The Pinnacle of Audio Reproduction

Featuring remarkable power and unmatched sound quality.

Key Features:

ESP/95X


• Electrostatic transducers deliver clean bass and unmatched sound quality
• Pivoting ear cups and an adjustable/detachable headband ensure ultimate comfort and convenience
• Straight, dual-entry 4 foot cord with 6 foot extension
• Includes energizer, battery pack, leather carrying case, connecting cables and 120 VAC adapter
• Diaphragm radiating surface area: 7 sq in (45.6 sq cm)
• Cup size, including cushions (H x W x D): 5.9 x 3.9 x 1.6 in (15 x 10 x 4 cm)
• Cable: Straight, dual entry, 4 ft (1.2 m) with 6 ft (1.8 m) extension
• Covered under the Koss Stereophones Limited Lifetime Warranty


E/90x


• Frequency response: 1.6 Hz–50 kHz (-3 dB), 100 Vrms differential output)
• THD + N: 0.001% at 1 kHz, 100 Vrms differential output
• Input impedance: 100 kohms
• Input level: 1 Vpk (for full power output)
• Voltage amplification: 60 dB, Audio output voltage: 790 Vrms differential; 2,200 Vpk-pk differential with soft limiting
• Channel separation: -80 dB at 1 kHz, 100 Vrms differential output
• Dimensions (H x W x D): 2.6 x 4.3 x 6.1 in (6.5 x 11 x 15.5 cm)