[Garidy]

An electromotive force (emf) is the potential that is inside an electric source, such as amplifiers, and the potential inside the source must terminate the potential outside the source. Therefore the emf is given by:

EMF is what drives the current that makes our audio equipment work!

https://www.youtube.com/watch?v=5_2kxJpereM#t=73

 

[RayDunzl]

EMF is what drives the current that makes our audio equipment work!

I know. I get a bill for it every month.

 

[Gaugster]

When you push on a speaker while monitoring the terminals you get what is known as a Back EMF.

I don't believe that term is used much in the Audio industry but since you brought it up. :blush:

 

[Happy Tom]

When you push on a speaker while monitoring the terminals you get what is known as a Back EMF.

I don't believe that term is used much in the Audio industry but since you brought it up. :blush:

The back emf creates damping factor in the amplifier, higher factors with lower input impedance.

 

[FMW]

EMF is simply the correct term for what we call voltage.

 

[jaddie]

The back emf creates damping factor in the amplifier, higher factors with lower input impedance.

Damping factor is the ratio of the source impedance of the amplifier to the impedance of the speaker.

 

[JHAz]

FWIW, without actually endorsing, here's a little something on damping factor and back EMF from the folk at Crown

http://www.crownaudio.com/media/pdf/amps/136224.pdf

 

[jaddie]

FWIW, without actually endorsing, here's a little something on damping factor and back EMF from the folk at Crown

http://www.crownaudio.com/media/pdf/amps/136224.pdf

Decent explanation of damping factor, though they imply it's a bigger deal that it actually is.

 

[Bill Fitzmaurice]

Decent explanation of damping factor, though they imply it's a bigger deal that it actually is.

SS amp manufacturers tend to do so, because SS has higher damping factor than tube. OTOH the Crown document doesn't mention the fact that all direct coupled SS amps have high damping factor, so it's nothing unique to Crown by any means. This is a much more balanced view, as the writer has no horse in the race:
http://www.diyspeakers.net/Article/Richard Pierce DAMPING FACTOR.pdf

 

[lovinthehd]

@Bill Fitzmaurice, link doesn't work.

 

[RayDunzl]

@Bill Fitzmaurice, link doesn't work.

Go here

http://www.diyspeakers.net/articles.php