Sennheiser Orpheus HE 90 headphones Specifications

Sidebar 2: Specifications

Sennheiser Orpheus HE 90 headphones: Open-back, diffuse-field compensated. Transducer principle: electrostatic, push-pull. Frequency response: 25Hz–75kHz, –3dB. Distortion: <0.01% at 94dB, <0.1% at 110dB. Maximum sound pressure level: 118dB. Bias voltage: 500VDC.
Weight (excluding cable): 12.9oz (365gm). Orpheus HEV 90 amplifier: Tube headphone amplifier (not available separately) with on-board D/A processor. Frequency response: 10Hz–20kHz, –0.25dB. Distortion (1kHz): <0.01%. Input sensitivity: 400mV. Input impedance: 10k ohms. S/N ratio (unweighted): !w80dB. Crosstalk (1kHz): >80dB. Output voltage: 400Vrms. Inputs (switchable): digital coaxial (S/PDIF) and optical TosLink, analog RCA. Serial number of sample tested: 0102 (HEV 90) (none, HE 90).
Dimensions: 15" (380mm) W by 6.1" (155mm) H by 13.4" (340mm) D. Weight: 28.6 lbs (13kg).

Common to both: Price (HE 90 with HEV 90): $12,900; an additional HE 90 headset costs $6500 (1995); no longer available but much sought after (2010). Approximate number of dealers: factory-direct only.
Manufacturer: Sennheiser Electronic GmbH & Co. KG, Am Labor 1, 30900 Wedemark, Germany. Tel: (49) 5130-600-0. Fax: (49) 5130-600-300. Web: US distributor: Sennheiser USA, 1 Enterprise Drive, Old Lyme, CT 06371. Tel: (860) 434-9190. Fax: (860) 434-1759. Web:

Sennheiser Electronic
US distributor: Sennheiser USA
1 Enterprise Drive
Old Lyme, CT 06371
(860) 434-9190