The new D series loudspeaker adopts HiVi’s industry-leading Small/Thiele parameter optimization design technology. German PMK double-layer mica high-strength integrated diaphragm, German-made fatigue-resistant and high-loss natural rubber folding ring, high permeability and high stability centering support piece, HiVi patented dual magnetic circuit fully coupled symmetrical high-power composite magnetic circuit system (SMD) and high-performance neodymium iron boron magnets, high-power 75mm high temperature resistant copper-clad aluminum wire voice coil with no eddy current loss Kapton voice coil frame, finite element precision computer simulation design integrated high-density aluminum frame, long-stroke linear displacement Symmetrical low distortion drive magnetic field design.