A way is instead of boosting mid and high frequencies, to attenuate with a gentle slopes the low frequencies.
Pleiades filters can be very effective for this.
They're just an inductor (coil) connected to the output of the pickup coil ie in parallel.
Exactly the same principle of connecting a Pleiades filter to the output of a mic to make reproduction as flat as possible from singer's vocal chords to listener's brain.
An example value of inductor is 6H or Henries.
Setup, signal path:
Yamaha bass signal directly from pickup - Pleiades V5 preamp , connection to the input transformer secondary (6H) - mic input of realistic disco mixer (the V5 is deliberately pad attenuated at the output to get back to mic output level while at the same time as much tube sound by generously driving the second electron tube) - Sennheiser HD580
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