Open door=louder bass...how?

[matt_martin87 10+ year member]

Just something I've been thinking about. Can someone please explain why opening a door or rolling down the window can make a huge difference in SPL?

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[JeffyZ33 10+ year member]

In short, cancellation is the key.

 

[matt_martin87 10+ year member]

Can you go into detail? This is most intrigueing.(sp?)

 

[JeffyZ33 10+ year member]

No, I can't, but I'm sure someone can. How I understand it, though, is when it's all shut up you have waves cancelling eachother out. With the door open, you get less cancellation, therefore more spl.

 

[SSS 18734 5,000+ posts]

that, and decreased air pressure inside the cabin, theoretically allowing the subwoofer to play more efficiently.

 

[matt_martin87 10+ year member]

Hmm makes sense.

 

[Pyro_By_Nature 5,000+ posts]

All acoustics of the car //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[knukonceptz 10+ year member]

Ever see the hair stand vid's? kinda like a huge port. Air moves more freely with the door open.

 

[thch 10+ year member]

oddly enough i have an article specifically on this from some car audio magazine (not CAE).

simply put you've got a box inside a box. the box for the woofer is playing into a small space. its possible that opening the door will allow for more pressure to build up for the same reason a port on the box works.