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  • Electrostatic transducers deliver clean bass and unmatched sound quality
  • Pivoting ear cups and an adjustable/detachable headband ensure ultimate comfort and convenience
  • Covered under the Koss Stereophones Limited Lifetime Warranty
ESP/950 Headphones

Frequency Response

8-35,000 Hz


100k ohms

Sound Pressure Level

98 dB SPL/1mW

Cable Straight, Dual Entry, 4ft
Cup size, including cushions (HxWxD) 5.9 x 3.9 x 1.6 in (15 x 10 x 4 cm)
Diaphragm radiating surface area 7 sq in (45.6 sq cm)
E/90 Energizer
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)
  • Koss ESP950 Electrostatic Headphone
  • Energizer
  • Battery pack
  • Leather carrying case
  • Connecting cables
  • 120 VAC adapter

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