loudspeaker phase checker

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Umm, a 1.5volt "AA" battery?? Just repeating what I saw on a site...

"Figure 21 seems somewhat incongruous at first sight, but I used it to ensure that all speakers were properly phased. When a positive potential is applied to the plus (+) terminal of a speaker, it is meant to produce a positive pressure wave, so the cone should move outwards. This is readily seen even with 1.5V on any speaker, and the current is low enough that it will not damage the most sensitive tweeter. "
 
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