It seems that the term "Polarity" could be applicable to a single device, such as a loudspeaker, without reference to any other device. Connect the plus terminal of a 1.5v battery to the (+) terminal of a loudspeaker, and presumably the cone will move outward. Reversing the polarity of either the battery or the loudspeaker (but not both), will cause the cone will move in the opposite direction.
But the "Phase" of a single device/measurement is kind of a meaningless concept without reference to another device/measurement. So perhaps the proper terminology is dependent upon context. At least that distinction works for my simple mind. 73, Dale WA8SRA > On Mon, Feb 16, 2015 at 2:09 PM, Stephen Prior <[email protected]> > wrote: > >> ... polarity is to do with the direction in which the loudspeaker cone >> moves for a given direction of >> audio frequency current (Fleming's left hand rule etc.). So if two >> speakers have the same "polarity" then they will both move forwards or >> backwards at the same time... > > =========== > I realize this discussion is kinda pointless and not worth prolonging, but > nonetheless... it seems that if both speakers go in and out at the same > time, the resulting sound waves would be in phase; whereas if one speaker > goes out when the other goes in, the sound waves would be considered to be > out of phase (i.e. the compressions and the rarefactions would cancel). So > at least in the case of a pair of speakers sitting side-by-side and fed > with the same audio, switching the so-called "polarity" of one would > indeed > change its phase relative to the other by 180 deg. > > Tony KT0NY ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
