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acoustic cancellation


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Ti240 
Member - Posts: 27
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Joined: January 29, 2005
Location: United States
Posted: August 15, 2005 at 8:20 PM / IP Logged  
i read in another thread that acoustic cancellation can make running two subs not as loud as running one (if power was to remain the same). How would i find out if acoustic cancellation would be factor in a given system? what kind of things would i need to know to? thanks.
2005 Nissan Frontier - stock
comming soon...
Eclipse CD8443 deck
Eclipse PA5422 4-channel
Infinity Kappa Perfect 6.1 front
MBquart DKE116 rear
Eclipse SW9122 the 12's
Eclipse DA7232 bass amp
haemphyst 
Platinum - Posts: 5,054
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Joined: January 19, 2003
Location: Michigan, Bouvet Island
Posted: August 15, 2005 at 8:57 PM / IP Logged  
If your woofers are in phase, your acoustic cancellation will be so low as to be practically unmeasureable. I wouldn't worry about it, you'll cost yourself more sleep than it will EVER be worth.
As long as your woofer(s) are one plane, you will be so close to absolute phase, there is not likely to be any equipment to be able to measure it effectively.
If one woofer is 1 inch further from you than the other, and you are reproducing a 20Hz note, the phase shift will be less than .5 degrees, which will NEVER cause you any kind of problems at all. You will not hear any kind of phase shift or acoustic cancellation of any significance 'till you reach somewhere around 22.5 degrees, which is approximately a 45 inch difference in baffle planes...
As I said, I wouldn't worry about it. Your ear will never know it's there, and any kind of "fix" you might apply at one frequency will be gone by the time you reach one octave above or below the "fixed" frequency.
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."
Ti240 
Member - Posts: 27
Member spacespace
Joined: January 29, 2005
Location: United States
Posted: August 16, 2005 at 7:27 PM / IP Logged  
ok thanks
2005 Nissan Frontier - stock
comming soon...
Eclipse CD8443 deck
Eclipse PA5422 4-channel
Infinity Kappa Perfect 6.1 front
MBquart DKE116 rear
Eclipse SW9122 the 12's
Eclipse DA7232 bass amp
haemphyst 
Platinum - Posts: 5,054
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: August 16, 2005 at 7:45 PM / IP Logged  
BTW, that's a sweet lookin' system you are building... The SW9122 and the DA7232 amp are an ASTOUNDING combination! You won't BELIEVE how much noise one 12 can make! Keep it sealed though! (Or should I say keep THEM sealed?) I am using that amp on one of those same woofers in my Civic, and it is nothing short of amazing. Deep, powerful, and FAST!!! I think you'll like...
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."

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