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  #1  
Old 01-19-2012, 08:20 PM
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Default Getting a better understanding on Specs: Q

I have been doing some reading about what certain Specs mean. Up until now, all i have really understood was Fs and BL. I have been mainly looking up the Q and what it means.

From what I have gathered, it is the dampening factor, or the sub's theoretical obedience at it's resonant frequency under ideal testing circumstances. Am I along the right track?

The thing that is kind of stumping me is in comparing subs of the same line. For this i am just looking at sundown's SA line for learning purposes. Why is it that as the Speaker size goes up, the Qms goes down and the Qes goes up? I can understand the Qms going down simply because more mass is harder for the same size coil to control, but why does the Qes go up?


Specs I am looking at, for anyone wondering what i mean.

SA-8
Qes: 0.513
Qms: 6.606
Qts: 0.476

SA-10
Qes: 0.52
Qms: 5.41
Qts: 0.48

SA-12
Qes: 0.58
Qms: 5.34
Qts: 0.52
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  #2  
Old 01-20-2012, 07:56 AM
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bump. we gotta have some smart guys around here.
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  #3  
Old 01-20-2012, 07:59 AM
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  #4  
Old 01-20-2012, 08:29 AM
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Quote:
Originally Posted by CousinVin View Post
I have been doing some reading about what certain Specs mean. Up until now, all i have really understood was Fs and BL. I have been mainly looking up the Q and what it means.

From what I have gathered, it is the dampening factor, or the sub's theoretical obedience at it's resonant frequency under ideal testing circumstances. Am I along the right track?

The thing that is kind of stumping me is in comparing subs of the same line. For this i am just looking at sundown's SA line for learning purposes. Why is it that as the Speaker size goes up, the Qms goes down and the Qes goes up? I can understand the Qms going down simply because more mass is harder for the same size coil to control, but why does the Qes go up?


Specs I am looking at, for anyone wondering what i mean.

SA-8
Qes: 0.513
Qms: 6.606
Qts: 0.476

SA-10
Qes: 0.52
Qms: 5.41
Qts: 0.48

SA-12
Qes: 0.58
Qms: 5.34
Qts: 0.52
qes goes up for the same reason qms is going down.

qes from my understanding is how well the motor controls the cone.. when it(the cone) is heavier it requires more force applied to move therfor the motor has less control over it...

the sa-8 is a completely different woofer than the 10-12-15.
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  #5  
Old 01-20-2012, 10:09 PM
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I guess that makes sense. I'm surprised no one else has chimed in here.

Qes from what i read is the speaker's electric obedience
Qms is he speaker's mechanical obedience
and Qts is the overall.
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  #6  
Old 01-21-2012, 04:44 AM
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Sounds like you're on the right track, man. Keep reading and report back here with your findings

Honestly, I read and read about all of that last year sometime and I absorbed about 10% of it because it really doesn't make a whole hill of beans in my world. 90% of my subs would need TSP's pulled because they're not stock and I'm not sitting there crunching numbers trying to decide between 1.647 or 1.692 cubic feet of airspace.

It's nice to know what's going on "under the hood" though.
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Old 01-21-2012, 07:57 PM
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Might need to read something like this to get a good grasp on the details, DIYMA.com - Scientific Car Audio - Truth in Sound Quality and this, T/S parameters... what are they good for? - DIYMA.com - Scientific Car Audio - Truth in Sound Quality
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Old 01-21-2012, 09:36 PM
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Quote:
Originally Posted by schmiddr2 View Post
Thanks for the links. Very informative.
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