less bass when windows up
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less bass when windows up
Ok so I have 2 10 inch subs behind my seat in my reg. cab truck. When my windows are down, there seems to be almost twice as much bass as when the windows are up? how does that work? Anyone expierience the same thing?
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From: Not this forum
Hold your hand in front of a sub when it's working,a couple of 12 inch subs moving in and out move a lot of air, it has to go somewhere.. In an enclosed small cab it'll go in and out of the ports in the subs' box...
However, if the sub box isn't ported, there will be a coresponding low pressure area behind the cone...So, if the box isn't ported and and the air can't move in and out of the cab it has to compress.....simple physics....
Now if you run a couple of big subs out of phase with each other it wouldn't be as bad , because one would be moving in as the other is moving out and they would cancel each other out...(might sound crummy though)
Feel free to correct me on this, I'm not an expert and I just made all that up!
I
However, if the sub box isn't ported, there will be a coresponding low pressure area behind the cone...So, if the box isn't ported and and the air can't move in and out of the cab it has to compress.....simple physics....
Now if you run a couple of big subs out of phase with each other it wouldn't be as bad , because one would be moving in as the other is moving out and they would cancel each other out...(might sound crummy though)
Feel free to correct me on this, I'm not an expert and I just made all that up!
I
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Joined: Jul 2005
Posts: 3,956
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From: Abilene, Texas
Originally Posted by 3 of 7
Hold your hand in front of a sub when it's working,a couple of 12 inch subs moving in and out move a lot of air, it has to go somewhere.. In an enclosed small cab it'll go in and out of the ports in the subs' box...
However, if the sub box isn't ported, there will be a coresponding low pressure area behind the cone...So, if the box isn't ported and and the air can't move in and out of the cab it has to compress.....simple physics....
Now if you run a couple of big subs out of phase with each other it wouldn't be as bad , because one would be moving in as the other is moving out and they would cancel each other out...(might sound crummy though)
Feel free to correct me on this, I'm not an expert and I just made all that up!
I
However, if the sub box isn't ported, there will be a coresponding low pressure area behind the cone...So, if the box isn't ported and and the air can't move in and out of the cab it has to compress.....simple physics....
Now if you run a couple of big subs out of phase with each other it wouldn't be as bad , because one would be moving in as the other is moving out and they would cancel each other out...(might sound crummy though)
Feel free to correct me on this, I'm not an expert and I just made all that up!
I
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From: Bixby, OK
It's the exact opposite with me. But then again, my exhaust is extremely loud, and my interior is sound deadened. So when my windows are down I hear the exhaust more than anything, and when the windows are up, I can hear the exhaust tones go up and down with my RPM's but I can actually hear music, and feel it!
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From: Central Ohio
I think some people should do some research on wavelengths of low frequencies, in comparison to high frequencies, and cancellation of wavelengths caused by standing waves, poorly made enclosures, etc. Opening a window or door changes the whole listening "room", so to speak, and the subwoofer performs differently. Keep in mind that a wavelength below 100hz can be as much as 50 feet long. A 2000hz is about 18 inches.
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From: Bixby, OK
True, wavelengths are going to be different with different frequencies. So if a wavelength is say, 50 feet long, how far up does that curve go? By that I mean, in between each upward peak it's 50 feet, so does that mean that the highest that wave goes is 25 feet above the source?
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From: Central Ohio
Discussion of sound waves is very complex. Any sound wave is a repetition of the same pattern. One rep of that pattern is a cycle. A wavelength is merely the distance over which a particular frequency completes one cycle through whatever medium is traveling, which in this case would be air. And that varies greatly by frequency. Many, many factors affect sound waves, how they travel, and ultimately how they are heard by the human ear. I encourage everyone who knows little about this type of thing to do some research. As I said, it's a very complex, but interesting subject.
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From: Leamington,On,Canada
If you can change the freq. you run the subs at you can try to fine tune the audio out of the subs......if not you might try to fill the box with a fill like dacron or the same fill you get at Wally Mart for pillows and stuff. What you are trying to do is to match the resonent (sp) freq. of the cab of the truck to what the freq. is comming out of the subs.
I have set up a few compitition setups and you always tune the subs to how you usually listen to the music......
For a pro in the competitions even adding another person in the cab will change the resonent freq and will not give the same sound (compaired on a program running a sound synth and wave annalizer---------not to your ears)
It is really the biggest thing when setting up a really good sound stage.
From what I here you are running a bit lower of a freq. out of the subs and that is why when you open your windows you make your sound stage bigger and thus you here your subs better..................what you want to do is get your subs playing at a higher freq. that will match your smaller sound stage....
I have set up a few compitition setups and you always tune the subs to how you usually listen to the music......
For a pro in the competitions even adding another person in the cab will change the resonent freq and will not give the same sound (compaired on a program running a sound synth and wave annalizer---------not to your ears)
It is really the biggest thing when setting up a really good sound stage.
From what I here you are running a bit lower of a freq. out of the subs and that is why when you open your windows you make your sound stage bigger and thus you here your subs better..................what you want to do is get your subs playing at a higher freq. that will match your smaller sound stage....
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