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T 51 i

T 51 i

Made in Germany
Excl. tax, Excl. shipping
Article Number: 715603
Delivery time: 3-4 days

Portable Tesla Hi-Fi headset with Apple-certified smartphone remote and mic, closed

Also available without smartphone remote - T 51 p >>

Compact Tesla sound

Like its sibling T 51 p, the focus for design of the T 51 i is delivering unrivalled sound quality. With new and improved drivers the headphones deliver in an inspiring way – right from the first moment. A particularly deep bass response and transparent, clear highs are apparent from the T 51 i due to the common properties that make all Tesla headphones so special: high efficiency and low distortion. The result: a clear, powerful sound across the entire frequency range, even at low levels. The closed design of the T 51 p also isolates external noise very effectively.
Further information about Tesla Technology Completely re-engineered transducers (drivers) based on a neodymium ring magnet with optimized magnetic field characteristics. This combination creates a magnetic field inside the transducer which is far stronger (> 1,2 Tesla - measuring unit for magnetic flux density - with current headphones the strength of the magnetic field is < 0,65 Tesla) than in standard headphones. Because of this increased magnetic field, the voice coil is more compact but still provides a very high degree of efficiency. The membrane, consisting of a 3 layer "compound foil", delivers an extremely precise frequency response and guarantees, in collaboration with the strong magnet, a transparent and distortion free sound..

Works on your iPhone and other mobile devices

Being an officially licenced product, you can be sure, that the T 51 i works smoothly on your iPod, iPhone or iPad. With the three-button remote and mic, you can use your T 51 i to control calls and media playback. All functions (except the volume up and down) work on other current smartphones and tablet computers as well, including Windows and Android devices.

High quality and elegant looks

The shiny beyerdynamic logo on the housing caps stands in sharp contrast with the brushed metal surfaces of the ear-cups. The cable has also been improved to be more stable and has a satin finish which results in less cable noise. A light champagne tone lends the headphones a very elegant appearance and raises the T 51 p above the plastic monotony of most – even more expensive – headphones with its all-metal construction.

Perfect to wear

With its metal fully-adjustable headband and swivelling earcups the T 51 i fits perfectly on your head and confirms beyerdynamic’s long-established reputation for producing headphones  with excellent wearing comfort. The ear pads made of super-soft synthetic leather fit the contour of the outer ear thanks to its viscoelastic filling (a memory foam).

Practical, even when traveling

Thanks to the swivelling earcups the T 51 i folds up compactly and fits in the included rugged nylon carry case. A high-quality 6.35 mm adapter is included for listening on premium hi-fi equipment or headphone amplifiers, an airplane adapter is also included so you can enjoy a superior experience of in-flight entertainment.

An Overview: Features of the T 51 i

  • With convenient 3-button remote control and microphone for phone calls and media playback (Apple compatible)
  • Outstanding balanced and powerful sound quality with brilliant treble and deep bass reproduction
  • Tesla technology with highest efficiency
  • Excellent ambient noise attenuation
  • Swivelling earcups 90°
  • Incl. rugged nylon carrying case
  • Incl. 1/4" jack adapter (6,35 mm)
  • Incl. in-flight adapter
  • Incl. adapter for non Apple compatible devices

Also available without smartphone remote - T 51 p >>

Add to Cart


Peter Carini
Sales Manager
Consumer Business Unit

beyerdynamic Inc. USA
56 Central Ave
Farmingdale, NY 11735

Office 631.293.3200 ext.17
Fax 631.293.3288
Mobile 516.848-3902

technical data

Transmission type   Wired
Headphone design (operating principle)   Closed
Headphone impedanceAlso known as nominal impedance. The impedance is the AC resistance of the coils of loudspeakers and headphones in ohms. Since impedance depends on the frequency, it is always specified at a frequency of one kilohertz.   32 ohms
Headphone frequency responseThe frequency response specifies the highest and lowest frequencies reproduced by the acoustic transducer of the headphones.   10 Hz - 23,000 Hz
Nominal sound pressure levelThe acoustical level, the headphone transducer produces to an artificial ear (a measurement device, which simulates a human ear) with an input power of 1 mW (dB/mW @ 500 Hz).   111 dB
ConstructionSound coupling to the ear. A differentiation is made between supraaural headphones, circumaural headphones and in-ear headphones.   Supraaural (on-ear)
Cable & plug   Stereo jack plug 3.5 mm (1/8") & ¼“ adapter (6.35 mm)
TRRS standard   CTIA (adapter cable for OMTP included)
Net weight without packaging   174 g

Spec Sheet

accessories for T 51 i

Adapter Skype VoIP
Adapter Skype VoIP

Adapter Skype VoIP for MMX series

Adapter Skype VoIP
EDT Cotton Ear Seals
EDT Cotton Ear Seals
Excl. tax, Excl. shipping
5 pairs ear covers, black, fit to all headsets
EDT Cotton Ear Seals


Spec Sheet

User Manual

For more downloads please refer to our Service section.
At present the best headphone 07/2014
Title: beyerdynamic T51i: testing a noble headphone
Author: Christoph de Leuw 07/2014
Title: beyerdynamic T51i: testing a noble headphone
Author: Christoph de Leuw

Translated from the original German article


The look of the beyerdynamic T51i is polarising: With its plain design it looks as if it was made with a metal building set, quite in contrast to the hip competitors with their colourful high gloss synthetic materials. Yokes, joints and headband make a very strong impression, the workmanship appears solid.


In fact: in the measuring lab of COMPUTER BILD the T51i accelerated considerably and was louder at the same input voltage than most of the competitors (...). In this way you can listen to the music without distortion even in loud surroundings, because you need not to increase the volume of the player. Fellow passengers feel less molested, because the beyerdynamic headphone does not let sound penetrate outwards. The proud owner may be happy about the very clean and balanced sound without any distortion. The beyerdynamic provides powerful and clean, a never exaggerated bass and clear treble. In comparison to competitors (...) there are more details audible with the T 51i and listening to the music is a lot of fun.


If it has to be the best sound when on the go, the beyerdyamic T51i is the choice. It sounds balanced and neutral, but does not neglect the bass. It also plays loud enough with weak smartphones and convinces with a high comfort of wearing. With a rating of 1.93 it is currently the best headphone that COMPUTER BILD tested.

Distinct impulses and power 05/2014
Title: High End 2014
Author: Mehmet Toprak 05/2014
Title: High End 2014
Author: Mehmet Toprak

Translated from the original German articles


This on-ear headphone provides a sound with distinct impulse, full of power and precision.  

A noble metallic appearance 05/2014
Title: Unboxing and short test of hi-fi headsets
Author: Klaus Reiter 05/2014
Title:  Unboxing and short test of hi-fi headsets
Author: Klaus Reiter

Translated from the original German article


Both headsets appear to be of a high quality, just as it can be expected for this price. The T51i with its noble metallic appearance and simple, yet modern design is most impressive.  

Did not promise too much 05/2013
Title: Tesla for the smartphone
Author: Michael Holzinger 05/2013
Title: Tesla for the smartphone
Author: Michael Holzinger

Translated from the original German article

One can state that beyerdynamic does not promise too much, because the new headphone actually sounds excellent, what can already be said before the official presentation.


The beyerdynamic T 50 p already is a great headphone when you are on the go, but it has been surpassed by its successor the beyerdynamic T 51 p. At last with the beyerdynamic T 51 i, a variant of the T 51 p, there is an on-ear headphone version available for smartphones.


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