X5i High Fidelity


In-Ear Headphones


Equipped with our proprietary Core Array Technology™, patented Headphone Ecosystem™ and original 5-Driver hybrid configuration, the MAS X5i features audiophile grade Hi-Res Audio certified sound, innovative design and superior build quality.  

​5-Driver Hybrid Configuration

The MAS proprietary 5-Driver Hybrid Configuration is composed of quad Balanced Armature drivers and one specially tuned Dynamic driver to reproduce accurate and balanced sound. The X5i featuring high fidelity and extremely wide frequency response from 5Hz to 70,000Hz is Hi-Res Audio certified by the Japan Audio Society. 

Core Array Technology™

The Core Array Technology ™ integrates precision coaxial acoustic design with high end speaker sound-tuning technique to control the sound wave energy effectively, minimize distortion and produce spacious soundstage. 

The Patented MAS Headphone 


Create Infinite Possibility

MAS offers a range of accessory cables that are

interchangeable with all MAS headphones to provide a variety of special features for MAS headphones.


Inbox MAS XX cables

  • MAS XX Remote Cable: The MAS XX Remote Cable embedded MEMS microphone allows you to make calls and select tracks on your mobile devices.


  • MAS XX Audio Cable: The MAS XX Audio Cable allows you to link professional audio equipment such as media players or amplifiers with maximum audio fidelity.


​​Optional MAS XX cables

  • MAS XX Bluetooth Cable: The MAS XX Bluetooth Cable can turn MAS headphones into Bluetooth headsets when connected. The XX Bluetooth cable has a remote with microphone for making phone calls and select tracks. It lasts for 12 hours of listening time per single charge.


  • MAS XX USB-C Headphone Cable:  The MAS XX USB-C Headphone Cable has built-in high resolution DAC and 3D virtual surround processor. It connects to mobile devices’ USB-C port to stream digital music and surround sound for games and movies through the MAS headphones.

Detachable Cable Design

The X5i with detachable cable design through MMCX connectors allows you to upgrade or swap the headphone cables. You can even turn the X5i into a Bluetooth headset with the optional MAS XX Bluetooth Cable or turn the X5i into a 3D surround gaming headset with the optional MAS XX USB-C Headphone Cable.

XX Audio Cable for Professional Audio

The X5i comes with an audiophile grade silver-coated OFC cable to link your professional audio equipment such as media players and headphone amplifiers for optimum sound quality

XX Remote Cable for Mobile Devices

The X5i comes with a remote cable with inline microphone to allow you to make calls and select tracks on your mobile devices. A superior MEMS microphone delivers incredibly clear voice quality.

(Note: Please note that some mobile devices may not fully support the remote because of different Apps or operation systems.)

Premium Build Quality

The X5i uses presision CNC metal parts, leather texture, and anti-fingerprint surface treatment to feature premium build quality.

Ergonomic Design

Thanks to the compact 5-driver earbuds, a variety of antibacterial silicon eartips and memory foam earplugs, the X5i provides comfortable and steady fits even used for extended period. With the earbud magnet-clipping design, the X5i is easy to carry and perfect for travelling. 


Please connect and disconnect the MMCX

cables vertically to the jacks or earbuds.


Driver Unit - 10mm Dynamic + 4 Balanced Armatures

Impedance - 12Ω

Frequency Response - 5-70,000Hz

Sensitivity - 105db/mW(@1kHz)

Accessory Kit

  • A silver-coated OFC cable

  • A remote cable with MEMS microphone

  • Four sets of anti-bacteria silicon ear tips(S/M/M/L)

  • Three sets of memory foam ear tips(S/M/L)

  • ​Three pairs of MAS XX Earwings(S/M/L)

  • A soft carrying pouch

  • A product warranty card


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