Beyerdynamic T70 + Fiio X3 II

Closed-Back Circumaural Headphones and Portable High Resolution Lossless Music Player

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Premium Technology: Beyerdynamic T70 Tesla Headphones

Beyerdynamic T70 Tesla

Tesla technology defines beyerdynamic's unique T70 and T70p premium headphones. With the added power handling and volume the all-metal neodymium drivers of the T70 and T70p reproduce tones throughout an expansive frequency range with remarkable clarity and fidelity. A closed back design creates a private experience that nearly eliminates external sound. Regardless of volume level or power-output of the source, the T70 and T70p can produce the most defined and textured voices.

Beyerdynamic T70 Tesla

High quality velour-lined earpads and headband not only provide users with maximum comfort, the complete the streamlined and modern appearance of the T70 and T70p. Although the T70 is specifically engineered for high-powered use, the T70p is designed to meet the needs of audiophiles on-the-run.

The Fiio X3-II Portable High Resolution Lossless Music Player Offers an Incredible Listening Experience
The Fiio X3-II Portable High Resolution Lossless Music Player Offers an Incredible Listening Experience
The Fiio X3-II Portable High Resolution Lossless Music Player Offers an Incredible Listening Experience
The Fiio X3-II Portable High Resolution Lossless Music Player Offers an Incredible Listening Experience
The Fiio X3-II Portable High Resolution Lossless Music Player Offers an Incredible Listening Experience
The Fiio X3-II Portable High Resolution Lossless Music Player Offers an Incredible Listening Experience
The Fiio X3-II Portable High Resolution Lossless Music Player Offers an Incredible Listening Experience
The Fiio X3-II Portable High Resolution Lossless Music Player Offers an Incredible Listening Experience
The Fiio X3-II Portable High Resolution Lossless Music Player Offers an Incredible Listening Experience
The Fiio X3-II Portable High Resolution Lossless Music Player Offers an Incredible Listening Experience
The Fiio X3-II Portable High Resolution Lossless Music Player Offers an Incredible Listening Experience

Beyerdynamic T70 Tesla

Closed-Back Circumaural Headphones with Tesla Technology for Power and Volume Efficiency
Quantity: 1

Product Features

  • Closed-back, enclosed-ear headphones
  • Micro velour earpads and headband for maximum comfort and sound isolation
  • Neodymium drivers constructed in full metal
  • Broad frequency range for a wide range of tones
  • Specifically designed for home and home theater use
  • Single sided cable for reduced cable clutter and increased portability
  • Also available for portable use T70p
  • Authorized Internet Dealer
  • 2-Year Manufacturer's Warranty

Technical Specifications

  • Dynamic neodymium drivers
  • Closed back for sound isolation
  • Frequency range: 5Hz - 40,000Hz
  • Impedance: 250 Ohms
  • Sensitivity: 104 dB
  • THD: <0.05%
  • Power handling capacity: 200 mW
  • Cable length and type: 9ft. and 10-1/9in., single sided
  • 1/8" (3.5mm) gold vaporized mini stereo jack and 1/4" (6.35mm) adapter
  • Part Number: 714356

Fiio X3-II

Portable High Resolution Lossless Music Player
Quantity: 1


General Features:

  • Second generation portable digital audio player
  • High resolution lossless music player
  • Dual crystal oscillators dedicated to 44.1 and 48 kHz respectively
    • Ensures the lowest jitter and highest precision for music playback at all sample rates
    • Eliminates all conversion artifacts
  • All new digital audio architecture features native DSD support
  • Supported Formats: DSD, APE, FLAC, ALAC, WAV, AIFF, WMA, AAC, OGG, MP3, MP2
  • Audiophile-grade architecture and components
  • High quality 2" display
  • 10 band equalizer
  • Utilizes Cirrus Logic's high-end CS4398 DAC
  • Custom tuned low-pass filter
  • Extremely low noise and phase distortion
  • Premium tantalum capacitors in the analog circuit
    • Produces minimal internal resistance for the best uncolored sound possible
  • USB DAC function supports up to 192 kHZ/24bit audio
    • Plug-n-Play on Macs
    • +ASIO driver installation required for windows computers
  • Standard 3.5mm headphone output and composite coaxial/line-out port for use with external amplifiers/DACs
  • Standard micro USB 2.0 port for charging and data tranfer
  • Micro SD card slot supports up to 128GB card
    • 128GB card holds approximately 3200 lossless songs of various formats
  • Custom UI design with classic scroll wheel operation
  • Supports CTIA standard in-line remotes on select earphones
  • New power management features
    • Hibernation mode for instant-on playback
    • Coulomb meter integrated in battery provides accurate battery readings
  • Intuitive on-board controls allow for easy operation even from your pocket
  • All metal chassis
  • Internal 2600 mAh 3.7V Lithium-polymer battery provides up to 10 hours of playback
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty

What's in the Box?

  • Fiio X3-II Portable High Resolution Lossless Music Player
  • Micro USB Charging/Data Cable
  • 3.5mm Coaxial S/PDIF Adapter
  • Silicone Case
  • Screen Protectors (x2, one applied in-factory)
  • User Guide

Headphone Design

Headphone Type

This is the design of the earpieces on the headphones. Some headphones go inside the ear, while others rest on the outside of the ear. This helps you know exactly what type of headphones you will be receiving.

In-Ear: The ear buds go into the ear. Most often, the right and left ear buds are two separate pieces.

Enclosed-Ear: Usually are found on the larger headphones. They rest on top of the ear and have padding for comfort, as well as enclosing the ear to the speaker. This type of headphone helps to filter out surrounding noise.

On-Ear: This type of headphone involves the speaker sitting gently on the ear without going in the ear or sealing it off.

Headband Type

Headphone type refers to the construction of the headphones.

Around the Ear means that the headphones wrap around the ear to provide a secure fit. This is most often seen in active and sports headphones.

Around the Neck means that the headphones wrap around the neck. This is also seen in active and sports headphones.

Earbuds means that the right and left sides of the headphones are separated and will fit securely into the ear. These are small, compact, and user friendly.

Over the Head headphones mean that the right and left speakers are connected with a support that goes over the head and rests on top. This is the typical headphone type.

Over the Head
Specifically For
Some headphones can use an IR Transmitter in your vehicle, while some can be plugged into your media device and be used on the go or at home.
Headphone Application

This is the application that the headphones are designed for. Each application has unique features that make it perfect for particular uses.

DJ: These headphones are durable, loud, and will often allow for one ear listening.

Gaming Delivers explosive sound and allows you to communicate with others.

Home Hi-Fi: These audiophile headphones are engineered to produce high fidelity and accurate audio.

Home/Office: These headphones are designed to produce rich, brilliant sounds that the artists would appreciate.

Sports: Designed for active use. These headphones are made to stay in (or on) the ear during workouts.

Kids: Feature noise limiting technology so that your little ones don't damage their ears listening to music too loud.

On-the-Go: On-the-go headphones are lightweight and often fold up for easy storage and portability.

Student: Compact and rugged enough to survive life in a backpack; inexpensive enough to not hurt the wallet of a student.

Studio: Reproduce music perfectly without any coloration. Look here for reference quality studio monitoring headphones.

Traveler/Airplane: These headphones are compact, lightweight, and have a portable design.

Home Hi-Fi
Acoustic Principle

The basic design of the headphones. There are 3 different types:

Open: Have ports that allow air through the back of the diaphragms, enabling the headphones to sound like the music is coming from an outside source.

Closed: Completely sealed and have no air passing through the diaphragms. Sounds like you are in a closed off room.

Semi-open: Have slots or ports in the back of the cup and are partially open. This allows for a mixed sound between an open and closed headphone.


General Features

Noise Reduction technology removes unwanted noise from a signal. Background or ambient noise can be removed to produce clearer speech and enhanced hearing. Typically these Active Noise Canceling (ANC) headphones are powered and use batteries to activate the noise canceling technology. Also referred to as Noise Reduction or Noise Cancellation.
Built-In Microphone
This means that the headphones or earbuds have a built-in microphone. This can be a microphone on the cord, built into the headphone, or even a boom microphone. These mics can be used for music devices like iPods, for Smartphones to make and receive calls, or for gaming purposes.
Headphone Connection
This is how the headphones connect to the audio source.

Corded means that the headphones use a cord to transfer the audio signal.

Bluetooth means that the audio signal is transmitted from your device to the headphones via a Bluetooth connection.

Corded or Bluetooth means that the headphones can be used as corded headphones or as Bluetooth headphones. They have an input in one or both earcups for use as a corded headphone while they also have a built-in battery for use as Bluetooth wireless headphones.

Wireless means that the audio signal is transmitted wirelessly to the headphones.

Volume Adjustment
Volume Adjustment means that the headphone (independent of the source) can adjust the playback volume. Many headphones and ear buds have in-line volume control, which allows adjusting the audible volume from a switch on the headphones cord. Other headphones have a volume knob on the headphone can.
Connector Type
The type of connection the headphones use to connect to receive the audio signal from a music source. Traditional headphones use an analog 3.5mm headphone jack. Newer technology has allowed digital signals to be sent directly to the headphone using an Apple Lightning or USB-C cable.
Jack Size
Refers to whether the headphones use a 3.5mm or 1/4" headphone jack connection.
Jack Angle

The Jack Angle refers to the angle of the input jack on the headphone cable.

Straight Jack: Straight plug with no angle.

Angled Jack: Angled plug, usually a 90 degree angle.

Swivel Jack: A swivel jack is able to swivel between a straight plug and an angled plug.

Angled Jack
Included Adapters
Refers to the connection adapters included with the headphones like 3.5mm or 1/4" input adapter as well as airplane adapters that let you use your headphones with airplane specific headphone jacks.
1/4" Adapter
Color Shades
Primary color shades of the headphones.
Refers to materials used to build the headphones. Most headphones are built from some combination of plastic and metal to give you a durable pair of headphones.
Ear Cushion/Earbud Material
Refers to the material that the ear cushions/earbuds are made from. Ear cushions and earbuds are available in a variety of materials, ranging from basic rubber eartips to plush leather ear cushions intended for maximum comfort.
Water Resistant
This refers to the level of water resistance of the fitness tracker. Some fitness trackers are water resistant and can be used while swimming, while others are only splash proof or should not be used near the water.
Refers to whether a pair of headphones can be folded up. These headphones feature hinges in the frame above the earcups that allow the headphones to neatly fold into a much more manageable size. Folding headphones are perfect for anyone who spends a lot of time traveling and needs a compact pair of headphones that can fit in their bags.

Audio Features

Driver Type

The physical design of the driver in the headphones.

Balanced Armature:
A balanced armature driver uses a coil wrapped around an armature which is held in between two magnets until it is stimulated by an electrical current. When stimulated, this armature is magnetized which causes it to rotate one way or the other around a pivot point which moves the diaphragm to create sound. Balanced armature driver headphones are generally earbuds and can have multiple drivers in each earbud.

Dynamic drivers are the most common driver type. They feature a permanent magnet, usually neodymium, a voice coil and a conical diaphragm to drive your music. A dynamic headphone driver looks pretty much identical to any typical home theater speaker.

Electrostatic drivers are made up of an extremely thin membrane, usually a coated PET film, stretched between two metal plates. An electrical signal is applied to the metal plates to create an electrical field which, depending on its polarity, draws the speaker diaphragm toward one of the plates which forces air through the perforations in the diaphragm which generates the sound wave.

Planar Magnetic:
A planar magnetic driver is made up of a large membrane suspended between two sets of oppositely aligned magnets. An electric charge is applied to the membrane to induce movement and produce sound waves.

The opposition to electric current, a higher impedance means a higher electrical resistance. This is measured in ohms.
250 ohms
An efficiency or sensitivity rating tells you how effectively a speaker converts power into sound. The higher the number, the more efficient the speaker and the louder it will play with the same input power. An efficient speaker helps you maximize your available power. Most sensitivity ratings measure the speaker's output with 1 watt of input, 1 meter from the speaker. Some speakers' sensitivity is measured with 2.83 volts of input, instead of 1 watt.
Efficiency (1w/1m) is not an accurate indicator of a subwoofer's output capability and should not be used as a comparison to other speakers or subwoofers to determine which one is "louder".
104 dB
Frequency Response
The range of frequencies the speaker will reproduce (lowest frequency to the highest). Bigger is better, meaning the wider the range, the better. The optimal range is 20 - 20,000 Hz (which is the range of human hearing).
5 - 40000 Hz
Audiophile headphones represent some of the finest headphones available. Audiophile headphones produce genuinely outstanding sound quality as well as extraordinary build quality, components and comfort. They are truly the finest headphones available.
Built-in Amplifier
This refers to whether the headphones have an amplifier built-in.
Amplifier Recommended
This refers to whether a separate headphone amplifier is recommended for use with a specific pair of headphones. It is highly recommended that any headphone with an impedance greater than 100 ohms be amplified.
Yes (Accessory Recommended)

What is in the Box?

Main Product
The main product in the box.
Beyerdynamic T70 Tesla Headphones
Accessories included with the headphones
1/4" Adapter
Paperwork included with the product.
User manual
Warranty/Registration card

Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider

Summary of Customer Ratings & Reviews

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Product Summary


Model Number

T70 & X3ii



Internal SKU


Internal Product ID


Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Beyerdynamic T70 + Fiio X3 II

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Beyerdynamic T70 + Fiio X3 II

Closed-Back Circumaural Headphones and Portable High Resolution Lossless Music Player


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