Re: Speaker Wire Loss Study

Posted by John Oppenheimer on Dec 21, 2018; 4:01pm
URL: http://elecraft.85.s1.nabble.com/Speaker-Wire-Loss-Study-tp7647228p7647278.html

The speaker wire loss study page:

https://www.kn5l.net/SpeakerWire/

is updated with #22 measurement and model. A good demonstration of vinyl
RF absorption. The larger #18 speaker wire with greater vinyl content
results with an increased loss over #22 speaker wire.

Where the #18 vinyl loss is three time the copper loss, the #22 vinyl
loss is two times the copper loss.

John KN5L

On 12/18/18 8:46 PM, John Oppenheimer wrote:

> There were some comments about speaker loss and the contribution of loss
> as a result of vinyl dielectric. A way to evaluate is to measure a
> length of speaker wire and compare to an air dielectric equivalent. Here
> is an example:
>
> https://www.kn5l.net/SpeakerWire/
>
> The Air dielectric equivalent model is for #18 with spacing for a Zo
> match with the speaker wire, 117 Ohm.
>
> Note that at 10 MHz, the speaker wire loss is over three times the air
> dielectric equivalent.
>
> A DC resistance of the speaker wire suggested that the wire size is
> actually closer to #19. Tough measuring these very low DC resistances,
> so decided to assume #18 for the air dielectric model.
>
> The speaker wire loss and Zo used a Zoc and Zsc data set. There are
> links to the two files for verification.
>
> Check my math!
>
> John KN5L
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