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RE: FWIW - plus calling Davey

Well, if I understand your question correctly, adding an inductor + resistor (wired in series) in parallel with the tweeter probably won't have much effect. The impedance seen by the amplifier will be modified such that the amplifier will see a lower than driver impedance at low frequencies, but at higher frequencies it would be like the circuit wasn't even there.

You're amplifier is functioning as a voltage source, ie, it's going to supply a voltage shaped by the line-level filter ahead of the amplifier. Anything wired just in shunt...without a companion series element...is not going to have a desired (or consistent) effect in the audio region. This is why the "capless" high-pass filter requires both elements (resistor and inductor) to work properly.

Cheers,

Dave.

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