For that matter, ditto the same question for voice coils. Nickel is used on some trafos (more magnetic?) and connectors and sometimes power line wire, why not a voice coil? I suppose the mass is a deterrent but maybe it could have a positive effect if damped differently. Have heard of silver and gold used in coils before, though they are more conductive...
From my perspective, heat and bandwidth are already not issues for most 50mm electrodynamic headphone drivers (at least those with flexing suspensions), so perhaps more mass for earlier rolloff could even be desirable from a subjective standpoint. Perhaps a stronger motor could be a workaround for a heavier coil too.
Of course this is all purely speculative and I understand why from an on paper standpoint copper (or CCAW) is the closest to an ideal conductor for a voice coil, and Be has great material properties for a diaphragm. But I have to wonder if there's anyone out there experimenting
Light and strong seem to be most important criteria for drivers. You can of course make something with no flex out of steel but the weight would hinder free movement needed to push air.
All those materials mentioned seem to have the best strength/weight ratio
Just was going to say HarmonicDyne Poseidon is using nickel coated(?) drivers and I saw the replies. And, if you want to check some weird Chinese stuff, do ask me, though I'm not following the trend now, but local market always has something new pop up
Voice coils generate magnetic fields which is directly due to the current. This means you want as low a resistance possible. So coils are made from aluminum, copper and even silver. Nickel is used for magnetic lamentations but don’t conduct any current. I don’t think you would really see it used for transducers unless it’s a field coil
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