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Apple says the “dual-neodymium ring magnet motor” backing each driver is inspired by floor-standing speakers and is the reason you won’t hear any distortion even when the Max headphones are cranked to peak volume.

Instead of the usual solid disc, RHA uses a ring magnet and puts two voice coils around it — hence the DualCoil branding — with the inner one handling the lower range of frequencies and the outer addressing the higher end.

The same ring magnet sits on the left side, which is used for selecting menu items.

Among them was one in which he attached to his oscillator a ring magnet with a small air gap between the poles.

A copper disc, when inserted within the air gap of the ring magnet, was brought into rapid rotation.