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RE: What makes a driver High Efficiency?

Exactly! Direct radiators (K<<1), to have flat response have an acceleration controlled response.

I think the hard part to get is how the motor works, it's a small series inductance and a DC resistance in series with the loss less motor BL, that BL can also be expressed as Newtons of force per Amp of current but it is also a generator who's voltage proportional to BL and the motion velocity and called back EMF. The higher the BL, the greater the back EMF, they are hand in hand.

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