I was afraid that’s what it meant. I haven’t done Emag calculations since college but I feel like induction would only work at extremely close distances (as in centimeters) if at all, right?
All those induction experiments have multiple loops, tightly around the passing magnet for a reason since changes in the current is directly proportional to changes in the magnetic flux density (and only the ones normal to the surface area created by a closed loop).
And the closed loop created by the speaker and its source is a really irregular shape, designed to have a small cross-sectional area anyway. It all sounds kind of fishy.