Sennheiser HD 800 S + Eternal Arts OTL Basic Line

Sennheiser Dynamic Stereo Headphones together with the Tube Headphone Amplifier OTL by Eternal Arts
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Sennheiser HD 800 S

The striking industrial design combines form and function seamlessly, the layered metal and plastic headband construction attenuating vibrations to the earcups while the handmade microfiber earpads offer exceptional comfort for even long periods of listening enjoyment.

Crafted for perfection, the HD 800 and the HD 800 S are precision-built in Germany from only the finest materials and components. The transducer is encased by stainless steel, while the headband and headphone mounting utilises the most advanced materials developed in the aerospace industry for high strength with minimal weight.

The new HD 800 S offers even better high precision connectivity options and is now supplied with two connection leads, a 6.3mm connector and a XLR-4 balanced cable to offer even better quality sound from sources with balanced outputs such as the Sennheiser HDVD 800 headphones amplifier.

Absorber technology of the HD 800 S
The enhanced sound reproduction of the HD 800 S is achieved through the addition of the innovative absorber technology that was pioneered in the Sennheiser IE 800 – a breakthrough that preserved the audibility of very high frequency sounds by eliminating a phenomenon known as the “masking effect”, where the human hear struggles to hear frequencies of sound when lower frequencies of a higher volume occur at the same time. By absorbing the energy of the resonance, Sennheiser’s patented absorber technology prevents any unwanted peaks and allows all frequency components – even the finest nuances – in the music material to become audible. This innovation was a key element in making the IE 800 the world’s best sounding in ear headphone, and in the HD 800 S it helps to bring even greater purity and precision.

Such enhancements build on the formidable achievements of the classic, with the 56mm sound transducer – the largest ever used in dynamic headphones. The unique ear cup design directs sound waves to the ear at a slight angle to create an impressively natural and spatial listening experience.

While much appears the same, the enhanced performance within is revealed by a distinctive new look, with the silver finish of the 2009 classic HD 800 making way for high-class matt black for the HD 800 S. 


  • Further optimised reference class in wired headphones
  • Open, circum-aural dynamic stereo headphones
  • Enhanced sound reproduction achieved through absorber technology
  • Additional cable with balanced XLR4 connector
  • High-class matt black metal parts
  • Natural hearing experience - realistic and natural sound field with minimal resonance
  • Biggest transducers ever used in headphones including new innovative dynamic transducer design
  • Uncovered earcups for enhanced acoustics
  • Handcrafted ear pads, made of high-quality microfiber fabric
  • Metal headband with an inner damping element
  • Specially tuned balanced, impedance matching cable with low capacitance
  • Special high precision headphone connectors
  • 2 year warranty


EternalArts OTL Basic Line 

The EternalArts Headphone amplifier applies the genius of the Futterman concept to an amplifier for superior headphones.

Compact amplifier unit with connection for two high impedance premium headphones housed in a two piece powder coated steel and aluminium case with a high gloss acrylic front plate, sorbothane feet and full metal nickel plated volume control knob.

  • Developed and optimised with the Sennheiser HD 800 high end headphone
  • Circuit with 2 tubes: 2 triode-pentodes PCL86
  • Designed with 70µ dual-sided gold-plated circuit boards
  • High grade TRANSTEC multi voltage transformer in toroidal design with permalloy shielding
  • Superior selected components, blue ALPS poti, gold-plated headphone connectors and high grade Neutrik cinch sockets
  • Multiple protected, perfectly stable circuitry for ultimate safety and high tube life cycle
  • Phenomenal frequency range and impulse response
  • Entirely made in Germany

Circuit Description
The signal is transferred to the screen of the triode via a potentiometer. The triode’s cathode has a RC element with adjustable R in order to vary the amplification of the triode. The anode controls via a RC element the control screen of the pentode. A low inner resistance is reached as a result of the cathode follower.

The signal is decoupled at the cathode and the direct current elements are eliminated using a capacitor. Signal is then transferred to the headphones along a fuse and two Z-diodes acting as voltage protection.

The speciality of the circuit is a stabilizing tube that maintains a constant plate voltage of the triode independent of the amplification The latter is direct current heated via a RC element and double buffering. In addition, the shield is supplied by a RC-filter. Goal was to achieve a hum free headphone amplifier. New Old Stock valves from Siemens are used. To prove their selected quality they carry the EternalArts logo.


Daniel Dimitrov

We have a comprehensive selection of Sennheiser devices available for demonstration in our studios in Berlin-Kreuzberg. We look forward to your visit!

Sennheiser HD 800S
Color black
Cable length 3m
Contact pressure ~ 3,4 N (± 0,3 N)
Ear coupling Circumaural
Frequency response 6 - 51,000 Hz (-10 dB)
Impedance 300 Ω
Jack plug 6.3mm / XLR
THD, total harmonic distortion 0.02 % (1 kHz 1 Vrms)
Transducer principle Dynamic Open
Wearing style Headband
Weight w/o cable 330 g
Audio-XLR connector XLR4


Eternal Arts OTL Basic Line

Description Power switch, 2 pole
LED for power on
Unbalanced signal input (gold- plated Neutrik cinch sockets)
Gold- plated stereo jacks for headphones connection
Tubes Tube complement: 14GW8 / PCL86 each channel
General Specifications Dimensions: 13.5 (W) x 11 (H) x 33.5 cm (D)
Weight: 2.8 kg net
Ambient temperature usage: 10 to 35° C
Ambient humidity usage: 20 to 80%
Technical Specifications Input impedance: 10 K ohm
Headphone Impedance: 300 / > 20 ohms; switchable
Frequency Range (- 3 dB): 10 - 375.000 Hz
Signal-to-noise (related to 1V): 80 dB
THD (1 KHz, 400 mVs, 300 ohms): < 0.4%
Idle run stability: Permanent
Short circuit stability: Short period


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