well, I don't have much to add after what's said, about this subject you can't fill two lines in witch there sais it all...
what I can tell you is that the speaker itself is as you probably know a electrical->mechanical->acoustical transducer so it has different...
it's gonna be a bit complicate to describe,so bare with me:
have two inverters in series, with a resistor from the end to beginning ; from the end, through another resistor, in a third inverter wich has a capacitor in parallel; a third resistor should be placed from one end to another of the...