- Thread Starter
- #41
so stereo uncorrelated shoud not be used for subwoofer I guess.Because uncorrelated signals sum "differently", and the summing is usually treated as a statistical (random) process. The resulting sum follows a probability distribution that can be described with a mean and standard deviation.
For two correlated signals (A & B) that are time varying, the relationship between signal A and signal B does not change with time. You can predict (determine) signal B from signal A when you know enough about the system.
For uncorrelated signals, you can't determine one from the other. Their relationship varies from moment to moment. And when they are perfectly uncorrelated, the relationship is random. That's why you get different sums from correlated and uncorrelated signals.
Below is from the Wikipedia page for correlation. The plots represents two signals X and Y. Each point (its coordinates x, y), represents the X and Y signals sampled at the same moment in time. The numbers above the plots are the Pearson correlation coefficients. When it is 1 or -1, the signals are perfectly positively or perfectly negatively correlated, and the points lie on a line. Once you have enough points to determine the formula of the line, you can predict any future Y from X, and vice versa. When the correlation coefficient is 0, they are perfectly uncorrelated and there is no relationship between X and Y. (The signals are often said to be independent of each other.) That's why correlated signals and uncorrelated signals sum differently.
thanks for the explanation I was kind of guessing that they had perfect cancellations in the signal but it seems to stop at 50hz, so I was wodnering if anything was wrong with sub or wiim but since I tried both I had doubts anything was wrong.
So how can one test all speakers with subwoofer included without correlated phase cancellation signal? by y splitting the output and using only L or R to subwoofer?
thanks alot.
