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In the Forum: Horn-Loaded Speakers
In the Thread: The African compression electromagnet drivers?

Post Subject: Statical flux vs. move vivid flux?Posted by Romy the Cat on: 8/12/2010

Erik, I do not think a resistor in series would do as it will burn on itself some voltage and the coil will be driven by the same voltages. It would be good to put in place of the resistor a rheostat and to slide it up and down while slide up and down the voltage of power supply and maintaining the same voltage on the field coil. This would indicate how the PS distortions might affect sound, at least hypothetically.

I think to conduct any more or less methodologically cleaner experiment the best would be to have the field coil with multiple taps. Make the coil standard 600V rated and to design the coil to have let say 4 taps that identically fill the bobbin. Let say it would be 12-48-96 and 192V. Then driving the coil from a powerful PS that has a lot of buffer it would be possible to switch taps on the field coil and adjusting the PS to maintain the same faux. I have such a PS – a vintage Fluke 409. It is a large PS that out puts up to 500V and up to .5A, the unit is all tubes and tube-regulated. I think I will make this experiment in future with my S2 driver, after I finish with what I am going through now. I have spoken a few month back with my coil guy and he agreed to wider the coil like this.

I think in your post above the key was “the field in the gap will be the same, at least in the statical case.” The statical flux is the same but dynamic characteristics of flux at higher voltage have to be different. I think because they will be different the resulting sound will be different.

The Cat

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