pink noise, correlated vs uncorrelated

[CobraVin]

i know one is stereo, the autosound 2000 disc says to find an in between

my rta's are different, should i lean towards one or the other, thanks

[bikinpunk]

isn't correlated where they are in phase, or am I wrong?

I listened shortly to them on a laptop computer and it seemed the uncorrelated was out of phase. If that's the case, then I'd shoot for the correlated measurements.

*just guessing here*

Now that I think about it, maybe the uncorrelated is designed to center with.

I'd like to know the answer myself.

[chad]

Think about the word correlation, that will explain it all.

[bikinpunk]

Originally Posted by chad

For example a correlation meter shows phase difference between two channels.

This is supposed to help.

Why does it not?...

[chad]

I edited,

http://en.wikipedia.org/wiki/Correlation

Look at this section :Correlation and linearity:

[CobraVin]

i know one is stereo, thats why i put that in there

but my question is, should i use one more than the other for eq ing or just split the difference, didnt know if a car environment leaned more towards one or another

the cd tracks that play left and right channels seperatly are un correlated, so im just trying to guestimate, thanks

[chad]

I use correlated because I feed it a mono signal when tuning.

Sorry about the vauge response last night, Mrs, Chad was frisky and, well, you know. I'll try to get a better response typed up soon.

[CobraVin]

actually the left and right tracks just say "pink noise 20hz to 20khz left channel only"

hey bro no need to appoligize for that, i understand completely, priorities,in fact i was just about to go to home depot to pick up some concrete for 15 sections of fence im putting up and noticed how quiet it is in my house, hey the baby is sleeping and the older one is in school, hmmm, i can still make it into work by 4, hopefully the wife is not napping, ....ummm, bye

[CobraVin]

yeah oh well, at least i made it to home depot and work on time

ok so Chad likes correlated, anyone else?

i am measuring left and right seperatly but wondered when i play both sides with correlated vs uncorrelated which is more accurate to whats really going on, or should i just stfu and split the difference,thanks

[squeak9798]

From Kevin7909 on ECA:

It does make a difference whether it's in stereo or mono. A large difference actually. Stereo pink noise is 'uncorrelated'. Therefore it is not associated with the pink noise on the other channel. This minimizes problems with standing waves, etc. Mono pink noise does not share this attribute. This is easy to test. Play stereo pink noise and try to set your time alignment. You can't.

The reason is that the left and right speakers must have a similar signal for us to compare the distance between them based on time differences. We will place the soundstage using SPL with stereo pink noise. Mono pink noise has the same signal through both speakers at the same time so we can compare the time differences between the two sources. Therefore, we can hear the soundstage moving across the vehicle with mono pink noise while changing the TA settings on our processors.

Basically we set frequency response using uncorrelated (stereo) pink noise. We set time alignment by ear using correlated (mono) pink noise. (bold emphasis mine)

Kevin