With for example the input transformer is made on a ring core...
Then it is easy to just add a few turns making a very low impedance winding.
Then a Pleiades filter can be connecte to this winding to compensate for Fletcher - Munson, voice effort curves.
The turns needed for the Pleiades LR filter would accordingly be very low.
If a very thin wire is used it may be easier to create a higher resistance to inductance ratio. Hence a gentler low cut slope without the need of an external resistor. So the R element will be inside the inductor itself. If more R is needed then some turns can be made anti wise from the normal methods of winding.
The objective is flat frequency response from producer's brain to listener's brain, see reference.
Reference:
Sound Picture Recording and Reproducing Characteristics - D. P. Lowe, K. F. Morgan
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