you were all right!!

[xtremebassjunky 10+ year member]

how did you come to that conclusion?

 

[Dozy_production 10+ year member]

*sigh* with his car audio intelligence //content.invisioncic.com/y282845/emoticons/graduate.gif.d982460be9f153bb54e5d4cb744f6ae8.gif//content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif

 

[xtremebassjunky 10+ year member]

Which brings me to my second point, kids. Don't do crack

 

[cotjones 10+ year member]

its kinda common sence if you understand sound waves at all

 

[the brick 10+ year member]

140.8 in the kick //content.invisioncic.com/y282845/emoticons/eyebrow.gif.fe2c18d8720fe8c7eaed347b21ea05a5.gif

 

[xtremebassjunky 10+ year member]

ok i'll explain it... the cancellation is caused by 2 different speakers playing the same signal...

yeah, but they have to be out of phase to cause cancellation.

even on a system with 2 identical subs cancellation exists... it's simply impossible to get rid of completely

right but because they are identical subs they are going to very close to each other in output.

but with 2 subs that are different sizes there is a greater possiblility...

a greater possibility to have it way out of phase.

with 2 15's instead of 1 you are increasing cancellation by more than 2 times as much

not really. actually it would easier to have the pair in sync with each other, than to use 1 15 and 1 10.

 

[xtremebassjunky 10+ year member]

its kinda common sence if you understand sound waves at all

you're right what was I thinking...

 

[cotjones 10+ year member]

140.8 in the kick //content.invisioncic.com/y282845/emoticons/eyebrow.gif.fe2c18d8720fe8c7eaed347b21ea05a5.gif

i'd be content with that... like i said i'm not competeing with it so thats louder than i would want to listen to it

 

[cotjones 10+ year member]

yeah, but they have to be out of phase to cause cancellation.


right but because they are identical subs they are going to very close to each other in output.

a greater possibility to have it way out of phase.

not really. actually it would easier to have the pair in sync with each other, than to use 1 15 and 1 10.

HE SAID 4 10's and 2 15's! not just a pair of 15's.... lemme spell it out for you...

(2) 15's and (4) 10's would have way more distortion than (1) 15 and (4)10's...

and yes in audio period if there it more than 1 speaker cancellation DOES happen...

 

[xtremebassjunky 10+ year member]

HE SAID 4 10's and 2 15's! not just a pair of 15's.... lemme spell it out for you...
(2) 15's and (4) 10's would have way more distortion than (1) 15 and (4)10's...

and yes in audio period if there it more than 1 speaker cancellation DOES happen...

as mentioned in my previous post, 2 subs (same sub) of equal size with the same input will be very to the same output. yeah it's going to be a little out of phase but not alot.

the reason they sounded like shit was because the 4 10's thrown in with it weren't in phase with the 15's.

 

[xtremebassjunky 10+ year member]

xtremebassjunky , bdubs767 , cotjones , Crown_amps , envengineer , Kevokrook77 , mtlhead , Pyro_By_Nature , Towncar , type[s5] , XylerB

(11 members and 0 guests)

hmmm...

 

[xtremebassjunky 10+ year member]

where is the genius highschoolers answer?

btw. the 4 10's would still sound like shit even if they were with just 1 15.

 

[cotjones 10+ year member]

as mentioned in my previous post, 2 subs (same sub) of equal size with the same input will be very to the same output. yeah it's going to be a little out of phase but not alot.the reason they sounded like shit was because the 4 10's thrown in with it weren't in phase with the 15's.

sound waves comeing from subs arent just those 2D pictures you are used to seeing, they are 3D and go throughout the entire car everytime the wave bounces of any surface in your car that is the effect of another sound wave to cause cancellation... i mean seriously, do you know what cancellation is? the difference in cancellation in same sub and different sub setups isn't really all that much to worry about sound waves are huge!!! it's not too easy for them to cancell significantly in any senario... after the waves have bounced a few 100 times yeah cancellation probably have a big effect, but at that point, so what?

 

[envengineer 10+ year member]

HE SAID 4 10's and 2 15's! not just a pair of 15's.... lemme spell it out for you...
(2) 15's and (4) 10's would have way more distortion than (1) 15 and (4)10's...

and yes in audio period if there it more than 1 speaker cancellation DOES happen...

Quit talking about different numbers of different sized woofers, it doesn't matter. If you have one wave at its crest (+1) and it intersects a wave with a similar amplitude at its trough (-1, and thus a phase shift of 180 degrees), you get 0 (cancellation). It doesn't matter where the drivers are, what size they are, etc. What matters is what happens at the listening position. Obviously if your waves are in sync (0 degrees of phase shift) at the listening position, you will have a doubling of the amplitude at the listening position (say the front drivers seat) but if you get in the rear passenger seat it might sound totally different if you have a phase shift of 180 degrees at that point.

I'm not sure why you bothered messing with frequencies or any of that crap before switching the phase, as it is the root cause of cancellation regardless of frequency, level, etc.

You are correct in saying that any system with more than one speaker has cancellation, but it doesn't have to occur at all listening positions.

Constructive interference is shown with lines labeled C, destructive interference is labeled with D. Obviously you would want your meter on one of the Cs.

 

[cotjones 10+ year member]

Quit talking about different numbers of different sized woofers, it doesn't matter. If you have one wave at its crest (+1) and it intersects a wave with a similar amplitude at its trough (-1, and thus a phase shift of 180 degrees), you get 0 (cancellation). It doesn't matter where the drivers are, what size they are, etc. What matters is what happens at the listening position. Obviously if your waves are in sync (0 degrees of phase shift) at the listening position, you will have a doubling of the amplitude at the listening position (say the front drivers seat) but if you get in the rear passenger seat it might sound totally different if you have a phase shift of 180 degrees at that point.
I'm not sure why you bothered messing with frequencies or any of that crap before switching the phase, as it is the root cause of cancellation regardless of frequency, level, etc.

You are correct in saying that any system with more than one speaker has cancellation, but it doesn't have to occur at all listening positions.

Constructive interference is shown with lines labeled C, destructive interference is labeled with D. Obviously you would want your meter on one of the Cs.

this is a really good post... and very acurate.... with the back door closed and the front windows down you can hear it way far away... when you open the back window it's a little quieter and with the back door and window open it's horrible