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GREQ's Headphone Measurements
  • GREQ Reviews - Headphone Frequency Response Graph Database
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  • 🦮Helpful Guides...
    • 🔬Sony MDR-SA3000 Driver Repair
    • 🪡Sennheiser Momentum Ear Pad Repair
    • 🎧Ear Pad Rolling For Noobs
    • 🤠 Headphone Sins - Hats
    • 🔥Burning-in Headphones
    • ❓Headphone Cable Guide
  • 🗃️ Ear Pad Graphs
    • YAXI stPad2-LR
  • 🗃️ IEMs
    • A9 Pro
    • Apple Airpods Pro Gen 3
    • Atomic Floyd HiDefJax
    • Audio Technica AT-CKS50
    • Beyerdynamic DX 160 ie
    • 🗃️ BLON
      • BLON BL-03
      • BLON BL-03II
    • CCZ Harmony BC01 Pro
    • Condor Airline IEM
    • Elecom HS-ARMA30E
    • Final Audio E4000
    • HTC Max 300
    • 🗃️ JVC
      • JVC Gumy Plus HA-FX5
      • JVC HA-FW1800
      • DROP + JVC HA-FWX1
      • JVC HA-FX45S
      • HA-FXZ200
    • KBEAR KB02
    • 🗃️ Kiwi Ears
      • Kiwi Ears Aether
      • Kiwi Ears Airoso
      • Kiwi Ears KE4
      • Kiwi Ears Orchestra Lite
      • Kiwi Ears Quintet
    • 🗃️ KZ
      • KZ ATE
      • KZ HBB PR2
      • KZ ZS10
        • KZ ZS10 + Jaybird foam tips
    • 🗃️ Lethal Earsubs
      • Lethal Earsubs 5556
      • Lethal Earsubs 5557
    • Metal Bullet Super Bass
    • Monster ibeats
    • Moondrop Chu II
    • no name IEM
    • One More Triple Driver
    • Philips SHE9900
    • 🗃️ Rose Technics
      • Rose Technics CERAMICS X
      • Rose Technics EARFREE-i3
      • Rose Technics EARFREE-i5
      • Rose Technics QT-X
      • Rose Technics Star City 5 Pro
    • Samsung AKG (fake product)
    • 🗃️ Sennheiser
      • Sennheiser CX300 II
      • Sennheiser CX880i
      • Sennheiser CX890i
      • Sennheiser Momentum M2 IEi
    • 🗃️ Shure
      • Shure E2
      • Shure SE-110
      • Shure SE-215
    • 🗃️ Simgot
      • Simgot EA500LM
      • Simgot EA1000
      • Simgot EM6L
      • Simgot EW300
      • Simgot Supermix 4
    • 🗃️ Sony
      • Sony IER-M7
      • Sony MDR-EX90LP + Vido drivers
      • Sony MDR-XB55
    • Thai Airways - Free Economy Class IEM - 2023
    • Thai Airways - Free Economy Class IEM - 2024
    • TRUTHEAR x Crinacle ZERO:RED
    • Yamaha EPH-30BL
  • 🗃️ Flathead Earbuds
    • - Earbud Graphs with MODIFIED miniDSP EARS
      • AIWA HP-V22
      • Aiwa Sound GT (HP-V33)
      • Aiwa HP-V35
      • AIWA HP-V151
      • AKG K315
      • Audio Technica ATH-EC707
      • Audio Technica ATH-EM707
      • JVC HA-F105
      • The Kube Black
      • The Kube Orange
      • Sabia Elibuds V6
      • Sabia Elibuds V6 - Mod Brass Shells
      • Sony MDR-E212
      • Sony MDR-E272
      • Sony MDR-E414
      • Sony MDR-E557
      • Sony MDR-E565
      • Sony MDR-E868
      • Sony MDR-E888
      • Trio KH-0.5
      • Vido (blue)
    • - (LEGACY GRAPHS - NOT COUNTED) Earbud Graphs with miniDSP EARS
      • Aiwa HP-V22
      • Aiwa HP-V151
      • Aiwa HP-V551
      • ANN200
      • Apple Earbuds (v2)
      • Apple Earbuds (v2) + foam
      • Cubu
      • JVC HA-F105
      • The Kube
      • The Kube eK2
      • LG SGEY0003721 + Vido drivers
      • 'Mono Plug'
      • Nokia HS47 + Vido drivers
      • Panasonic RP-HV377-S + Vido driver
      • Sennheiser MX365
      • Sennheiser MX365 + Vido drivers
      • Sabia V6
      • Sabia V6 Rose
      • Sabia V6 Silver
      • Samlike Retro
      • Samlike Retro + Vido drivers
      • Vido
      • Vido - Modified
  • Aiwa HP-X1000 + Shure SRH840 Ear pad
    • Aiwa HP-X1000 - minus Mica-composite domes 🛠️
  • Akai ASE-65
  • 🗃️ AKG
    • AKG K1
    • AKG K4
    • AKG K140
    • AKG K141 (+over-ear pads)
    • AKG K141 Monitor
    • AKG K240 DF
    • AKG K271 MKII
    • AKG K340
      • AKG K340 + SRH840 Pads
      • AKG K340 + Kennerton Odin Pads
    • AKG K450
    • AKG K501
      • AKG K501 - Foam Mod
      • AKG K501 - Stock vs. Foam Mod
    • AKG K518LE
    • AKG K551
    • AKG K551 + foam spacer
      • AKG K551 + Ori pads
    • AKG K612 Pro
    • AKG K1000
    • AKG Y50
  • Alpha Electronics
  • Altiat Cal.1H - Velour Pads
    • Cal.1H - Tuning Puck Removed
    • Cal.1H + Geekria Comfort Mesh Pads
  • Audeze Maxwell
    • Audeze Maxwell + Wicked Cushions Freeze Cooling Gel Ear Pads
  • 🗃️ AUDIO TECHNICA
    • ATH-A10 Anniversary
    • ATH-AD2000
      • ATH-AD2000 + HPA2000Z Pads
      • ATH-AD2000 + Aftermarket Velour Pads
    • ATH-M20
    • ATH-909
    • ATH-W10VTG Vintage
    • Denchoh DH-1
    • Magic Listening Hyper Training Phone for the DC Sound
  • Axent Wear Cat Ear Headphones 🐱 - Modified
  • Bandridge Double Drive EH910DD
    • Bandridge Double Drive EH910DD new caps
  • 🗃️ BEYERDYNAMIC
    • DT330 MKII
      • DT330 'MK3' (Modified🛠️)
        • DT330 MKII + DT770 Pads
    • DT48 5 ohm
    • DT48 ORTF 25 ohm
    • DT480 Sound Juwel - Original Pads
      • DT480 + EDT 100 S Pads
      • DT480 + EDT 100 T Pads
    • DT550 (Gold)
      • DT550 (Gold) - With new foam, minus original felt
    • DT550 (Silver) + Denon D2/5/7K Pads
    • DT770 32 Ohm
    • DT770 Pro 80 ohm
    • DT770 600 Ohm
    • DT790 + Vented like DT770
      • DT790 + DT770 250 ohm drivers + extra Thermolam damping layer
      • DT790 + new velours
      • DT790 + ATH-R70x Pads
    • DT860
    • DT880M + EF880M
      • DT880M
      • DT880M with vs. without EF880M
      • DT880M + EF880M + New pads
    • DT990 - Vintage 600 ohm (1988)
      • DT990 (1988) + HifimanVelour Pads
      • DT990 (1988) + SHP2000 Pads
    • MMX300
    • T51p
  • 🗃️ BOSE
    • QC3 (Passive Mod)
    • QC15
    • QC25 - NC On
      • QC25 - NC Off
  • Combatwing M180 PRO
  • Creative Auvana Live!
  • Denon AH-D950
    • Denon AH-D950 + MDR-Z1000 Pads
  • Dero Modell D-500
  • Dynatron SP6 - OEM of Peerless PMB-6 + AKG K619 ear pads
  • Echo TDS-16
  • 🗃️ Elecom
    • EHP-VROS310 (VR)
    • HS-ARMA100BK
  • 🗃️ Elega
    • DR-59C
    • FR-901C
  • Eurochannels EH-520
  • Exibel MHX70
  • 🗃️ FOSTEX
    • T10
    • T20RP + aftermarket pads
    • T40RP mkII - Modified
    • T50RPmk4G
    • TH808
      • TH808 without baffle foam
    • TH900mk2
  • Grado SR80 - Modified
  • Grundig GDHS 224
  • 🗃️ HIFIMAN
    • DEVA Pro
    • HE-400
      • HE-400 + Denon Pads + Thermolam disk (ear-side)
      • HE-400 + Denon D2/5/7K Pads
    • HE-500
      • HE-500 + Wang Yifei Hifiman Velour Pads
      • HE-500 + Aftermarket HE-560 Pads
      • HE-500 + Pali Pads
      • HE-500 + Modified AKG K551 pads
      • HE-500 + DIY Ear Pads
      • HE-500 + 115mm Pads + Mods
      • HE-500 + Aftermarket HE-500 pads
      • Hifiman HE-500 + Focus Pads
    • HE-6
      • HE-6 + Pali Pads
      • HE-6 + Modified AKG K551 Pads
      • HE-6 + Aftermarket HE-560 Pads
  • HORNYPHON 6320 🔥🌶️🥵
  • Hosiden DH-450-S
  • HyperX Cloud 2
  • Izumi CIS-330
  • Jabra Evolve 40
  • Jamo (Fostex T30 variant) + Sharkoon Rush Core pads
    • Jamo (Fostex T30 variant) + aftermarket ATH-M50 pads
  • 🗃️ JVC
    • HA-SR85S Ésnsy + DIY pleather pads + earside foam layer
      • HA-SR85S Ésnsy + DIY pleather pads
    • HA-D700 + MDR Z1000 pads
    • HA-D810 + Aftermarket SRH840 pads
    • HA-D990 + Aftermarket SHR840 pads and new earside foam
    • HA-D1000
    • HA-DX3
      • HA-DX3 - Driver 'magnet' damping removed
    • HA-DX1000
    • HA-M1000 + Aftermarket SRH-840 Pads
    • HA-MR77X
    • HA-MX10-B + Aftermarket MDR-Z1000 Pads
    • HA-MX100-Z
      • JVC HA-MX100-Z + Edifier W820BT Pads
      • JVC HA-MX100-Z + MDR-Z1000 Pads
      • JVC HA-MX100-Z - Z1000 Pad/Grey VS. W820BT Pad/Green
    • HA-RX700 (one side faulty)
      • HA-RX700 + Peerless HPD-50N25PR00-32 Paper dome driver
    • HA-S770-W
      • HA-S770-W (copy 2)
      • HA-S770-W (copy 2) Modified
    • HA-SD7
    • HA-SW01
      • HA-SW01 + Brainwavs Angled Pleather pads
      • JVC HA-SW01 + Brainwavz Hybrid aftermarket pads
      • JVC HA-SW01 + Leather MDR-V6/MDR-CD990ST Pads
      • JVC HA-SW01 + SRH840 pads
      • JVC HA-SW01 + Wewom pads
      • JVC HA-SW01 + ebay SW02 Pads
      • JVC HA-SW01 + YAXI stPad2-LR
      • JVC HA-SW01 + YDYBZB pads
    • HA-SZ2000 + generic aftermarket pads
      • HA-SZ2000 - Z Series vs. Live Beat + Leather VB630 Pads
      • HA-SZ2000 + generic aftermarket pads + EQ Profile
      • HA-SZ2000 + Aftermarket Leather HD630VB Pads
      • HA-SZ2000 + Aftermarket Leather HD630VB Pads + EQ
    • HP-660
    • Victor HP-D900 + Aftermarket RS195 Pleather Pads
      • Victor HP-D900 + Aftermarket RS195 Leather Pads
      • Victor HP-D900 + Aftermarket SRH840 Pads
    • HP-1000
    • HP-1100
    • STH10-E
  • Kenwood HS-5
  • 🗃️ Kiwi Ears
    • Division
    • Ellipse
  • 🗃️ KOSS
    • HV/99 (Interfunk)
    • HV/X
    • K/6X Plus + On Ear Pads
      • K/6X Plus + Aftermarket MDR-1A Pads
    • Porta Pro
    • Pro/450
    • Pro4/AA
      • Koss Pro4/AA + pressure applied
      • Pro4/AA + Fostex T50RPmkII Pads
    • Tech/2
  • Kyoto H233
  • Lasmex H120
    • Lasmex H120 + Bose QC15 Drivers
    • Lasmex H120 + Damping Mods
    • Lasmex H120 - Driver Mod
  • Lazerbuilt Minions
  • 🗃️ LOGITECH
    • G432
    • G435
  • 🗃️ MAGNAT
    • Magnat LZR-765
    • Magnat LZR-980
  • MB Electronic K600
  • Mirph Designs MIRPH-1
  • Monacor CD Laser Stereo-Kopfhoerer MD-4000 Best. Nr. 22.0080
    • Monacor CD Laser Stereo-Kopfhoerer MD-4000 Best. Nr. 22.0080 + Velour Pad
  • 🗃️ NAD
    • Model 16
    • RP18
      • RP18 'Pro Mk.6' Mod
        • NAD RP18 Mylar Mod Mk.V
          • NAD RP18 - Kapton - Mods + Brainwavz angled pads
          • NAD RP18 - Mk.III - Mylar + Ori pads
          • NAD RP18 - Mylar - Mk.IV
  • 🗃️ NAPOLEX
    • TPH-100
    • X-23
  • National EAH-88 (max tone)
    • National EAH-88 (min tone)
  • Onkyo ES-HF300
  • Oppo PM1 - Velour Pads
    • Oppo PM1 - Fenestrated Leather Pads
    • Velour VS Leather
  • 🗃️ PANASONIC
    • RP-HT360
    • HD-10 - Modified
    • RP-HX650-K
  • Patriot Viper V360
  • 🗃️ PEERLESS
    • PMB-45
      • Peerless PMB-45 + ATH-X70 Pads
      • Peerless PMB-45 + Denon D2/5/7K Pads
    • PMB 85 Double Action
    • PMB 100
  • 🗃️ PHILIPS
    • HX-5
    • N 6301
      • N 6301 + Aftermarket Pads
    • SBC 3172 'Executive'
    • SBC 484
    • SBC HP890
      • SBC HP890 + Blon S7P Drivers
      • SBC HP890 + Elecom VR Drivers
    • SHP2500
    • SHP8500
  • 🗃️ PIONEER
    • SE-2
    • SE-4
    • SE-7 + New Pleather Pads
      • SE-7 + New Velour Pads
    • SE-11 Eleven 300 ohm variant
      • SE-11 Eleven + New Velour Pads - 300 Ohm variant
      • SE-11 eleven - Over Ear Mod + HyperX Cloud Velour Pads
    • SE-15 + New pads
      • SE-15 + Turtle Beach PX21 Pads
    • SE-505
    • SE-550
    • SE-700
      • SE-700 + Brainwavs Angled Leather Pads
      • SE-700 + New Pleather Pads
    • SE-900D
      • SE-900D - Mod
    • SE-A8
    • SE-A80
    • SE-M750
    • SE-M870 + Z1000 Pads
      • SE-M870 + SW02 Pads
  • Qpad QH-85
  • 🗃️ RAZER
    • BlackShark V2 X
    • Kraken V3 X
  • Revox Synergy
    • Revox Synergy + SHP2000 Pads
  • Rockjaw Acero - Mod 2
    • Rockjaw Acero - Mod
  • Rose Technics Distant Mountain
  • Ross RE-278
  • Sansui SS-10
  • Sanyo PH300
  • Satolex Plum DH297-A1DR
    • Satolex Plum DH297-A1DR + Mod
  • 🗃️ SENNHEISER
    • HD 25-1 II
    • HD25 Aluminium
      • HD25 Aluminium + Aftermarket Pads
    • HD205
    • HD222
    • HD224X
      • HD224X + DIY foam
    • HD230 + Thermolam damping
      • HD230 + Superlux pads/Thermolam
    • HD250 Linear
      • HD250 Linear + Aftermarket Pads
    • HD250 Linear II (aftermarket pads)
    • HD280 Pro
      • HD280 Pro + Aftermarket Pads
    • HD300
    • HD320 Expression Line
    • HD340 Expression Line
    • HD414
    • HD425 + Hifiman Pleather Pad
    • HD450II
    • HD451
    • HD500
    • HD540 Reference + late version velour pads
      • HD540 + Early Production Pads
    • HD540 reference gold
      • HD540 reference gold + later velour pads
    • HD540 Reference II
      • HD540 Reference II + New aftermarket velour pads
    • HD545 Reference
    • HD545 vs. 580, 600, 650
    • HD555
    • HD560 Ovation + Aftermarket Pads (Hifiman Velour)
      • HD560 Ovation + Aftermarket Pads (Wang Yifei)
    • HD580 Precision
      • HD580 Stock vs. Aftermarket Pads
    • HD600
      • HD600 (old ear pads)
      • HD600 old vs new ear pads
    • HD650
      • HD650 (old pads)
      • HD650 old vs. new pads
    • HD600 vs HD650 - new pads
      • HD600 vs HD650 - old pads
    • HDR175
      • HDR175 + Bass Boost
      • HDR175 + Surround Low
      • HDR175 + Surround High
    • Momentum (original brown)
    • M2 AEBT (wired) + aftermarket leather pads - ANC On
      • M2 AEBT (wired) + aftermarket leather pads - ANC off
      • M2 AEBT - Wired + Foam Spacers Modification
      • M2 AEBT - Wired - NC on
      • M2 AEBT - Wired - NC off
    • PC8
    • PC360 G4ME
    • PMX100
  • Sharkoon Rush
  • Sineaptic SE-1
    • Sineaptic SE-1 - No Pad Mod
    • SE-1 Stock Pads vs. Fenestrated Leather Pads
    • SE-1 Wireless Mode vs. Bad Amp Pairing
  • Skullcandy Aviator
  • Smiggle Block Tunes
  • 🗃️ SONY
    • DR-6M
    • DR-S3 + Aftermarket SRH840 Pads
    • DR-S7
    • DR-S100 武道館 Boodo Khan
    • DR-Z6
    • MDR-1R
    • MDR-102
    • MDR-7510
      • MDR-7510 + Z1000 Pads
    • MDR-CD777
    • MDR-CD780
    • MDR-CD900ST
      • MDR-CD900ST + aftermarket MDR-1A Pads
      • MDR-CD900ST + aftermarket ATH-M50 Pads
      • MDR-CD900ST + aftermarket Z1000 pads
      • MDR-CD900ST + aftermarket leather CD900ST pads
    • MDR-CD999 + old stock pads
      • MDR-CD999 + W820BT Pads
      • MDR-CD999 + Z1000 Pads
      • MDR-CD999 + Aftermarket HA-SW01 Pad
    • MDR-CD1700 (sample 1)
      • MDR-CD1700 (sample 2)
      • MDR-CD1700 (sample 3)
      • MDR-CD1700 (Sample 1) Aftermarket Pads
      • CD1700 Sample Averages Compared
      • MDR-CD1700 + V700 Driver 🛠️
    • MDR-CD2000 (sample 1)
      • MDR-CD2000 (sample 2)
      • MDR-CD2000 New vs Old
      • MDR-CD2000 (sample 1) + Aftermarket Hifiman Velour Pads
    • MDR-M77
    • MDR-SA3000
      • MDR-SA3000 + Peerless HPD-50N25PR00-32 Drivers
    • MDR-V5 - Aftermarket Pads v2
      • MDR-V5 - aftermarket pads v1
    • MDR-V6 + Z1000 Pads
      • MDR-V6 + Z1000 Pads + Comfort foam mod
      • MDR-V6 + Old flakey pads
    • MDR-V7
      • MDR-V7 + Z1000 Pads
    • MDR-V700
      • MDR-V700 + MDR-1A Pads
      • Sony MDR-V700 + HA-MR77X Pads
    • MDR-V900
    • MDR-W10
    • MDR-XB500
    • MDR-XB700 (old pads)
    • MDR-ZX110
    • VIP-1000H
  • Soundcore Q30
  • SoundMAGIC HP100
  • 🗃️ STAX
    • SR-007
    • SR-009
    • SR-80 Pro
      • SR-80 Pro (with bass seal)
    • SR Gamma Pro (sample 1)
      • SR Gamma Pro (sample 2)
    • SR Lambda Pro
      • SR Lambda Pro
    • SR-Lambda Signature
    • SR-Lambda Spirit
    • SR-5NB (sample 1)
      • SR-5NB Stock vs. Aftermarket Denon D2/5/7K pads
      • SR-5NB (sample 2)
  • Superex ST-PRO-B
  • 🗃️ TAKSTAR
    • Pro 82
      • Pro 82 - Modified
    • XY-E1
  • Tascam TH-02
  • 🗃️ TECHNICS
    • EAH-320
    • RP-F1 + Asus ROG Delta Fabric Pads
      • RP-F1 + SRH840 Pads
    • RP-F3 + SRH840 Pads
    • RP-F5 + SRH840 Pads
    • Technics RP-FT30 + aftermarket MDR-1A pads
    • RP-HT80 - Modified
  • 🗃️ TELEFUNKEN
    • TH50
    • TH60
  • 🗃️ TOSHIBA
    • HR-811 - Low Gain Mode
      • HR-811 - High Gain Mode
    • HR-X1
      • HR-X1 - Forced bass seal with double pads
  • 🗃️ TRIO/KENWOOD
    • KH-33
    • KH-83
  • Turtle Beach Ear Force P11
  • UHER W775
  • 🗃️ ULTRASONE
    • HFI-450
    • HFI-700 + ATH-M50 Pads
    • HFI-2000 ( +HE500 pads )
      • HFI-2000 (+ Aftermarket HE500 pads)
      • HFI-2000 (+ Aftermarket HE560 Pads)
    • HFI-2200 ULE
    • Zino
  • Universum (SFI)
  • 🗃️ VIVANCO
    • Modell 8350
    • SR80
    • TV76
  • Watson Mod.940
  • Wega DSH500
  • 🗃️ YAMAHA
    • HP-1
    • HP50-A + Mods
    • RH-40M - Modified
      • RH-40M + HA-SW01 'Wewom' Pad
    • YHL-006
    • YH-5M
    • YH-100
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  1. 🗃️ AKG

AKG K551

Foam insert is just a circle of urethane over the driver to attenuate some treble

Last updated 1 year ago

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