Sennheiser HD660S2 - The New Reference Standard Under 1k? - The Honest Audiophile

The Sennheiser HD660S2 is a neutral reference open back headphone. Is it the new referene standard under $1,000? How does it compare to the og HD660s or the HD600?

I purchased the HD660S2 with funds provided by patrons, YT members and my own bank account. A BIG thanks to all my supporters, much appreciated.

Purchase:
https://www.sennheiser-hearing.com/en-US/p/hd-660s2/

Chapters:
00:00 INTRO/SPECS
00:38 BOX/HI-RES STICKER/CONTENTS
02:05 DESIGH/BUILD
03:15 REPLACEMENT PADS
03:50 COMFORT/ISOLATION
04:30 SOURCE PAIRINGS
05:55 SONIC IMPRESSIONS
06:05 BASS
07:35 MIDS
08:45 TREBLE
09:50 TECHNICAL ABILITIES
12:50 VS HD660S
13:48 VS HD600
14:45 CONCLUSION
15:23 OUTRO

I am not a professional sound engineer, producer, musician, or vocalist, etc. I have not done any scientific research, measurements, or in-depth testing of any kind; just my own listening, comparing and internet reading/research. I have limited, real-life experience with recording, mixing and mastering gear. I have been involved since my teenage years with various churches as an amateur sound booth technician.

Please take these thoughts, opinions and reasonings as just that, my honest audiophile thoughts, opinions and reasonings.

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Recommended Gear:
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 HD660s: https://en-us.sennheiser.com/hd-660-s
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 X: https://cleartunemonitors.com/products/da-vinci-x-universal
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=
HeadAmp 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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