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HeadphonesOver-Ear HeadphonesDiscontinued
Estimated price (community-sourced)
$350
Around — community and catalog average, updates slowly
About the ESP/95X
The Massdrop x Koss ESP/95X is an open-back, circumaural electrostatic headphone system developed as a custom version of Koss’s ESP/950. It includes the E/90X electrostatic energizer, which is required to operate the headphones, along with an AC adapter and connection cables. The headphones use a 1.5-micron semiconductive-coated polyester diaphragm and velour-wrapped foam cushions.
Specifications
Headphone type: Circumaural, open-air electrostatic; Diaphragm: 1.5-micron semiconductive-coated C-grade polyester film; Radiating surface area: 7 sq in (45.6 cm²); Frequency response: 8 Hz–35 kHz; Bias voltage: 600 V; Cushions: Velour-wrapped foam; Cable: 4 ft (1.2 m) straight dual-entry cable, with 6 ft (1.8 m) extension; Headphone weight: 12.45 oz (353 g). Included E/90X energizer: 1.6 Hz–50 kHz frequency response (-3 dB); 100 kΩ input impedance; 790 Vrms differential output; RCA and 3.5 mm inputs.