Fearless Audio S4

Fearless Audio S4 - S4

Fearless Audio S4 4BA 2Pin 0.78mm Detachable HiFi Audiophile In-ear Earphone IEMs

Transparent seriesK1- K12 (K9,K11 is ready to ship .)

Custom Faceplate :

Type A: A1-B7 is USD25

Type B: F6-F7 is USD30

Type C: C1-E5 is USD35

Type D: F1-F5,E6-E7 is USD50

Custom Fit : USD60 (Accept physical ear impressions or digital ear impressions files)

Custom orders will be shipped out within 1-2 weeks.


Technical features:adapt 4 drivers 3-way crossover 2 tubes

Sound Feature: S4 is very gratifying in the performance of popular songs. Whether it is low frequency, vocal, and resolution, it is quite satisfactory. The transparent sound quality makes the user have a good experience of the favorite music.


Driver:5 balanced armature driver(A Sonion compound low frequency, an independent Knowles intermediate frequency, an independent Knowles high frequency)



Passive noise reduction26DB

Frequency range:15HZ-20KHZ

Connector:2pin 0.78mm



Fearless S4


  • Will be shipped via DHL/UPS/EMS/FEDEX .

  •  It is required to put your phone number on the parcel, please leave me your contact number when you pay.

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Free Shipping

All listed items will be shipped though Registered Airmail with tracking number if there is no extra shipping method option listed or shipping description in the product page.

Economy shipping: Will be shipped without tracking number.

Registered Airmail : Will be shipped via such as Hong Kong post , Deutsche Post , Netherlands Post , Singapore Post, you can leave us a message if you have any requirement about the shipping method .

It will be shipped via Hong Kong Post by default, Europe countries can choose to be shipped via Deutsche Post or Netherlands Post, it is also FREE, pls leave us a message if needed.

Express service: Will be shipped via DHL/EMS/UPS/FedEx

  • Views: 5065
  • Brand: Fearless Audio
  • Product Code: S4
  • Availability: In Stock
  • $289.00

Available Options

Tags: Fearless Audio S4, 4BA, 4drivers, 2Pin, 0.78mm, Detachable