Subwoofer Phase

Some articles on phase, subwoofer:

Subwoofer - Construction and Features - Phase Control
... Changing the relative phase of the subwoofer with respect to the woofers in other speakers may or may not help to minimize unwanted destructive acoustic interference in the frequency region covered by both ... so generally provided as an adjustment for subwoofer amplifiers ... Phase control circuits may be a simple polarity reversal switch or a more complex continuously variable circuits ...

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