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I do not know which core and wire materials I shell need, I need to consult with my transformer people for that. As the starting point I plan to use that:

http://www.sowter.co.uk/acatalog/EQ_INDUCTORS.html

It might be good as is of I might order some custom coils with exotic cores, perhaps amorphous, I do not know at this point. I have very little experience with line-level low pass filters with coils. It is possible that the RC will do fine as well because the capacitance will be shunting the signal not bypassing the signal as it would be in high-pass applications. The curve is know:

http://www.goodsoundclub.com/PDF/FMDeemphasis.pdf

 and it shell not be hard to implement.

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