Sennheiser HE90

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Sennheiser Orpheus: HE90 headphone and HEV90 tube amplifier
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Sennheiser Orpheus: HE90 headphone and HEV90 tube amplifier

Contents


Orpheus System: HE90 headphone and HEV90 amplifier

The Orpheus system was Sennheiser attempt to show that they can make true audiophile headphone system that was able to compete, and beat, the best headphone that Stax was offering at the time. Sennheiser positioned this system as: "the ultimate in reference sound reproduction".


The key features of the system were: 1 µm diaphragm that was gold-plated using vapour technique, electrodes made from special glass, diffuse field equalized frequency range, HEV90 valve (vacuum tube) amplifier with all valve analogue signal path and on-board dedicated bitstream digital to analogue converter.


General Description of the Sound

Many believe HE90 is the all time king of headphones and the ultimate in sound reproduction. However there are a lot of people who disagree with this statement and feel that HE90 has many shortcomings such as defused soundstage, low bass impact, overly euphonic presentation, and ultimately is overpriced. General agreement though is that HE90 is one of the top echelon headphones and is one of the very best.

Sennheiser Orpheus: HE90 headphone
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Sennheiser Orpheus: HE90 headphone

Pricing & Other Data of Interest

HE90 headphone and HEV90 amplifier, Japanese brochure
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HE90 headphone and HEV90 amplifier, Japanese brochure
Sennheiser Orpheus: HE90 headphone and HEV90 tube amplifier
Enlarge
Sennheiser Orpheus: HE90 headphone and HEV90 tube amplifier

Technical Specifications:


Specifications for the Sennheiser Orpheus HE-90 Headphones:

Frequency response: 7-100,000 Hz (-10 dB); 14-85,000 Hz (- 6 dB); 25-75,000 Hz (- 3 dB)

Frequency range: diffuse field equalized

Transducer principle: electrostatic

Ear coupling: circumaural

Contact pressure: 4.6 N

THD at SPL of 110 dB (94 dB) < 0.1 % (< 0.01 %)

Nominal sensitivity: (V = 100 V) ≥ 98 dB/1 kHz

Polarisation voltage: 500 V

Weight (without cable): 365 g

Connector: 5-pin HV plug

Connection cable: 3 m, 6-core; OFC copper cable with gold-plated contacts

Dimensions: 19 x 10 x 21.5 cm


Specifications for the Sennheiser Orpheus HEV-90 Amplifier

Frequency response: 10 - 20,000 Hz (- 0.25 dB)

THD (1 kHz) < 0.01 %

Unweighted S/N ratio ≥ 80 dB

Sensitivity/impedance: 10 kΩ

Talk-over muting: (1 kHz) ≥ 80 dB

Output voltage :400 Veff

Line inputs:

  • (switchable) optical, digital (Toslink)
  • co-axial, digital (RCA phono)(automatic recognition of incoming sampling frequency)
  • co-axial, analogue(RCA phono)

Outputs for 2 HE 90 headphones

Weight approximately: 13 kg

Dimensions: 53 x 34 x 15.5 cm

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