Are there magnetic cores for low frequencies (200 - 2000Hz)

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Hello

I wonder are there magnetic cores which are dedicated for low audio frequency range? (desired range: 200 - 2000Hz). On market I see mainly iron cores which are for very low frequencies and ferrite cores which are used at higher frequencies... What material would be the best for the above frequency range.

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Laminated steel/iron (or tape wound for toroids). Ferrites might be useable too, I have seen them on dial up modem cards.

Tom Pappano
Tulsa, Oklahoma

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Back in the 70's we used Ferroxcube ferrite cores for Tip Ring applications. (200 - 3400 cps (Hz had not quite caught on for us at that time...)) So, ferrite is an answer. We also used iron cores but ferrite cores are the standard now I believe.