vaccum sealed?

[toolfan89 10+ year member]

my friend made up a crazy way to vaccum seal a sub box does anybody think that would actually do any good?

Click to read more...

 

[Crown_amps]

kicker seals their cones that way i dunno about a box it may fu@# with the chaulking beads between the butt joints of the box causing air leaks etc

it may work sure post some pics and vids of you two trying it out

 

[Louisiana_CRX 5,000+ posts]

I'm probally wrong here but I would think that would be nearly impossible to vaccum seal an enclousure....because of how a speaker is made. Most if not all magnet structures are vented...and to get a perfect seal around the mounting ring seems iffy...As far as a good air tight box build...with little air loss ...i've heard it does help low end extension...if completely sealed vaccumed out ...i'd think it wouldn't perform as well because sub couldn't perform once sucked in...

 

[audioholic 5,000+ posts]

Hmmmm.

What an enclosure do for a speaker? It creates an air cushion behind the spekaer to work as a suspension, tuning the overall system and dampening cone motion in the process.

How does this work? It work by air molecules inside the enclosure. When the cone move in, the space inside the enclosure gets smaller (by cone taking up more room), the box is 'sealed' so the air molecules have no where to be displaced, they simply squeeze together tighter (tighter than ambient air prssure outside the enclosure). This compressing effect on the molecules now means there is a high pressure zone on the inside side of the speaker's cone, and a low pressure zone on the outside. This makes the cone naturally want to move back out and equalize pressure on both sides of its cone. Simple physics. When the cone moves out, same thing only in reverse... air molecules expand apart creating low pressure inside the box and high outside, again wanting to cetner the cone back to neutral.

Now, remove the air molecules from the box. Your air spring/cushion has just been removed, enclosure 'tuning' just went right out the window. Due to having low pressure inside the enclosure from ******* a vacuum, as was said above, the cone would simply **** in and never move back out. This would hurt performance, not help it. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

And I agree with above, even if it were a good idea, building an enclosure so sealed it didnt lose its vacuum... would be almost impossible. Even the wood ifself would need to be sealed.

 

[kngadrok 10+ year member]

audioholic

that's a **** good response, because even I understood it.

 

[audioholic 5,000+ posts]

audioholic

that's a **** good response, because even I understood it.

Even with all my typo's? lol Glad you liked it. //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

 

[phantom240 5,000+ posts]

Well... i was just thinking about what you guys are talking about.. and if you were to wire it out of phase, so the cone moves outward instead of inward.... it would be pretty neat... or mount it inverted

 

[audioholic 5,000+ posts]

Well... i was just thinking about what you guys are talking about.. and if you were to wire it out of phase, so the cone moves outward instead of inward.... it would be pretty neat... or mount it inverted

You seem to be a bit confused. The speaker's cone is intended to move in AND out. Now, if someone sucks a vacuum that pulls the cone in permanently (until vacuum is released), how is that so neat? Inverting the speaker or wiring it out of phase wont help, at all.

******* a vacuum inside a speaker box is not only a horrible idea, the speaker would fail to even work anymore. Give it up guys, its just not a feasable idea, nor can anyone even tell me any sort of theory of how this would help... anything. Cuz it wont. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

Might as well discuss ******* a vacuum in your CD player and the performance improvements involved....

 

[smd4life 5,000+ posts]

we need pics of this...if you sucked all the air out of the box, the sub would just **** in it self, it would just bottom out and stay there

 

[Flipx99 5,000+ posts]

But if you could pressurize, then vaccuum seal many times, then it would work. Isn't that what the sub does, or atleast tries to do?

 

[T3mpest 10+ year member]

not really. On the inside of the box the amount of air should stay constant. The volume is what's changing. A sub is trying to create a alternating low and hi air pressure area, but that's far from a vacuum. I'd say most of this is coming from people wanting to correlate the words "sealed" and "vacuum" together.

 

[ramos 5,000+ posts]

FYI Cones aren't airtight themselves . //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[reneeb7363 10+ year member]

//content.invisioncic.com/y282845/emoticons/waycrazy.gif.f4a380c3f94043939fd369defd9e6be2.gif

......someone doesn't quite get the concept of how a sub works WITH an enclosure and in respect to the volume of confined air within said enclosure. This by far has got to be one of the siliest posts to date.

please copy and paste audioholic's post to microsoft word, print it out, then go to the12volt.com and read.... when you think your 'friend' understands...then read some more.

thank you and have a 'vacuum enhanced' day!

 

[PESteele 10+ year member]

since were talking about boxs are there sealed bandpass boxes

 

[smd4life 5,000+ posts]

since were talking about boxs are there sealed bandpass boxes

yes and no, not the total box of course, but in 4th, 8th order bandpass boxes there are chamber inside the box that are sealed