> For the complete documentation index, see [llms.txt](https://itsgreq.gitbook.io/headphone-measurements/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://itsgreq.gitbook.io/headphone-measurements/sennheiser.md).

# 🗃️ SENNHEISER

- [HD 25-1 II](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/hd-25-1-ii.md)
- [HD25 Aluminium](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/hd25-aluminium.md): Sounds a touch punchier and fuller than regular HD25
- [HD25 Aluminium + Aftermarket Pads](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/hd25-aluminium/hd25-aluminium-+-aftermarket-pads.md): Pads have smaller holes than stock pads. Makes bass a touch bloaty, not recommended.
- [HD205](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/hd205.md)
- [HD222](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/hd222.md): Sounds better than the graph would suggest as mids are mostly flat'ish
- [HD224X](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/hd224x.md)
- [HD224X + DIY foam](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/hd224x/hd224x-+-diy-foam.md): DIY'd some replacement foam and ... wow
- [HD230 + Thermolam damping](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/hd230-+-thermolam-damping.md): No significant difference bewteen using foam or thermolam front damping
- [HD230 + Superlux pads/Thermolam](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/hd230-+-thermolam-damping/hd230-+-superlux-pads-thermolam.md): Thermolam is in place of ear-side sponge damping
- [HD250 Linear](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/hd250-linear.md)
- [HD250 Linear + Aftermarket Pads](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/hd250-linear/hd250-linear-+-aftermarket-pads.md)
- [HD250 Linear II (aftermarket pads)](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/hd250-linear-ii-aftermarket-pads.md)
- [HD280 Pro](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/sennheiser-hd280-pro.md): ...meh
- [HD280 Pro + Aftermarket Pads](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/sennheiser-hd280-pro/sennheiser-hd280-pro-+-aftermarket-pads.md): These pads looked super legit, but they're trash.
- [HD300](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/hd300.md)
- [HD320 Expression Line](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/hd320-expression-line.md)
- [HD340 Expression Line](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/hd340-expression-line.md)
- [HD414](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/hd414.md): Actually not bad, but it needs very strong amplification.
- [HD425 + Hifiman Pleather Pad](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/hd425-+-hifiman-pleather-pad.md)
- [HD450II](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/untitled-65.md): One of my all time favourite designs... you can see where the Momentum got it's design cues from.
- [HD451](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/hd451.md): Price/Performance is decent
- [HD480](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/hd480.md): With aftermarket velour pads - has a bit more bass kick at 100hz than HD450II and 480 Classic
- [HD480 Classic](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/hd480-classic.md)
- [HD500](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/hd500.md)
- [HD540 Reference + late version velour pads](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/hd540-reference-+-late-version-velour-pads.md): With the later HD540 II version velour ear pad
- [HD540 + Early Production Pads](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/hd540-reference-+-late-version-velour-pads/hd540-+-early-production-pads.md): The old fabric ones with the weird foam/plastic sandwich inside.
- [HD540 reference gold](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/hd540-reference-gold.md): With original old style pads
- [HD540 reference gold + later velour pads](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/hd540-reference-gold/hd540-reference-gold-+-later-velour-pads.md): With later HD540 II full Velour ear pads
- [HD540 Reference II](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/hd540-reference-ii.md)
- [HD540 Reference II + New aftermarket velour pads](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/hd540-reference-ii/hd540-reference-ii-+-new-aftermarket-velour-pads.md)
- [HD545 Reference](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/hd545-reference.md)
- [HD545 vs. 580, 600, 650](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/hd545-vs.-580-600-650.md)
- [HD555](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/hd555.md): Like a slightly more refined version of HD545
- [HD560 Ovation + Aftermarket Pads (Hifiman Velour)](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/hd560-ovation-+-aftermarket-pads-hifiman-velour.md)
- [HD560 Ovation + Aftermarket Pads (Wang Yifei)](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/hd560-ovation-+-aftermarket-pads-hifiman-velour/hd560-ovation-+-aftermarket-pads-wang-yifei.md)
- [HD580 Precision](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/hd580-precision.md)
- [HD580 Stock vs. Aftermarket Pads](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/hd580-precision/hd580-stock-vs.-aftermarket-pads.md): Aftermarket velour pads sound too thin. Do not recommend.
- [HD590](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/hd590.md): impressive
- [HD600](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/hd600.md): Early production copy with same drivers as HD580 Precision
- [HD600 (old ear pads)](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/hd600/hd600-old-ear-pads.md)
- [HD600 old vs new ear pads](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/hd600/hd600-old-vs-new-ear-pads.md)
- [HD650](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/sennheiser-hd-650.md): If only the soundstage wasn't so tiny.
- [HD650 (old pads)](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/sennheiser-hd-650/hd650-old-pads.md)
- [HD650 old vs. new pads](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/sennheiser-hd-650/hd650-old-vs.-new-pads.md)
- [HD600 vs HD650 - new pads](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/hd600-vs-hd650-new-pads.md): Both measured with the same set of ear pads
- [HD600 vs HD650 - old pads](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/hd600-vs-hd650-new-pads/hd600-vs-hd650-old-pads.md): Both measured with the same set of old pads
- [HDR175](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/hdr175.md): Surprisingly OK TV headphone - source volume needs to be high to prevent hissing from headphone internal amp when on very high volume
- [HDR175 + Bass Boost](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/hdr175/hdr175-+-bass-boost.md): Bass Boost button is on the paired TR175 base unit
- [HDR175 + Surround Low](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/hdr175/hdr175-+-surround-low.md): Just adds a little echo/reverb.
- [HDR175 + Surround High](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/hdr175/hdr175-+-surround-high.md): This just adds lots of reverb/echo
- [Momentum (original brown)](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/sennheiser-momentum-original-brown.md): Recurring 'blip' between 60-100Hz appears to be an E.A.R.S. artefact that is completely inaudible in reality.
- [M2 AEBT (wired) + aftermarket leather pads - ANC On](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/m2-aebt-wired-+-aftermarket-leather-pads-anc-on.md): After some EQ it's fine
- [M2 AEBT (wired) + aftermarket leather pads - ANC off](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/m2-aebt-wired-+-aftermarket-leather-pads-anc-on/m2-aebt-wired-+-aftermarket-leather-pads-anc-off.md)
- [M2 AEBT - Wired + Foam Spacers Modification](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/m2-aebt-wired-+-aftermarket-leather-pads-anc-on/sennheiser-m2-aebt-wired-+-foam-spacers-inside-the-ear-pads.md): 3mm thick, closed-cell 'craft' foam spacers installed inside the ear pads
- [M2 AEBT - Wired - NC on](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/m2-aebt-wired-+-aftermarket-leather-pads-anc-on/sennheiser-m2-aebt-wired-nc-on.md): Ear pads are old, a bit flat and mishapen, so the imbalance is from the pads not sealing correctly on the EARS
- [M2 AEBT - Wired - NC off](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/m2-aebt-wired-+-aftermarket-leather-pads-anc-on/sennheiser-m2-aebt-wired-nc-off.md): Almost no different to On - also horrible sound.
- [PC8](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/pc8.md): Lower resolution than most vintage headphones I've owned - horrible
- [PC360 G4ME](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/sennheiser-pc360-g4me.md)
- [PMX100](https://itsgreq.gitbook.io/headphone-measurements/sennheiser/sennheiser-pmx100.md): Better than PortaPro