Volt/Amp dependent RLC band pass -> Loudspeaker expander using lightbulbs
Here's where the problem starts: -



The output impedance of most audio amplifiers capable of delivering 10s to 100s of watts is going to be below 1 ohm. This means that if the L and C impedances perfectly balanced out (mid band) then you'd be loading the amplifier with a lightbulg and, guess watt (my little pun)... it won't make hardly one iota of difference - the amplifier will still deliver pretty much exactly the same amplitude to the speaker mid band as it would without the light bulb.

The light bulb will waste power of course.

If you want to cut midband you need a parallel tuned circuit wired in series with the speaker and what you then want is to lower the resistance across that parallel tuned circuit as power increases (the opposite to what a lamp does).