Low damping factor but fast& high current SS amps?

All this talk of damping factor without a single tip of the hat to the 'q' of the speaker.
Critically damped speakers...Q-0.707 need much less amplifier damping.
Hi Q speakers can benefit from higher amp damping factor, but only to a point.

Electricity and magnetism are interchangeable. Think of a shorting strap as an amp with low resistance to the back EMF generated in the speaker.

In a dynamic system, I rather doubt you can have one without the other.

That the speaker generates the energy which damps its motion is without question.
And, since speakers store energy for later release, I'm not too uncomfortable calling it back EMF.......

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.

If I may, a question more related to the original post, and Kij's comments, above.

Doesn't high damping factor also indicate high feedback? I know, right now, that though I am a satisfied 'd' owner, I'd swap it out for a Pass amp. Low feedback, reasonable output while remaining in class 'a' and a minimal number of gain stages. Simple, perhaps, and direct?

Feedback may be even more controversial than damping factor!

Kij, buy one and take it apart?

As far as I can tell, feedback and DF are the 'Third Rail' of stereo discussions. Look at the 'beating' I took from a stickler for physics.

The take I've heard on feedback makes some sense. Global...from output to input, is a no-no. Minimally applied feedback....by stage...is OK. I've read a paper, complete with scope photos, claiming increases in certain distortion products as a direct result of feedback.

Now, I've worked in the Semiconductor manufacturing industry. Maybe you can explain something to me.....
We have a measured parameter called RDoN....Resistance of the Device in the ON state. Low enough that if the device were ON, it would yield a fairly high DF, especially if several devices were in parallel or P / N devices were in a push / pull configuration. How does feedback lower DF? Get as technical as you like.