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Old 11-08-2009, 11:53 PM
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Default Help with compound enclosure

Ok, So i have 2 Oz audio Matrix elites (12.2) one is New in Box, The other is nearly new but used in wifes car for a year.

I plan to install them both into a new project using a compound (push\pull) design.

I realize these types of enclosures use the Properties from both speakers & and in the same enclosure space to create its sound.

Will i run into problems with the speakers "marrying" well in that type of enclosure?

Will the parameters of a used speaker change enough to make that kind of a difference when running in tandem with a new one?
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Old 11-09-2009, 08:56 AM
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Moved to enclosure section.
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Old 11-19-2009, 01:50 PM
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anyone?
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Old 11-19-2009, 02:05 PM
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You're going to put them in a compound isobaric enclosure?

Like this one?



I would recommend swapping the new one into your wife's car for a bit to break it in but if that is not possible it will not kill the sub to run them together before one is broken in.
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Old 11-19-2009, 02:14 PM
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Quote:
Originally Posted by coefamily View Post
Ok, So i have 2 Oz audio Matrix elites (12.2) one is New in Box, The other is nearly new but used in wifes car for a year.I plan to install them both into a new project using a compound (push\pull) design.
I realize these types of enclosures use the Properties from both speakers & and in the same enclosure space to create its sound.
Will i run into problems with the speakers "marrying" well in that type of enclosure?
Will the parameters of a used speaker change enough to make that kind of a difference when running in tandem with a new one?
In a push pull design, the sealed volume of air between the woofers makes their individual parameters disappear.
You can not used speakers of different xmax or impedance because that would be destructive.
The other parameters are not destructive and when mated the result is essentially one moving structure with double the suspension and double the motors with half the surface area so it is much less efficient but it can get lower in a smaller enclosure.
(you can use a new sub and an old sub together if they are the same model.)

I have seen paper/pulp cone subs destroy themselves when people accidentally forget to make sure the subs are moving the same direction. {the strongest cone won}

So anyway... much like everything else compound isobaric is a method of gaining control and reducing the resonant frequency of a speaker.
That was useful back when speakers were designed to be acoustically suspended and had high "VAS" [euivalent volume of air] as well as higher "Fs". [resonant frequencies]

Today, Subwoofers have great control and much lower VAS as well as low Fs.. So isobaric is not beneficial like it was with "loose" speakers

Last edited by iamsonic; 11-19-2009 at 02:38 PM.
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Old 11-19-2009, 03:47 PM
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THE ATTACHED PICTURE IS WHAT I HAD IN MIND



AS STOLEN FROM
Lincolntc690




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File Type: gif dual1.gif (1.9 KB, 3 views)
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Old 11-19-2009, 03:52 PM
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Thats not a compound loaded enclosure
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Old 11-19-2009, 04:18 PM
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THE ATTACHED PICTURE IS WHAT I HAD IN MIND
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Originally Posted by HiloDB1 View Post
Thats not a compound loaded enclosure
HiloDb1 is correct. That is just a normal sealed enclosure with one speaker mounted inverted.
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Old 11-19-2009, 05:30 PM
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Actually it considered a Push\pull design, But i was using the lingo used on this site for clarity purposes.


enclosure design pros n cons good read

So has anyone done this design (with good results anyway)
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Old 11-19-2009, 05:38 PM
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Quote:
Originally Posted by coefamily View Post
Actually it considered a Push\pull design, But i was using the lingo used on this site for clarity purposes.


enclosure design pros n cons good read

So has anyone done this design (with good results anyway)
That's silly.

it's just a sealed enclosure with one speaker inverted. {people are making sh!t up again}

sorry man.
there is nothing to be gained by doing that. because it changes nothing. except the displacement of the one speaker.
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