ABSTRACT
The term given to the situation when the moving elements of two loudspeaker systems, in response to simultaneous identical signals, move in opposite directions. The sonic effect, if the listener is seated an equal distance from each speaker, will be for normally centered images to take on a vague and directionless characteristic. Bass response will also be reduced in strength. It is therefore important to have all speaker systems in an audio installation, including those in multispeaker surround-sound setups, wired as much in phase as possible. If the speaker models are different from each other (the center and surrounds are typically different from the left and right mains), this can be tricky to pull off effectively.
