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<blockquote data-quote="squeak9798" data-source="post: 1542943" data-attributes="member: 555320">Sound waves are...well, waves.&nbsp; They consist of peaks and valleys, like any other waveform.Reversing the &quot;phase&quot; of the signal reverses when the peaks and valleys of the signal occur.&nbsp; And reversing the polarity at the speaker determines when the speaker moves in or out in relation to the signal (this is called absolute phase).For things like a phase switch on an amplifier or phase reverse in a HU, it&#039;s going to actually reverse the phase of the signal itself by 180 degrees.&nbsp; For example, the original signal (like on a CD) has a pattern of &quot;peak, valley, peak, valley&quot;, then the amp or HU will reverse the pattern to be &quot;valley, peak, valley, peak&quot;.Likewise, if you reverse the polarity of the wiring at the speaker&#039;s terminals (+ speaker terminal to - amplifier terminal, - speaker terminal to + amp terminal), then the speaker is going to move in when the signal is at a peak, and move out when the signal is at a valley.&nbsp; Whereas with &quot;normal&quot; wiring, the speaker would move out with a peak and in with a valley.&nbsp; Simple way to demonstrate reversing the polarity of a speaker is to grab a 9V battery.&nbsp; Touch the + speaker terminal to the + battery terminal, and negative to negative.&nbsp; The speaker will excurt outwards, and hence is in absolute phase.&nbsp; Now reverse the wires....+ speaker terminal to - battery terminal and - speaker terminal to + battery terminal.&nbsp; The speaker will move inward, and is out of absolute phase.</blockquote>

[QUOTE="squeak9798, post: 1542943, member: 555320"] Sound waves are...well, waves. They consist of peaks and valleys, like any other waveform. Reversing the "phase" of the signal reverses when the peaks and valleys of the signal occur. And reversing the polarity at the speaker determines when the speaker moves in or out in relation to the signal (this is called absolute phase). For things like a phase switch on an amplifier or phase reverse in a HU, it's going to actually reverse the phase of the signal itself by 180 degrees. For example, the original signal (like on a CD) has a pattern of "peak, valley, peak, valley", then the amp or HU will reverse the pattern to be "valley, peak, valley, peak". Likewise, if you reverse the polarity of the wiring at the speaker's terminals (+ speaker terminal to - amplifier terminal, - speaker terminal to + amp terminal), then the speaker is going to move in when the signal is at a peak, and move out when the signal is at a valley. Whereas with "normal" wiring, the speaker would move out with a peak and in with a valley. Simple way to demonstrate reversing the polarity of a speaker is to grab a 9V battery. Touch the + speaker terminal to the + battery terminal, and negative to negative. The speaker will excurt outwards, and hence is in absolute phase. Now reverse the wires....+ speaker terminal to - battery terminal and - speaker terminal to + battery terminal. The speaker will move inward, and is out of absolute phase. [/QUOTE]

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