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© 2020 MAS AUDIO SCIENCE All rights reserved. 

X5i High Fidelity


In-Ear Headphones


Combining style, elite build quality and the unrivaled performance of our proprietary 5-Driver hybrid configuration, the MAS X5i delivers audiophile-class music for smartphones and mobile media players. Featuring high audio fidelity and musicality with extremely wide 5Hz to 70KHz frequency response.

​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 audio fidelity and musicality with extremely wide 5Hz to 70KHz frequency response is also High-Res Audio Certified.

Core Array Technology™

The MAS proprietary Core Array Technology™ aligns all components of the driver to increase efficiency, reduces distortion and produces unrivaled sound quality along with spacious soundstage.

The Patented MAS Headphone 


Create Infinite Possibility

All MAS X-Series Headphones and Earbuds are compatible with separate MAS XX cables which offer a range of connection and connectivity options for today's mobile and audio devices.


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 upgrade your MAS X-Series headphones as Bluetooth headphones to connect your mobile devices wirelessly.


  • MAS XX USB-C Headphone Cable: The MAS XX USB-C Headphone Cable which is installed MAS proprietary high resolution Digital Audio Converter (DAC) and 3D virtual surround processor connects to your mobile devices' USB-C port to deliver high quality digital music and exceptional surround sound for games and movies through your MAS X-Series headphones.

Cable Detachable Design

The X5i with cable detachable design and MMCX connectors allows you to upgrade or swap the headphone cable. You can even upgrade the X5i to wireless with the optional MAS XX Bluetooth Cable or to digital headphone 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 to deliver more detailed treble, refined mid-range and rich bass.

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.)

Elite Build Quality

The X5i with solid metal parts, leather-like texture, and anti-fingerprint surface features the highest build quality.

Easy To Carry

Thanks to lightweight materials, compact size and magnet-clipping mechanism, the X5i is exceptional easy to carry.


Please connect and disconnect the MMCX

cables vertically to the jacks or earbuds.


Driver Unit - 10mm Dynamic + 4 Balanced Armature

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