Audio Reviews

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Our Raw and Corrected Frequency Response Curves

audioreviews.org measurements database

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audioreviews.org measurements database

Raw Frequency Responses: Jürgen and Biodegraded (2 cm Tube Coupler; 1.5 cm Insertion Depth) 

Note: Biodegraded and Jürgen use the same rig and coupler [our measurement setup]. No correction is applied. The raw database is internally consistent and can be used for earphone comparisons.

  1. Anew X-One (3 modules)
  2. Acoustyx R-220
  3. AME Custom Argent Hybrid Electrostatic
  4. Alpex HSE-A2000
  5. Alpex HSE-A2000 (modded and measured by Biodegraded)
  6. B&W C5 S2
  7. Beyerdynamic Byron
  8. Blitzwolf BW ES1 (modded)
  9. Blon BL-03
  10. Boarseman CX98 (modded)
  11. Boarseman KR25D
  12. BQEYZ KC2
  13. Brainwavz Delta
  14. Brainwavz Koel 1st pair (JK) | 1st pair (Bio) | 2nd pair (JK) 
  15. Brainwavz B100
  16. Brainwavz B200 v1
  17. Brainwavz B400  1st pair | 2nd pair | 3rd pair (all by Biodegraded)
  18. Cambridge Audio SE1
  19. Cozoy Hera C103
  20. Drop + JVC HA-FXD1
  21. Dunu DM-380
  22. DZAT DR-25
  23. Earstudio HE100
  24. Einsear T2
  25. EZAudio D4
  26. Fidue A65 1st pair | 2nd pair
  27. Fidue A66
  28. FiiO FD1
  29. FiiO FH1s
  30. Final Audio E1000
  31. Focal Spark
  32. Focal Sphear
  33. Fostex TE-02
  34. Hifiman RE-400
  35. Hifiman RE-400 (measured by Biodegraded)
  36. HifiWalker A1 (ootb; measured by Biodegraded)
  37. HifiWalker A1 (modded)
  38. HifiWalker A1 (modded, measured on two different rigs)
  39. Hill Audio Altair • RA narrow-bore |wide-bore | comparison
  40. Hill Audio S8 (default filters)
  41. Hill Audio S8 (all included filters)
  42. iBasso IT01 v1 ootb |  screens removed
  43. iBasso IT01 v2
  44. iBasso IT01 v1 and v2
  45. Ikko OH1
  46. JVC HA-FM103M-B
  47. KBEAR Believe
  48. KBEAR Diamond
  49. KBEAR hi7 (Biodegraded)
  50. KBEAR hi7 (Jürgen Kraus)
  51. KBEAR KS2
  52. KBEAR TRI I3
  53. Kinboofi MK4
  54. Knowledge Zenith ASX
  55. Knowledge Zenith AS10
  56. Knowledge Zenith ATR (measured by Biodegraded)
  57. Knowledge Zenith EDR2 (different filters: silver metal and red textile)
  58. Knowledge Zenith ED3 (as is and modded)
  59. Knowledge Zenith ED3M
  60. Knowledge Zenith ED4 (as is and modded)
  61. Knowledge Zenith EDX
  62. Knowledge Zenith ZS4
  63. Knowledge Zenith ZS5 (measured by Biodegraded)
  64. Knowledge Zenith ZS6
  65. Knowledge Zenith ZSN
  66. Knowledge Zenith ZSN Pro X
  67. Knowledge Zenith ZSR (measured by Biodegraded)
  68. Knowledge Zenith ZS10 (measured by Biodegraded)
  69. Koss KSC75 [stock/Yaxi pads] (measured by Biodegraded)
  70. LG Quadbeat 3
  71. Lker i8 (as is and modded)
  72. Moondrop Crescent
  73. Moondrop Kanas Pro
  74. Moondrop Kanas Pro (measured by Biodegraded)
  75. Moondrop Starfield
  76. NAD HP20
  77. NiceHCK Bro
  78. NiceHCK DB3 (measured by Biodegraded)
  79. NiceHCK DT600
  80. NiceHCK EB3
  81. NiceHCK EP10
  82. NiceHCK EP35
  83. NiceHCK M6 (default filters)
  84. NiceHCK M6 (default filters; 5 different cables)
  85. NiceHCK M6 (all included filters)
  86. NiceHCK M6 (3rd-party “aired” filters)
  87. NiceHCK M6 (default filters and third party filters)
  88. NiceHCK NX7
  89. NiceHCK NX7 (ootb and after 70 hrs playtime)
  90. NiceHCK NX7 MK3
  91. NiceHCK NX7 PRO
  92. NiceHCK N3
  93. NiceHCK P3
  94. NiceHCK X49
  95. NF Audio NM2+
  96. Paiaudio DR2
  97. PHB EM-023
  98. Philips SHE7055WT
  99. Philips TX2
  100. Pioneer CH3
  101. Pioneer CH3 (modded)
  102. Pioneer CH3 (ootb and modded)
  103. Remax RM720i
  104. Remax RM 720i (ootb and modded)
  105. Senfer DT6
  106. Senfer UEs
  107. Sennheiser IE 40 PRO
  108. Sennheiser IE 400 PRO
  109. Sennheiser IE 500 PRO
  110. Sennheiser Momentum In-Ear
  111. Shozy Form 1.1
  112. Shozy Form 1.4
  113. Shozy Rouge
  114. Simgot EM2 narrow-bores | wide-bores | both tips
  115. Sony MH1C
  116. Sony MH755
  117. Sony XBA-C10W
  118. Soundmagic E10C
  119. Tanchjim Blues
  120. Tanchjim Cora
  121. Tennmak Dulcimer
  122. Tinaudio T1
  123. Tinaudio T2
  124. Tinaudio T2 (taped front vents)
  125. Tin Hifi T2 Plus
  126. Tin Hifi T4
  127. TRN BA5
  128. TRN-STM
  129. TRN V80 (measured by Biodegraded)
  130. TRN V90
  131. TRN V90s
  132. Ultimate Ears 900s (measured by Biodegraded)
  133. Xiaomi Piston 3
  134. Venture Electronics Bonus Edition IE
  135. VJJB K4S
  136. Yinyoo D2B4 (pre-mid March 2019 tuning)
  137. Yinyoo D2B4 (mid-March 2019 tuning) | FR vs. output impedance (measurements by Biodegraded)
  138. Yinyoo V2
  139. Zero Audio Carbo Tenore
audioreviews.org measurements database

Corrected Frequency Responses: Jürgen and Biodegraded (2 cm Tube Coupler; 1.5 cm Insertion Depth) 

Note: In this series, each raw measurement is adjusted by an empirical correction that attempts to emulate measurements from an imitation B&K IEC60318-4 system as used in the Crinacle database. This corrected database is internally NOT CONSISTENT. The degree and position of the inconsistencies are NOT PREDICTABLE . The correction is work in progress and needs improvement to increase the user’s confidence level. Right now, these corrected graphs are only useful as a qualitative/semi-quantitative approach for characterizing an earphone in a review.

  1. Anew X-One (3 modules)
  2. Beyerdynamic Soul Byrd
  3. Blon BL-03
  4. Cozoy Hera C103
  5. Earstudio HE100
  6. FiiO FD1
  7. JVC HA-FDX1
  8. KBEAR Believe
  9. KBEAR Diamond
  10. KBEAR KS2
  11. KBEAR TRI I3
  12. Knowledge Zenith ASX
  13. Knowledge Zenith EDX
  14. Knowledge Zenith ZSN Pro X
  15. Earstudio HE100
  16. Moondrop Illumination
  17. Moondrop Spaceship
  18. Moondrop SSP
  19. Moondrop SSR
  20. Moondrop Starfield
  21. NiceHCK NX7 MK3
  22. NiceHCK NX7 PRO
  23. NiceHCK X49
  24. NM Audio NF2+
  25. Queen of Audio Pink Lady
  26. Sennheiser IE40 PRO
  27. Sennheiser IE400 PRO
  28. Sennheiser IE500 PRO
  29. Shozy Form 1.1
  30. Shozy Form 1.4
  31. Shozy Rouge
  32. Sony MH755
  33. Tanchjim Blues
  34. Tin Hifi T2 Plus
  35. Tin Hifi T4
  36. TRN-STM
  37. TRN-VX
  38. TRN V90s
  39. Venture Electronics Bonus Edition IE
  40. Whizzer Kylin HE01
audioreviews.org measurements database

Raw Frequency Responses: Durwood (2.5 cm Tube Coupler; 2 cm Insertion Depth)

  1. BCD X10
  2. BQEYZ Spring 1 (small reference tips)
  3. BQEYZ Spring 1 (reference tips)
  4. BQEYZ Spring 2
  5. Cat Ear Mia
  6. CCA CA10 Pro
  7. CCA CA16
  8. Hidizs MS1 Rainbow
  9. KBEAR Diamond
  10. Shozy Form 1.4
  11. Shozy Rouge
  12. Tin Hifi T4
  13. TRN BA5
  14. TRN STM
  15. TRN V9 (small silicone stock tips)
  16. TRN V90 (stock tips)
audioreviews.org measurements database

IEC711 Coupler: KopiOkaya

  1. Audiosense DT200
  2. Blon BL-01
  3. Blon BL-03
  4. Blon BL-05
  5. Blon BL-05s
  6. Etymotic ER2XR
  7. Etymotic ER4XR
  8. FiiO FD1
  9. JVC HA-FDX1
  10. KBEAR Believe
  11. KBEAR Believe vs. Dunu Luna vs. Final Audio A8000
  12. KBEAR Diamond (Beta)
  13. KBEAR KS2
  14. KBEAR hi7
  15. KBEAR KB04
  16. KBEAR Lark
  17. LZ A7
  18. Moondrop Kanas Pro
  19. Moondrop SSR
  20. Sony MH1
  21. Sony MH755
  22. Tin Hi T2 Plus
  23. TRI I3
  24. TRI I4
  25. TRI Starsea
  26. TRN BA5
  27. TRN BA8
  28. TRN M10
  29. TRN ST1
  30. TRN V90 (three different IEC711 couplers)
  31. TRN V90s
  32. Unknown 2+1 prototype (2019-10-11)
audioreviews.org measurements database

You find over 300 earphone measurements in Crinacle’s database.

Headflux also offers a large database.

Author

  • Our Raw and Corrected Frequency Response Curves 1

    Head-Fier since 2016. He has been known as “Otto Motor” to Head-Fiers, as “Dr. Schweinsgruber” to audiobudget.com users and Youtubers, and as “Brause” to Super Best Audio Friends and the Headphone Community. - For the purpose of confusion, he decided to pose under his real name Jürgen Kraus (“JK”) from now on. - This is a hobby. In “real” life, Jürgen is a professional geologist operating his own petroleum-exploration consulting company Franconia Geoscience Ltd. (see ad in the footer) based in Calgary, Canada. He holds German and Canadian passports. Jürgen had a classical music education from childhood through high school in Germany and he has been following popular music developments since the late 1970s. His understanding of arts and crafts was influenced by Bauhaus pragmatism: “less is more” and “form follows function”.

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