Abstract: Planar-magnetic transducers and headphone speakers are provided. The transducer includes a magnet, a diaphragm and an electrically conductive trace. The magnet is formed from a continuous piece of magnetic material. The magnet includes a first surface and a second surface opposite the first surface. The magnet includes at least one slot extending through the magnet from the first surface to the second surface. The diaphragm is mechanically coupled to a frame and disposed at a predetermined distance from the first surface of the magnet via the frame. The trace is coupled to the diaphragm. The trace is arranged in a predetermined pattern and at a predetermined position relative to the at least one slot of the magnet.