@Audiovet We are in a way on the same page. Higher than about 10 "damping factor" makes little difference in response. I was over reacting to the "where's the coil resistance" and DF of 1.6. General consensus is that speakers are currently designed to give flattest response with Voltage source input which would be high "damping factor: I believe the best systems should be designed with amp and speaker treated as a system, not two separate components. I intend to start looking at current source for speaker driving - measurements have shown lower distortion for a current driven speaker as opposed to a voltage driven circuit, but the plug and play nature of audio components disappears. But I am digressing, and adding to the confusion.