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RE: OK, let's try a different angle. It's an AC circuit, right?.

I think your missing a key part of this.

A microphone detects the sound, it proportionally turns the pressure into a Voltage which is the then the converted audio signal. Microphones all have a "sensitivity" or what Voltage X pressure produces. From here forward, the audio signal is a Voltage signal that represented the pressure.

When recorded on tape, that signal is changes in the magnetic field and polarity, on a record album the audio signal is proportional wiggles in the groove, in stereo those wiggles are _ + 45 degrees off axis.

In an old time movie sound track the audio is encoded into a variable light transmission sound track band. All of these are methods to record / store the audio signal recorded as Voltage signal that represents the air pressure.
In digital format i use, that Voltage is "sampled" and turned into a Voltage measurement every 1/48000 second.

How electrodynamic loudspeakers work at level 1 is simple, they cannot produce sound unless something moves the radiator and it is the VC current that results from that Voltage signal that produces force that moves the radiator with the force being the BL product (in Newtons per Amp).





Edits: 05/29/25

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