General Graph Database
Graph Comparison Tool (for Headphones)
Sorry for the radio silence the past week or so, I’ve been busy doing… well, this.
100+ headphones has been added to the “official” IEF headphones graph database, and with that number I am now comfortable enough to push it as a public release. Some further details:
- Each dataset is obtained from both left and right channels so as to get better averages and also provide insight on channel matching consistency.
- Each channel is an average of 3 placements, for a total of 6 data points per set.
- Placements are done so in as “natural” positions as possible. Odd positions are not forced, getting different measurements for the sake of different measurements seems rather counterintuitive.
- Placements are also selected according to seal. Compromised seal data points are omitted from the data set, and the “best 3” are selected.
As you can see from the above picture, the Graph Comparison Tool (for headphones) is also up. For now, it allows for unlimited comparison points as well as the ability of overlay the following target curves:
- Proprietary “IEF Neutral” target
- GRAS KEMAR-specific Diffuse Field response
- GRAS KEMAR-specific Free Field response
- Harman In-room flat (which is derived with a GRAS KEMAR)
- Harman AE/OE 2018 target
Full functionality will be up till November. After that, all public users will only be able to compare up to 2 entries, though everyone will still be able to select the “IEF Neutral” target for overlay. The other target curves will only be available to premium subscribers, as will the ability to compare unlimited entries.
The following headphones have been added to the database:
- 1MORE MK801
- Acoustic Research AR-H1
- AKG K371
- AKG K812
- Audeze LCD-1
- Audeze LCD-2
- Audeze LCD-2 Classic
- Audeze LCD-2 Closed Back
- Audeze LCD-3
- Audeze LCD-MX4
- Audeze LCD-X
- Audeze LCD-XC
- Audeze Sine DX
- Audio Technica ATH-A990Z
- Audio Technica ATH-AWAS
- Audio Technica ATH-AWKT
- Audio Technica ATH-M40x
- Audio Technica ATH-M50x
- Audio Technica ATH-M50xBT
- Audio Technica ATH-M70x
- Audio Technica ATH-MSR7b
- Audio Technica ATH-R70x
- B&O BeoPlay H7
- Beyerdynamic Amiron Home
- Beyerdynamic DT1770 Pro
- Beyerdynamic DT1990 Pro
- Beyerdynamic DT250
- Beyerdynamic DT770 Pro
- Beyerdynamic DT860
- Beyerdynamic DT880 Pro
- Beyerdynamic DT990 Pro
- Beyerdynamic T1 (3rd Gen)
- Beyerdynamic T5 (3rd Gen)
- Beyerdynamic T5p (1st Gen)
- Beyerdynamic T70
- Beyerdynamic TYGR 300 R
- BLON B20
- Bose Noise Cancelling Headphones 700
- Bose QuietComfort 35 II (QC35)
- Campfire Cascade
- DCA Aeon 2 Closed
- DCA Aeon 2 Open
- DCA Ether 2
- DCA Ether C Flow 1.1
- DCA Ether Flow 1.1
- DCA Voce
- Denon AH-D5000
- Drop x THX Panda
- E-MU Teak
- E-MU Walnut
- Final D8000 Pro
- Focal Clear
- Focal Elear
- Focal Listen Professional
- Focal Stellia
- Focal Utopia
- Grado GW100
- Grado SR60e
- Grado SR80e
- HarmonicDyne Helios
- HEDDphone
- Hifiman Ananda
- Hifiman Arya
- Hifiman Deva
- Hifiman HE1000
- Hifiman HE6
- Hifiman Sundara
- iBasso SR1
- iBasso SR2
- Kennerton Thror
- Klipsch Heritage HP-3
- Koss KSC75
- Massdrop x AKG K7XX
- Meze 99 Classics
- Meze Empyrean
- Philips SHP9500
- Pioneer SE-2P
- Pioneer SE-Master1
- Rosson RAD-0
- Sansui SS-10
- Sennheiser HD25 Plus
- Sennheiser HD400S
- Sennheiser HD600
- Sennheiser HD650
- Sennheiser HD660S
- Sennheiser HD800
- Sennheiser HD800S
- Sennheiser HD820
- Sennheiser Momentum 2.0 Wireless
- Shure Aonic 50
- Shure SRH840
- Sony MDR-V6
- Sony MDR-Z1R
- Sony WH-1000XM4
- Spirit Torino Radiante
- Stax SR-007
- Stax SR-009
- Stax SR-009S
- Stax SR-L300
- Stax SR-L500
- Stax SR-L700
- V-MODA Crossfade 2 Wireless
- V-MODA Crossfade LP2
- ZMF Aeolus
- ZMF Atticus
- ZMF Auteur
- ZMF Eikon
- ZMF Verite
- ZMF Verite Closed
Obligatory credits section.
GRAS 43AG-7 partly funded by:
Headphones.com
Soranik
Riveton Headphones & Goldvein Cables
Super* Review
Prisma Audio
Special thanks to >$50 contributors:
Hawaiibadboy
Jon Bokic
Alan Lin
Robert Taylor
Tareq Abou Samra
Denis Dmitriev
Jonathan Pelchat
Random Bot
Desert Scrub
rofflemywaffle
oSeven brother
Joe Curcio
Daniel Thomas
Wasley
Jakob Tsang
Jay Yang
Teddy Ong
Ian Maddela
Michael Giardina
Hardeep Singh
Michael George
Leneo
Edward Yap
James Nguyen
Support me on Patreon to get access to tentative ranks, the exclusive “Clubhouse” Discord server and/or access to the Premium Graph Comparison Tool! With current efforts to measure more headphones, those in the exclusive Patreon Discord server get to see those measurements first before anybody else.
My usual thanks to all my current supporters and shoutouts to my big money boys:
“McMadface”
“Galactus”
Will
Man Ho
Denis
Alexander
John
5 thoughts on “IEF Headphone Graph Database: Public Release”
Awesome! Thank you for this!
Fantastic work as always. Pretty sure it’s gonna turn into the defacto headphone comparison tool, like your iem one!
One question though. I’m just going through the headphone graph comparison tool.
And found that the target curves (IEF and Harman) in legacy comp. have peaks around 6k & 9k, while the GRAS one doesn’t. Any specific reason for that?
The legacy rig (EARS + 711) does not conform to any industry standard. Additional calibration is required for its data to be used with Harman research, which is done on a GRAS KEMAR. As such, the IEF Neutral target on the legacy rig will be different from the target on the new GRAS 43AG-7 rig mainly due to the different pinna (and to certain extent, the occluded-ear coupler) used.
Makes sense. Thank you!
Well, outstanding! I finally have pictures of how my headphones sound! This helps immensely.
My casual, walking-around headphones are the B&O H7, and I am wondering: are those graphs wired or wireless?