It would be nice to make a Pleiades DI transformer for electric bass with reduced inductance of the transformer winding at the guitar side.
5 Henries may be suitable.
It will operate as a Pleiades high pass filter in synergy with the pickup output impedance.
This would compensate for Fletcher Munson curves giving:
A beautiful bass sound that is not muddy or low end emphasized to our mind perception.
Amazing middle and high end detail reminding of the beautiful 60's electric bass recordings for example.
Other ways to get this sound is to just connect a Pleiades filter of say 5 Henries across the output of the bass guitar.
Or bypassing everything in the bass guitar and connecting the Pleiades filter (5 Henry inductor) in series with the tone control potentiometer and the combination in parallel with the pickup.
This would give a variable low cut or high pass as on an Sennheiser MD421 or MD441 moving coil microphone.
Or winding another winding to the Pleiades filter connected to the pickup. And using the secondary for giving a nice balanced output.
Suitable amazing magnetic cores can be Magnetec Nanocrystalinne Nanoperm ring tape wound cores.
The Pleiades filter is a gentle 6dB per octave filter. The turnover frequency is adjusted by the number of turns wound on the ring (toroidal) core. The filter is an LR filter. L is the inductor and R is the output impedance of the bass pickup or for example the voice coil of a moving coil microphone. Together they form a potential decider. The output at the pickup or voice coil becomes frequency dependent as the reactance of an inductor is frequency dependent. In few words, the highter the frequency the less the inductor short circuits the output of the pickup or microphone moving coil.
These techniques are used in world class microphones such as Electro-Voice RE16, Sennheiser MD421, MD441, RCA ribbon microphones,..., to compensate for the proximity effect, Fletcher Munson equal loudness curves, voice effort curves etc.
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