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sound cancellation


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Nootch 
Member - Posts: 1
Member spacespace
Joined: June 13, 2005
Posted: June 13, 2005 at 9:46 AM / IP Logged  
I am designing a box to match the same concept as my friend who is a current installer. Myself being a former installer. But i keep on getting people arguing with me about sound cancellatoin in my design. SO i though i would take it to people who might know more about this.
the design of the box is as follow
sound cancellation -- posted image.
Now everyone is saying that if the subs fire at each other, i get cancellation... but installation memory, and present knowlege from my friend states that if the subs fired with each other (one wired backwards) then cancellation would be present.
anyone have a definitive answer to this problem?
Sincerely
Kyle.
haemphyst 
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Platinum spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: January 19, 2003
Location: Michigan, Bouvet Island
Posted: June 13, 2005 at 10:13 AM / IP Logged  
It'll work. Just make certain your wiring is the SAME, not reversed. You want both of them to be producing positive pressure at the same time. This means they need to be moving in/out WITH each other, thus, in phase. There is no problem doing it this way.
It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."
Poormanq45 
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Joined: October 27, 2004
Location: United States
Posted: June 13, 2005 at 11:42 AM / IP Logged  
ACtually there WILL be a slight cancellation. Not muhc, but it will occur. This will be caused by the fact that there IS a distance between the two subs. This will cause a slight phase shift. Probably in the area of 5~15degrees.
For cancelation to NOT occur the driver faces would have to be coupled directly together.
Either way, it's a good looking design. You probably won't be able to notice the slight cancellation
SoundAudio 
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Copper spaceThis member has made a donation to the12volt.com. Click here for more info.spacespace
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Posted: June 13, 2005 at 12:33 PM / IP Logged  

There is no evidence in physics that long waves (bass waves) will cancel each other out in a small atomosphere such as a car intereior.  Steve Brown at Alpine  has stated this.  The only thing you might experience is coupling, but coupling can change with the location of the listener in  the vehicle.  I think the design looks like a good one.  And remember that a  lot of knowledge can be gained through trial and error.  Best of luck.

ss-installer 
Silver - Posts: 444
Silver spacespace
Joined: February 27, 2005
Location: United States
Posted: June 13, 2005 at 6:45 PM / IP Logged  
looks good. take some pics of construction for us.
Poormanq45 
Silver - Posts: 597
Silver spacespace
Joined: October 27, 2004
Location: United States
Posted: June 14, 2005 at 2:20 PM / IP Logged  
soundaudio wrote:
There is no evidence in physics that long waves (bass waves) will cancel each other out in a small atomosphere such as a car intereior. Steve Brown at Alpine has stated this.
This experiment right here Aiming Woofer has proven otherwise

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