Drk, did you measure them with voltage going through them? Their magnetic field grows considerably with voltage.
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What Ken said. If you have the means, hook an o scope up to one coil, then play music/signal through the leg with the other coil. Orientation and space are your friends.
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As others are eluding to, it isn’t the inductance value that I’m worried about. It is the “crosstalk” that occurs when the magnetic fields intermingle from the signal passing through.
A coil of wire is a transformer primary looking for its secondary. I get that. But the steel bar itself is identical to a dipole electromagnet. There’s not a lot of flux that extends directly out from the “tip” of the bar.
How would you devise an objective test? Let’s say a 3mH bar, with random woofer for load. Set a couple sine wave frequencies at maybe 8V, and then run an impedance sweep on the air core via DATS?
The lower right bar core is in the same orientation as the air core above it.
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