Can anyone identify this inductor?
Its a speaker crossover from a well known brand. Most coils on it are standard air coil style... but one looks like a transformer - wound vertically around a HUGE iron core which protrudes out the sides, then varnished/sealed and puttied to the board. Stamped with the company’s name on it. (All other components look sourced).
I reached out to the company waiting for an answer, so I won’t mention the name. But I don’t think they will reply.
Iron inductors seem like a no-no. In fact, I got huge coherency improvements by taking anti-static and EMI measures on it with some usual hi-fi tweak products. I do not know if they even tried to orient it correctly.
Anyone know? cheers
Sounds like you identified it to me 😁 Iron core inductors work just fine, in fact often better because their DC Resistance (DCR) is lower since they don't have to have nearly as much wire involved to reach a certain inductance value. |
You lower the DCR because you need to lower the DCR. Lowering it in an existing/working crossover can be detrimental. Working with DCR can help you compensate for baffle step effects without a separate baffle step compensation circuit. One major reason you might want to go with iron core is that otherwise your coil would be too big. If you need high inductance, low DCR and smaller size/cost iron core is the way to go. More inductance = more windings, longer wire. Naturally, more wiring would normally add DCR so at a certain size of indcutance, like you might need with a very low frequency low pass filter a standard air core may be too big or heavy or expensive or impossible. |
@clustrocasual ^^This. |
I just happened to discover it. Its a Lundahl which was rebranded to the loudspeaker company, maybe a slightly custom one, but markings on the label and the rest of it is identical. Its in the crossover.
Lundhal says :
Tube microphones. Silicon-iron C-core, which results in a transformer
So, was this chosen for euphonic character maybe? By the way, the crossover has some huge traditional copper coils on it so they are not afraid of taking up space.
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