{"product_id":"es-lab-es-he90-electrostatic-headphones","title":"ES Lab ES-HE90 Electrostatic Headphones","description":"\u003cp\u003e\u003cem\u003e\u003cspan\u003eNote: Pre-orders open November 6 at 8 a.m. PT. The limited first batch ships by the end of January 2027; orders allocated to the second batch are expected to ship in March 2027. All pre-orders before Jan 31, 2027 will include an extra set of earpads for alternate tuning. Allow 2–3 weeks for delivery after shipment.\u003c\/span\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003ch1\u003e\u003cstrong\u003eA tribute to a classic electrostatic design\u003c\/strong\u003e\u003c\/h1\u003e\n\u003cp\u003eThe ES Lab ES-HE90 is an open-back electrostatic headphone developed as a tribute to the legendary Sennheiser HE90. It combines precision-machined glass electrodes, an ultra-thin elliptical diaphragm, and bubinga wood housings with a modular construction that makes the cable, headband, and earpads replaceable by hand. \u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eGlass electrodes with micron-level accuracy\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe ES-HE90 uses high-strength glass as the foundation for its electrostatic driver electrodes. Glass resists warping during processing, helping preserve the electrode geometry. High-precision laser cutting and chemical etching form approximately 5,000 hexagonal holes with micron-level accuracy while maintaining the substrate’s structural integrity.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eGold-coated conductive surfaces\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eEach glass electrode receives a sputtered chromium layer followed by a pure gold coating. These layers provide electrical conductivity and resistance to oxidation, helping maintain electrode stability over time.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eUltra-thin elliptical diaphragm\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe engineering-plastic diaphragm measures approximately 0.000039 inches (1 micron) thick. ES Lab designed it to reproduce fine detail and spatial information, with an elliptical shape intended to reduce standing waves compared with a traditional circular diaphragm.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eClean-room driver assembly\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eES Lab assembles the drivers entirely in a clean-room environment. After multiple cleaning procedures, a technician inspects every opening across all four electrodes for particle contamination. This attention to cleanliness helps preserve the precision of the finished driver assembly.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eBubinga wood housings\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe housings use bubinga wood sourced from Africa and selected after testing different woods for their resonant characteristics. Each housing passes through multiple stages of sanding, finishing, coating, and polishing to bring out the wood’s natural grain.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eEarpads that shape the tuning\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eHand-assembled polyurethane foam earpads balance density, firmness, and breathability. Different earpad combinations let listeners choose a tuning intended to closely recreate the original HE90 sound signature or an alternative developed for modern recordings.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eReplaceable parts for long-term ownership\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe ES-HE90 weighs approximately 13.1 ounces (370 grams) without its cable. Its modular construction lets you remove and replace the earpads, headband, and cable by hand, making routine maintenance and customization straightforward.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eA wooden case for storage\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eAn included wooden case protects the headphones during storage and transport. The detachable cable measures approximately 7.5 feet (2.3 meters), providing reach between your listening chair and electrostatic amplifier.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eProduct highlights\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOpen-back electrostatic headphones inspired by the classic HE90\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eHigh-strength glass electrodes with precision-cut hexagonal openings\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eChromium conductive layer with a pure gold coating\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eUltra-thin elliptical diaphragm\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eBubinga wood housings\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eHand-assembled polyurethane foam earpads\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eReplaceable earpads, headband, and cable\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e5-pin Stax-type Pro Bias termination\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eWooden storage case included\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eMade in Hong Kong\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eSpecs\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBrand: ES Lab\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eModel: ES-HE90\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eTransducer type: Electrostatic\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eAcoustic design: Open-back\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eFrequency response: 20–41,000Hz\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eSensitivity: 100dB at 100V RMS\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eBias voltage: 500–580V DC\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eTermination: 5-pin Stax-type Pro Bias\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eDiaphragm material: Engineering plastic\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eDiaphragm thickness: Approximately 0.000039 inches (1 micron)\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eElectrode substrate: High-strength glass\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eElectrode coatings: Chromium and pure gold\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eHousing material: Bubinga wood\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eEarpad foam: Polyurethane\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCable length: Approximately 7.5 feet (2.3 meters)\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eWeight without cable: Approximately 13.1 ounces (370 grams)\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eOperating temperature: 32–95°F (0–35°C)\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eOperating humidity: 0–90%\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eWarranty: 1 year\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCountry of manufacture: Hong Kong\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eWhat’s included\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eES Lab ES-HE90 electrostatic headphones\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eDetachable cable with 5-pin Stax-type Pro Bias termination\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eWooden storage case\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ES Lab","offers":[{"title":"Default Title","offer_id":68069709119724,"sku":"APS-1479-1","price":6000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0225\/2721\/3642\/files\/APOS_ES_HE90_Right_Side.jpg?v=1793830314","url":"https:\/\/apos.audio\/products\/es-lab-es-he90-electrostatic-headphones","provider":"Apos","version":"1.0","type":"link"}