phase coherency is necessary for maximum enjoyment .
[QUOTE]It destroys impact and obliterates low end. It makes musical tracks sound thin and lifeless . [/QUOTE]
[QUOTE]Phase cancellation is a an audio phenomenon where the waves of multiple tracks work against each other to eliminate certain frequencies. The resultant sound is often flat or dull.[/QUOTE]
Integrating a subwoofer into your system is challenging because the subwoofer is optimized for putting out lots of low bass, not for reproducing detail. The main speakers’ upper bass is quick, clean, and articulate. The subwoofer’s bass is often slow and heavy. The word “slow” in this application is not technically correct, but vividly describes how such a subwoofer sounds. More precisely, a “slow” subwoofer is one that has excessive overhang: the cone keeps moving long after the drive signal has stopped, which conveys the impression that the bass is “slow.”
Phase cancellation occurs when two signals of the same frequency are out of phase with each other resulting in a net reduction in the overall level of the combined signal. If two identical signals are 100% or 180 degrees out of phase they will completely cancel one another if combined.