Low damping factor but fast& high current SS amps?

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Sorry

I just thought maybe you had since it is exactly the same wording in this Crown paper.

http://www.crownaudio.com/pdf/amps/damping_factor.pdf

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Zuio - your speaker, most likely, has inductor in series with the woofer. This inductor commonly has resistance of 0.08ohm (or more) making DF<100 no matter what amplifier you connect to it. Look in the middle of the table of the best solid core inductor I could find in Partsexpress:

http://www.parts-express.com/14-gauge-c-core-toroidal-inductors.cfm

It is very easy to have EMF without a magnetic field. Voltage without a path means no current. No current means no magnetic field.

The exact opposite of a dynamic system..... What do you call a charge without flow or motion? Static? I don't know.

And yes, it is a magnetic field that stops the motion......a magnetic field from a permanent magnet interacting with a magnetic field caused by a current flow in wire coil. To me, a 'chicken and egg' problem covered by the unified force called 'electromagnetism'.

You're right, though, no current flow = no magnetic field.....

I also like the idea of installing shorting wires on speakers being shipped. I think this is a good idea and will remember it if I ever ship speakers....even my panels! I've used a shorted speaker for another purpose. A simple 'thump' test to show the cone self damp when connected to a good, low resistance load.

OH, one other thing.....Kirkus speaks about the relation of enclosure size, TS parameters and where the term Damping Factor may come from. Good stuff.

I would add that many years ago, as watts became less expensive with the start of the SS 'era', speakers also changed....a lot, to the small, sealed boxes we know today.

Large enclosure speakers still exist, and they are still generally best with low power tubes, which also have a minimal measured damping factor....

And, for no particular reason....My panel also has an inductor in series with the woofer. In this case, Magnepan uses a 16ga iron core inductor of about 0.4 ohms DCR. This is one of those DIY items which causes some minor controversy in panel discussions. Some will put a monster aircore of as little as 0.2 ohms in the stock inductors place. This will have the effect of changing the speakers freuquency balance a little more bass-wards.

Looks like this thread go side-tracked into a 101 on definitions. LOL! :-) Anyway, it was an interesting read & a good refresher for me as well.

Now, to address Zuio's issue: I'm not sure that low damping factor (DF) & fast + high current can co-exist. DF is an indirect measure of an amp's output impedance so if you assume 8 Ohms nominal speaker impedance then higher the DF, the lower the amp's output impedance.
An amp's output impedance is a function of the amp's bandwidth - the higher the bandwidth, the lower the amp's output impedance will remain. If the amp's bandwidth decreases, the amp will not be able to follow the music signal & we get distortion & increased output impedance.
If output impedance increases, it will limit the amount of current that can be delivered to the load as more will be dissipated as heat in the output impedance.
So, I believe that high DF indirectly let's us know that the amp is trending towards high bandwidth (fast) & will be capable of high current delivery (if it's power supply is able & the music signal demands it). Correct me if I'm wrong. Thanks.