Beta 5r10

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 <[hidden email]>
> 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

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[Stephen G4SJP]

Very well put Dale, exactly as I see it too.

73 Stephen G4SJP

On 17 February 2015 at 02:17, [hidden email] <[hidden email]>
wrote:

> 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 <[hidden email]>
> > 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:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

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