General SPL General discussion of Sound Pressure Level topics.

Cabin Pressure Q.

Old Mar 6, 2005 | 11:52 PM
  #11  
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try opening the windows when your driving and playing the music at the same time, when the bass hits it will blow the air out of the windows, then when it stops the air will blow in the windows....it's kinda cool and sounds funny.
Old Mar 8, 2005 | 11:14 PM
  #12  
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^ yeah I LOVE doing that. My mx6 has a moon roof, so it buzzes my hair. Its really cool.

Logically, wouldn't the windows being up ALWAYS make it louder? I know sometimes, the woofer can breathe much better if the windows are open, and therefore be more effecient, so it kind of cancels eachother out right?
Old Mar 9, 2005 | 07:09 AM
  #13  
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well.. when the windows are open, it kinda acts as like a ported box... that's the basic reason why it's louder with them open.


Livin loud
Old Mar 10, 2005 | 10:57 PM
  #14  
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Originally posted by Livin - Loud:
well.. when the windows are open, it kinda acts as like a ported box... that's the basic reason why it's louder with them open.


Livin loud
Bandpass. Not ported.

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Old Mar 13, 2005 | 09:12 PM
  #15  
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^^ yup...BP if you got a ported enclosure it's 6th order if you havea sealed box its a 4th order
Old Mar 13, 2005 | 09:23 PM
  #16  
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cool, so does anybody have any ideas of how to calculate or tune this "Bandpass" encloser? like are there any calculations towards figuring out the amount of area a given window has to be open, in relation to the vehicle cabin size? or is a termpro spl meter the best calculator out there?
Old Mar 13, 2005 | 09:41 PM
  #17  
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^^ because it wouldn't be very useful for competition, who knows, it might even become a CASPL class now that you mentioned it.
Old Mar 13, 2005 | 09:44 PM
  #18  
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oh geez...good question... find the exact airspace you have in the vehicle(assume its totally air leak free) calculate the opening of your window in square inches(port area)...and the thickeness of your window (port depth)
and thats about it ...there is really no point to it unless you're competing MECA or USACi where you are allowed to have doors or windows open... and even then its more hassle then its worth..just experiment with an SPL mic/sensor to find out what works best for something like that
Old Mar 13, 2005 | 11:20 PM
  #19  
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Originally posted by MTA:
oh geez...good question... find the exact airspace you have in the vehicle(assume its totally air leak free) calculate the opening of your window in square inches(port area)...and the thickeness of your window (port depth)
and thats about it ...there is really no point to it unless you're competing MECA or USACi where you are allowed to have doors or windows open... and even then its more hassle then its worth..just experiment with an SPL mic/sensor to find out what works best for something like that
Exactly. We're smart not genius! lol

That'd be near impossible to figure out but that would be how.

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Old Mar 30, 2005 | 04:13 PM
  #20  
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Im new here! This is a very informing forum
My System is WAY louder when my doors are open. How do I change this so my system is as loud when my doors are closed. I want to start to compete in SPL comps this summer. What do i Do?

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