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1. The flat frequency response comes from two conditions ?- e..m.f . rises linearly with frequency (Faraday; this is not mathematiucal trick) ?and inductive Xl raises in the same manner. ?So we have constant loop current ?which is sensed with a very small Rin of the amplifier. So we have flat frequency response. This is in Thevenin representation.

3. If we do ignore omic resistance ?the serial inductance in Thevenin is transformed to the same parallel inductance in Norton model. The current source is the short circuit current which is constant.?
2. In this Norton model the parallel reactance is much higher and does not influence the load current. ?6 ohms load practically wipes out influence in frequency response of any parallel reactance above certain value.
4. In low frequencies ?this model does not work when the inductance X is in order of the ?load resistance since the current source is no more constant.
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