Air space for Eclipses?

[kronos98]

I have 2 12" DVC Aluminum Eclipses (SW8122DVC). The specs say Vas = 3.2 cu ft. I'm assuming that means "vented air space?"

But also, in the information for the speaker on the Eclipse website, it says the subs are for "Small Sealed-Box Enclosure " ??

Does anyone know how much airspace I need for these speakers?

[ZXLNT]

The VAS is the equivalent amount of air space that has the same compliance as the speakers suspension. Does the eclipse sight not give any box specs????



Hmm I guess not. Try a program called WINSD its a subwoofer box design program... Or get on sounddomain.com in the subwoofer forum and ask. Seems like the Eclipse subs are fairly popular...

[kronos98]

so VAS means "volume of air equal to the mass of the speaker"

if the specs say VAS: 3.2 cu ft.......I need 3.2 cu ft per sub?? that's insane!

[Jackass-Jeff]

so VAS means "volume of air equal to the mass of the speaker"

if the specs say VAS: 3.2 cu ft.......I need 3.2 cu ft per sub?? that's insane!

yup. =P You're gonna love how they sound It's gonna be a pretty damn big box... my friend has 2 Aluminum DVC 12s and the box fills a good chunk of his crappy ass trunk =P (chevy mailbu... 01) lol

[i20solara02i]

so VAS means "volume of air equal to the mass of the speaker"

if the specs say VAS: 3.2 cu ft.......I need 3.2 cu ft per sub?? that's insane!

yup. =P You're gonna love how they sound It's gonna be a pretty damn big box... my friend has 2 Aluminum DVC 12s and the box fills a good chunk of his crappy butt trunk =P (chevy mailbu... 01) lol

haha ya which those sub where mines but then move on to something bigger

[ZXLNT]

so VAS means "volume of air equal to the mass of the speaker"

if the specs say VAS: 3.2 cu ft.......I need 3.2 cu ft per sub?? that's insane!

No thats not how it works. Let me see if I can find my loudspeaker design cookbook I have laying around. You have to figure in many factors. All the Thielle Small Parameter. I am guessing around 1.5 cubic feet or so. It depends on low you want the box tuned.. Give me a bit and I'll come up with something for you...

[Jackass-Jeff]

i forgot to mention, he's running a ported box. not sealed...

[pro956]

"Vas Volume of air equal to the driver compliance.

This can be thought of as how stiff the movement of the cone is. The value is given in litres or cu inches. There are a lot of variables that determine the Vas, so you can’t really say that high values of Vas mean a certain thing or are better. A single or double suspension spider will affect Vas, so does the size of the cone. The temperature of the air and also the humidity will affect Vas and so it is one of the hardest parameters to evaluate.
"

vas give suspension compliance not the perfect enclosure.

go with about 3.5cubes after displacement for the whole box (not each sub)

31.17 hz 4" port diameter
6" length

call up ecplise and double check
their number should be somewhere on their site

[kronos98]

dang. i'm still lost. so how big is the box supposed to be? haha

[WortownSolara]

ok believe it or not, and im sure yall wont, but the aluminums and titaniums happen to be our best selling subs. we go for .88 cubic feet. If you go any larger without venting, there is quite the possibility of cone noise. But thee 88 still allows it to slam pretty low, and loud at that too.

[Jackass-Jeff]

ok believe it or not, and im sure yall wont, but the aluminums and titaniums happen to be our best selling subs. we go for .88 cubic feet. If you go any larger without venting, there is quite the possibility of cone noise. But thee 88 still allows it to slam pretty low, and loud at that too.

expensive blood you guys have in mass. x_x rich area?

[ZXLNT]

dang. i'm still lost. so how big is the box supposed to be? haha

3.5 total cubic feet, AFTER allowing for the amount of air displacement the speakers and the ports and ANY internal bracing takes up. So the actuall internal airspace will be BIGGER than 3.5 cubic feet but after you get the speakers and ports installed whats left should be 3.5 cubic feet...

[kronos98]

so if i have 2 12" dvc aluminum eclipses...the total enclosure space is going to be larger than 6.4 cf for a sealed box? isn't that basically all the usable trunk space that we have???

[ZXLNT]

so if i have 2 12" dvc aluminum eclipses...the total enclosure space is going to be larger than 6.4 cf for a sealed box? isn't that basically all the usable trunk space that we have???

3.5 cubic total for both subs, not each sub. That will fit in the trunk easily.. Again you will need to figure how much air each subwoofer displaces, the amount of air the port displaces and how much air any bracing will displace. After you have that figure then you have to determine how big the box needs to be to have an interior airspace of 3.5 cubic feet total. If you subs and ports and bracing use up .5 cubic feet then your box actually needs to be 4.00 cubic feet in airspace to allow for the subs, ports and bracing displacement...

[pro956]

so if i have 2 12" dvc aluminum eclipses...the total enclosure space is going to be larger than 6.4 cf for a sealed box? isn't that basically all the usable trunk space that we have???

3.5 cubic total for both subs, not each sub. That will fit in the trunk easily.. Again you will need to figure how much air each subwoofer displaces, the amount of air the port displaces and how much air any bracing will displace. After you have that figure then you have to determine how big the box needs to be to have an interior airspace of 3.5 cubic feet total. If you subs and ports and bracing use up .5 cubic feet then your box actually needs to be 4.00 cubic feet in airspace to allow for the subs, ports and bracing displacement...

heh, thought i was pretty clear
kronos understand now?