Stormopen OpenAir II — Open-Back Over-Ear Planar Magnetic Wireless Headphones

The Stormopen OpenAir II Open-Back Over-Ear Planar Magnetic Wireless Headphones represent Stormopen’s most technically ambitious driver technology, applying planar magnetic transduction — the driver architecture previously limited to ultra-premium wired audiophile headphones above $500 — to a wireless platform accessible to a broader audience of serious music listeners. Planar magnetic drivers suspend a thin flat film diaphragm of 6-micron polyimide with a lithographically etched copper conductor trace in a uniform magnetic field generated by neodymium magnet arrays mounted on both sides of the diaphragm. The distributed force driving mechanism — the conductor trace covering 85 percent of the diaphragm surface versus the 5 percent contact area of a conventional voice coil — produces a piston-like motion with effectively zero partial modes across the full driver excursion range, eliminating the breakup distortion that degrades high-frequency reproduction in dynamic drivers at high output levels. Total harmonic distortion measures 0.05 percent at 100 dB SPL, among the lowest figures achievable in consumer headphone transducers. The planar magnetic driver presents a 25-ohm load to the amplifier but requires a voltage swing of 2.8 Vrms for full output, demanding a higher-current amplifier stage than standard 32-ohm dynamic drivers. Stormopen’s custom amplifier chip provides 3.2 Vrms maximum output from battery. LDAC and aptX Adaptive codec support maximizes wireless audio quality. The 1,200 mAh battery delivers 24 hours. Net weight is 340 g.