Short answer: both are discontinued, so this only matters if you are buying used. Used, the Sennheiser HD 555 is the better pick: it ranks #194 of 382 over-ear headphones by sound quality (rated 3.6/5), against #225 (rated 3.5/5) for the Sennheiser HD 518. If you want one new, the Dan Clark Audio E3 ranks #1 at $2,299.
The case for the Sennheiser HD 518: Measured response gives it a solid Harman preference score of 70 with a 2.73 dB spread. The catch: Discontinued, so it is mainly found used.
Why pick the Sennheiser HD 555: Measured response gives it a solid Harman preference score of 73 with a 3.22 dB spread, and its mids sit within about 0.5 dB of target, so vocals and instruments sound natural. The catch: Discontinued, so it is mainly found used.
Buy the Sennheiser HD 555 only if you find one used in good condition; both are discontinued, and it is the better rated of the two. For a new speaker, start with the Dan Clark Audio E3 instead.
Looking for alternatives? See the complete Headphones rankings.
Specifications Side By Side
| Sennheiser HD 518 | Sennheiser HD 555 | |
|---|---|---|
| Price | Discontinued | Discontinued |
| Ranked | #225 of 382 in Over-Ear Headphones | #194 of 382 in Over-Ear Headphones |
| Form Factor | Over-ear | Over-ear |
| Back | Open | Open |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Dynamic |
| Impedance | 50 ohms | 50 ohms |
| Frequency Response | 14Hz - 26kHz | 15Hz - 28kHz |
| Weight | 0.6 lbs (255g) | 0.6 lbs (260 g) |
| Harman Preference Score | 70 (measured by oratory1990, via AutoEQ) | 73 (measured by oratory1990, via AutoEQ) |
| Deviation From Target | 2.73 dB standard deviation | 3.22 dB standard deviation |
| Tonal Tilt | -0.64 (negative is warmer, positive brighter) | +0.08 (negative is warmer, positive brighter) |
| Sub-bass Extension | Falls 6 dB below target at 42 Hz (-9.2 dB at 30 Hz) | Falls 6 dB below target at 75 Hz (-10.7 dB at 30 Hz) |
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The Two Headphones In Full
Sennheiser HD 518 Discontinued eBay
Pros: Measured response gives it a solid Harman preference score of 70 with a 2.73 dB spread.
Cons: Discontinued, so it is mainly found used. Sub-bass is 9.2 dB short at 30 Hz, so deep bass lacks rumble.
Full Sennheiser HD 518 review and specifications →
| Released | 2010 (16 years ago) |
|---|---|
| Back | Open |
| Connection | Wired |
| Deviation From Target | 2.73 dB standard deviation |
| Driver Type | Dynamic |
| Form Factor | Over-ear |
| Frequency Response | 14Hz - 26kHz |
| Harman Preference Score | 70 (measured by oratory1990, via AutoEQ) |
| Impedance | 50 ohms |
| Sub-bass Extension | Falls 6 dB below target at 42 Hz (-9.2 dB at 30 Hz) |
| Tonal Tilt | -0.64 (negative is warmer, positive brighter) |
| Weight | 0.6 lbs (255g) |
EQ preset to match the Harman target
Set a preamp of -6.2 dB, then add these filters in any parametric equalizer (Wavelet, Equalizer APO, Peace, or a player with parametric EQ). Calculated by AutoEQ from its measured frequency response.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +8.1 dB | 0.70 |
| Peak | 101 Hz | -4.9 dB | 0.25 |
| Peak | 1,521 Hz | +4.9 dB | 1.58 |
| Peak | 36 Hz | +1.8 dB | 2.67 |
| Peak | 8,744 Hz | +1.5 dB | 0.39 |
| High shelf | 10,000 Hz | -0.3 dB | 0.70 |
| Peak | 104 Hz | +1.8 dB | 4.84 |
| Peak | 77 Hz | -0.8 dB | 2.37 |
| Peak | 2,520 Hz | -0.9 dB | 3.39 |
| Peak | 2,016 Hz | +0.6 dB | 3.37 |
- Reviews, Comparisons and Sound Samples
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Sennheiser HD 555 Discontinued eBay
Pros: Measured response gives it a solid Harman preference score of 73 with a 3.22 dB spread, and its mids sit within about 0.5 dB of target, so vocals and instruments sound natural.
Cons: Discontinued, so it is mainly found used. Sub-bass is 10.7 dB short at 30 Hz, so deep bass lacks rumble. Treble sits about 6.2 dB low, so it sounds a little dark.
Full Sennheiser HD 555 review and specifications →
| Back | Open |
|---|---|
| Connection | Wired |
| Deviation From Target | 3.22 dB standard deviation |
| Driver Type | Dynamic |
| Form Factor | Over-ear |
| Frequency Response | 15Hz - 28kHz |
| Harman Preference Score | 73 (measured by oratory1990, via AutoEQ) |
| Impedance | 50 ohms |
| Sub-bass Extension | Falls 6 dB below target at 75 Hz (-10.7 dB at 30 Hz) |
| Tonal Tilt | +0.08 (negative is warmer, positive brighter) |
| Weight | 0.6 lbs (260 g) |
EQ preset to match the Harman target
Set a preamp of -6.3 dB, then add these filters in any parametric equalizer (Wavelet, Equalizer APO, Peace, or a player with parametric EQ). Calculated by AutoEQ from its measured frequency response.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +6.4 dB | 0.70 |
| Peak | 8,770 Hz | +6.5 dB | 0.18 |
| Peak | 235 Hz | -2.1 dB | 0.68 |
| Peak | 3,192 Hz | -8.7 dB | 1.46 |
| Peak | 1,085 Hz | -2.8 dB | 1.57 |
| High shelf | 10,000 Hz | -6.0 dB | 0.70 |
| Peak | 5,370 Hz | -2.7 dB | 6.00 |
| Peak | 4,426 Hz | +1.9 dB | 5.91 |
| Peak | 6,356 Hz | +2.3 dB | 5.93 |
| Peak | 65 Hz | +0.8 dB | 4.09 |
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