Phasing

[seedubs1 10+ year member]

Is the sound wave comming off the back of the sub 180 deg. out of phase with the sine wave comming off the front of the sub?

Or is the wave in phase with the wave off the front?

Just trying to figure out the wave length to get the phasing lined up with my new box design.

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[x2o 10+ year member]

Logically I'd assume opposite phase. It should be producing the exact inverse of the front wave.

 

[seedubs1 10+ year member]

That's what I thought by thinking about it.

I just want to make sure before I go ahead and design this **** box.

And does anyone remember what geometric center is for sine waves between 20 and 80 hz? Not average center (obviously 50 hz). I think geo. center is 45 hz if I remember correctly.

Sorry, it's just been a while since I designed a good box.

 

[seedubs1 10+ year member]

Nobody???

 

[seedubs1 10+ year member]

I know someone around here is smart with this stuff. There's some loud people on here, and I know they aren't all just dumbing into it.

 

[phemps 10+ year member]

yes thats why free air subs lack all bass. rear wave 180 degrees out of phase with front wave cancels out

 

[seedubs1 10+ year member]

Nice. Now I can get to doing some work.

Thanks man.

 

[thch 10+ year member]

agreed, and as always remember that sound is based on pressure and not specifically on the direction a speaker is facing. its all too easy to confuse the effective "direction" of a speaker based on the angle it is mounted.

not sure what you mean by "geometric center", but the geometric mean is 40hz (1.00 octave up from 20hz and 1.00 octave down from 80hz)