Many thanks to NF Audio for providing the NE4 Evolution for review, much appreciated.
The NF Audio NE4 has sound-changing faceplates. By swapping the faceplates, you can experience 3 different moods. 3 votes for $750, is it worth it?

Purchase/more information (non-affiliate links):
NF Audio: http://www.nfaudio.cn/en/product/438.html
HifiGo: https://hifigo.com/products/nf-audio-ne4-evolution
Linsoul: https://www.linsoul.com/products/nf-audio-ne4?_pos=1&_psq=ne4&_ss=e&_v=1.0
Shenzhen Audio: https://shenzhenaudio.com/products/nf-audio-ne4-evolution-iem-hifi-earphone-with-replaceable-frequency-dividing-faceplate
Discover the faceplate (Japan only):
https://www.amazon.co.jp/-/en/NE4Evolution-EXPLORE-product-replacement-faceplate/dp/B0B5W6X5S3

Chapters:
00:00 Introduction
01:01 Box/Contents
04:01 Tuning the faceplate
08:30 Construction/design
09:40 Fit/Tips/Comfort/Insulation
11:55 Cable/s
2:30 PM Sonic impressions
15:10 Bass
16:27 Middle
18:03 High notes
19:13 Technical skills
22:25 Conclusion
24:11 Departure

I am not a professional sound engineer, producer, musician or singer, etc. I have not done any scientific research, measurements or in-depth testing; just my own listening, comparing and internet reading/research. I have limited, hands-on experience with recording, mixing and mastering equipment. I have been involved with various churches as an amateur sound booth technician since I was a teenager.

Please consider these thoughts, opinions and reasoning as just that, my honest audiophile thoughts, opinions and reasoning.

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The Honest Audiophile Research/Review Process: https://youtu.be/UkSnoZZNyYc Tierlist:https://docs.google.com/spreadsheets/d/1nRHnsP_4vLg9DlD9kwJ6gQuEQFqhTR0lnrkxXo3AMG8/edit?usp=sharing
Audio terms/definitions: https://www.thehonestaudiophile.com/post/the-honest-audiophile-s-terms-and-definitions-guide
Test songs: https://www.thehonestaudiophile.com/post/does-your-music-preference-impact-your-sound-impressions
Amazon playlist: https://music.amazon.com/user-playlists/afb5506483ba4ae3be17c2184797ebb6sune?ref=dm_sh_ycUHvBw1lOkeqCrwPFcc45NAl
Tidal playlists:
Jazz: https://tidal.com/browse/playlist/ea7f58ba-f05d-466f-9714-936d0ab7fa0f
Soundtracks: https://tidal.com/browse/playlist/bd11187e-1811-43a7-a065-26e806f60efd
Bass: https://tidal.com/browse/playlist/0ba4d6a8-9d95-4f16-b79e-ef084a091d73
Mids and highs: https://tidal.com/browse/playlist/c5bc66bd-a907-4a0e-a976-9f02e75c126f
Tone and timbre: https://tidal.com/browse/playlist/0915f654-6962-4ff5-ae6a-ee8287b6a81b
Favorites: https://tidal.com/browse/playlist/4e9fdf64-df26-4d06-ae4d-273ed04e4550

Recommended equipment:
Audeze LCD-5: https://www.audeze.com/products/lcd-5
Rosson Audio Design RAD-0: http://www.rossonaudiodesign.com/
Meze Empyrean: https://mezeaudio.com/products/meze-empyrean
Hifiman Ananda: https://hifiman.com/products/detail/290
Sennheiser HD600: https://en-us.sennheiser.com/best-audio-headphones-high-end-stereo-hifi-hd-600
Sennheiser HD660s2: https://www.sennheiser-hearing.com/en-US/p/hd-660s2/clcrij55r0b570bw9bubufphu/
Austrian Audio Hi-X60: https://austrian.audio/headphones/hi-x60/
Audeze LCD 2 closed: LCD-2 closed back (audeze.com)
ADV. M5-12D: https://www.adv-sound.com/collections/pro-audio/products/m5-12d-universal
CTM Da Vinci
Westone Mach 60: https://westoneaudio.com/product/mach-60/
Tin Hifi T2: https://www.linsoul.com/products/tinhifi-t2?_pos=1&_sid=7cddd72dc&_ss=r&variant=34447375302811
Sony NW-A105: https://electronics.sony.com/audio/walkman-digital-recorders/walkman-mp3-players/p/nwa105-b
Sony NW-WM-1a: https://electronics.sony.com/audio/walkman-digital-recorders/walkman-mp3-players/p/nwwm1a
Mytek Liberty DAC ii: https://mytek.audio/shop/lbrt-dac-ii-287#attr=
Mytek Liberty THX HPA: https://mytek.audio/shop/liberty-thx-285#attr=
Main amplifier GSX-Mini: https://www.headamp.com/products/gs-x-mini
Tor Audio Roger: https://toraudio.com/main.html#
Schiit Audio BiFrost 2: https://schiit.com/products/bi-frost-1
Massdrop THX AAA 789:
https://drop.com/buy/drop-thx-aaa-789-linear-amplifier?utm_source=linkshare&referer=FTSS2S
Massdrop THX AAA One Linear: https://drop.com/buy/drop-thx-aaa-one-linear-amplifier?utm_source=linkshare&referer=FTSS2S

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