For example the EMI RS106A inductor capacitor filter. In fact it has pairs of inductors capacitors connected for each cutoff frequency.
Other example is using a capacitor and inductor for a particular cutoff frequency.
Or just an inductor in series with a variable resistance for a possibly variable slope Pleiades filter.
All these filter do not consume energy. And they do not need make up gain.
They can be even connected right at the output of a 200Ω mic.
There may be some noise using the RS106A as it may not be balanced.
Bibliography:
Elements of Sound Recording - Frayne, Wolfe
The Audio Cyclopedia - Tremaine
Motion Picture Sound Engineering
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