency down to 14Hz.

I believe that ported boxes may be less SQ relative to non-intrusion vented, because as the main rival mentioned, it may cause back pressure, since the air must be routed to the specific port opening. Another problem is the common front port design. The speaker pushes the air back naturally, then the air has to travel through the port and go foward, which would be the lag and extra pressure build.

If people built 2 boxes, one with manufacterer style port specs, then one as I have done with just the cut-out at the back of box, there will be a big difference. I see now its because I was so use to my style of venting rear wave, I wasn't realizing industry standard porting will yield different (restrictive) results. Which is why I couldn't understand all this "Ported is for SPL and not SQ".

Anybody with time and extra board, should try the two air-escape methods and see if you don't notice a difference. The measurements I gave for my enclosure and total vent-escape area, probably has a mathematical equation you can use to figure the total vent-escape you can use, if your enclosure is smaller.

Don't just talk about it, try it, get the real-world facts, then come back with the findings.

 

[iceteebone 5,000+ posts]

To Below 30:

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[jlaine 10+ year member]

Whoa, back to the topic. Your wrong, cover your nose and keep humming and see if its the same.Sealed boxes stop the cone short for more, -punch- ported allow more cone vibration in the 40-60Hz range for more -wave-.

That Eric Estrada pic wins top prize.

Below Intelligence (I mean 30... yeah)

I'd like for you to find one documented, provable, scientific source supporting this completely idiotic claim.

Just one, that can be traced back to a scientific analysis and is completely documented proving this bogus crap you continue to spew. YOU CAN'T.

Come on... Just one... I can come up with dozens to the contrary, so you find me one supporting your juvenlie lack of understanding of acoustics.

You truly have no clue what the hell you are talking about, and that is a purely sad situation. Any idiot can sit at home and pretend they are the true basis for knowledge, it takes actual effort to get off your *** and prove it.

So, either support your claims with independant third party information, or come out of your little hole in canada and meet me at a show, and I'll show you how audio *really* works.

You are walking proof that any fool can buy good products (XBL^2 enabled tumult which I'm glad I didn't have the disgrace of selling to you, as I'd be ashamed of myself right now for giving such a good product to such a clueless individual), but still not know squat about what they are doing with it.

 

[kappa546 10+ year member]

hmm........... im too high to figure out how to paste pic... just click on link...... someone please close this post somehow

 

[buchi 10+ year member]

veeeery nice and educational discussion. but i must say that the type of enclosure that one should decide on should be weighted on what type of music one listens too. im a sealed enclosure buff. i love the way my bass sound from my two ppi 12in subs; soft but extended.

but i must also agree with what below 30 was saying about the real intended sound of a particular music or song. it all boils down on how the music was recorded. like subwoofer and amp brands, each has its own unique if not distinct characteristics. each and every record company records their music differently using only the power of the subjective ears of their sound engineers to decide whether the sound recorded is good or not. but we're not there to decide with them and thats why we are left with a few devices to correct it like crossovers and equalizers to tune and recreate the given sound to whats near perfection to us. but still we are enslaved with the given sound we bought from over the record bar counter.

its really a no-contest with regards to with whats the best speaker enclosure. whether its ported, sealed or bandpass, it all depends on the individual listeners taste and opinion. there is no perfect bax for everyone....just choices and preferences.

 

[davidfre21 5,000+ posts]

u accualy read all that shit?

 

[ghs_wrestler189 10+ year member]

I gave up on this thread when Below 30's stupid a s s started yammering.

 

[avistar23 10+ year member]

StAtS on this thred.

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-Mike

 

[audioholic 5,000+ posts]

While your theory holds merit on paper, in the real world its not exactly true. It is true a sealed enclosure is an air cushion, affecting cone movement. This does affect a cones ability to reproduce specific frequencies, the cone still moves so many times per second (to produce the wave).

What you need to consider with a sealed enclosure is, its always wanting to return the cone to its center position, due to changes in air pressure. Certainly this is a 'restriction' on cone movement, but you only see this as hurting the speaker's performance, that's not true. For example, remove a speaker from its sealed enclosure and run it free air (true free air, no baffle or anything) and let us know how well the cone control works out. =P

Vnted, or ported enclosures also put restriction on the cone movement, surely you didnt think otherwise? Its true a ported enclosure has a hole in it to dissi[ate the pressure changes, but it certainly doesn't do it instantly. The cone pushes and pulls that air through those ports, the cone is not free to move without restriction.

Now, if you want to talk SQ, you need to keep in mind its all theory. Anyone have a meter that measures 'SQ'? //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif So lets look at a vented snclosure for a second, see how one is constructed. A vented enclosure is 'tuned' to a specific frequency. Right there that should tell you a vented enclosure will not have a linear output along its entire frequency range, which is inheritantly parallel to 'accurately' reproducing sound. In other words, there is no perfect enclosure.

But, and this is a big but, you have to figure in more than just the speaker/enclosure to determine overall SQ, right? Of course, what it sounds like inside the vehicle affects overall SQ. What Im getting at is, a car has a resonant frequency, each car is different. This mean, the size and shape of the vehicle, and even the materials its made of, can affect how it affects the sound inside the car. It can 'absorb' some frequencies and 'amplify' others. Your linear response on paper from that perfect speaker/enclosure goes right out the window. True SQ competitors know this, and factor it into building/tweaking their systems. If your car resonates at 50hz for example, you aren't going to get good SQ from a ported enclosure turned to or close to 50hz. For example, if a person were to find their car absorbs sound around 30hz, a savvy competitor could/would build a box tuned to that freq to adjust, then smooth it out with an eq.

Now, back to a sealed enclosure. The reason sealed is generally considered best for SQ is because its restrictions on the cone (and freq response) are linear. It doesn't amplify any specific frequencies, because there is nothing to 'tune' when building it. Its output is pretty much linear across its entire frequency range. But, as Ive said above, making a blanket statement like sealed enclosures always do better for SQ is misleading. But, saying a ported enclosure is better is just as misguided (and moreso imho).

If you want to have a serious debate about SQ, you cant stop at the enclosure and speaker. Subs dont play in a vacuum (although they do draw a bit of one in a sealed enclosure =P).