Is the three-action earphone just one turn more than the double-action earphone?

Three-moving coil is indeed one more moving coil unit than double-moving coil, but it is definitely not just one more moving coil unit.

The most important thing is the need for frequency division technology. Many brands of headphones in the cottage directly stack two units for you, also called double-acting coils. The double-acting coil is developed by JVC, and the model is FXT90. It has been recognized by enthusiasts and earphone circles, which is its unique frequency division technology, and the three-action coil has higher requirements for frequency division technology.

The three moving coils of JVC are divided by nanocrystalline and physical bass divider. Only with these unique frequency division technologies, JVC's FXZ 100 FXZ200 won the highest honor annual industrial technology award in the headset industry. Therefore, although there is an extra moving coil on the surface, it is definitely not just an extra moving coil.

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If the multi-unit moving iron is reliable, then the multi-unit moving coil is somewhat puzzling. Earplugs are so big that the moving coil unit itself is not small. The result of blocking one more unit can only be a small unit. You need to know that the position that can accommodate a 10mm moving coil can definitely not accommodate two 5mm units (the moving coil is not square).

And two 5mm moving coils can spell 10mm 1 low frequency, which can only appear in jokes, because it is recognized that two 8-inch speakers can't catch up with one 10 inch low frequency on the speakers. However, the high frequency of a single moving coil unit is never a bottleneck. Of course, there seems to be no recognized good earphone for multi-unit moving coil, which also illustrates this point.