Just wondering, exactly how much vas (preferably in ft^3) in the rear hatch compartment of a thirdgen camaro? Are all cars space in the back the same? If no, how do they differ, by model (RS,Z28)or by year?
Tanks for the help.

 

Check out the thread "who's got a custom sub box". Acting as Dr. Science, wrote it all out.

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'82 Firebird, dead stock, 9 bolt disc rear, over 200,000 miles and still going strong, more to come...

 

the "vas" that you see as part of a speaker's parameters has virtually NOTHING to do with how much airspace the speaker needs. It is a measurement of how much air the speaker displaces under a certain condition (maybe full excursion? It's been a while). In any event, that number, along with a ton of other thiele/small parameters are thrown into a huge equation to determine how much airspace that sub needs. To repeat, that number is not the amount of airspace you need. Contact the manufacturer to find out what size box the sub is designed to properly operate in. I guarantee it will be a whole lot smaller than the "vas" spec for the sub.

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The IROC Homepage
<A HREF="http://www.rit.edu/~jli4307/camaro" TARGET=_blank>
View the restoration of an 85 IROC</A>
"I didn't know a bored out Ford could go so slow" -Shenandoah

 

VAS: Voulumetric Air Space. The volume of the enclosure measured in cubic feet of air.

 

I repeat: Vas is NOT just the box volume that you need. The Vas is the compliance, the volume of air equivelent to the mass of the speaker. The Vas can be found with the following equation:

Vas = Vb((Fb/Fs)^2 - 1)
where Vb is the volume trapped by the speaker and box Fb is the resonance frequency of speaker and box.


------------------
The IROC Homepage
<A HREF="http://www.rit.edu/~jli4307/camaro" TARGET=_blank>
View the restoration of an 85 IROC</A>
"I didn't know a bored out Ford could go so slow" -Shenandoah

 

So that means that to get the right sound out of a ten inch sub with one cubic foot of air space requires you to install ten or more in the car? I don't think so. VAS does not refer to the space inside a vehicle, or wherever you decide to put the speaker, but to the box.

I may be wrong, where did you get your info from? Seeing how no matter what you buy, cheap or top of the line, the instruction book tells you to build a box with "X" amount of air space. Not to install it into a car that is "X" big.

 

You are wrong. You're not listening to what I'm trying to tell you. The Vas has ABSOLUTELY NOTHING TO DO WITH AIRSPACE IN, OUT, NEAR, OR FAR FROM THE BOX. The Vas is just the equivalent volume of air that is equal to the mass of the speaker. Air has a specific mass per unit of volume, and therefore the mass of the speaker can be measured by the equivalent amount of air needed to attain the same amount of mass. That's it. Nothing to do with the box, or anything else. It's a 3 dimensional quantity, so therefore is measured in a volumetric quantity. Your glass of milk can be measured in cubic feet too, but that doesn't mean that there is milk in your stereo.

------------------
The IROC Homepage
<A HREF="http://www.rit.edu/~jli4307/camaro" TARGET=_blank>
View the restoration of an 85 IROC</A>
"I didn't know a bored out Ford could go so slow" -Shenandoah

 

Hey Jim, just to let you know, I just finished reading some info and I must have read wrong in the past. You are right. The cubic voulume of the box has nothing to do with the volumetric air space equivalance of the speaker itself. Thank for setting me straight.

 

I'm sorry I was so harsh dude, but when I'm not sure of something, I come right out and say it. When I'm sure, I'm sure. In my first post I was speaking purely from memory, so then I went out and dug up the accurate information and re-posted with that accurate info. I turned out to be pretty much correct the first time, but I did double check myself and verify with word-for-word information from multiple online sources.


------------------
The IROC Homepage
<A HREF="http://www.rit.edu/~jli4307/camaro" TARGET=_blank>
View the restoration of an 85 IROC</A>
"I didn't know a bored out Ford could go so slow" -Shenandoah

 

No worrys, but what is VAS for? Is it the refering to volume of space that you're installing your speaker? Like the size of your room? I know that in a house, the bigger the room, the bigger the speaker that you need. And people that have small rooms, that put big speakers, they don't sound as good. Is this the case with VAS?

 

Sorry dude. I've explained it 4 times. I'm not doing it again. Go buy a book.

------------------
The IROC Homepage
<A HREF="http://www.rit.edu/~jli4307/camaro" TARGET=_blank>
View the restoration of an 85 IROC</A>
"I didn't know a bored out Ford could go so slow" -Shenandoah