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Message: <blockquote data-quote="forbidden" data-source="post: 778912" data-attributes="member: 552189"><p>Out of phase is noticeable as a major drop in output levels. It is easy to check with a small battery like a AA. Take the speaker leads off of the amp and connect one wire to the - terminal on the battery and connect the other lead briefly (very briefly) to the + terminal on the battery. The speakers cones will move one direction and go "thunk". DO NOT HOLD THE SPEAKER CONES LIKE THIS. If the subs both move the same direction at the same time, they are in phase, if they move in opposite directions then they are out of phase. Are the subs sharing one volume of airspace or are they in two separate ported boxes? How is the amp integrated into the stock stereo and where?</p></blockquote><p></p>

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