Short answer: the Sennheiser HD 550. It ranks #5 of 165 over-ear headphones by sound quality, rated 4.5/5, at $199.95; the Sennheiser HD 820 ranks #139, rated 2.7/5, and costs $1,999.95, so there is little reason to consider the other one.
The Sennheiser HD 550 is the better-sounding choice. A preference score of 94 in oratory1990’s measurement, with only 1.63 dB of deviation and an almost perfectly neutral tilt, means voices, instruments and mixes sound natural and accurate. The tradeoff: Sub-bass averages 6 dB below target and falls 6 dB under by 34 Hz, so deep electronic bass and organ notes lack rumble.
Why pick the Sennheiser HD 820: It is a closed back flagship, so it isolates and keeps sound in, unlike most headphones at this price. Watch for: In oratory1990’s measurement presence and treble sit about 3 dB below target from 3 to 10 kHz with a 6.6 dB dip near 11.7 kHz, so cymbals and detail sound dull and veiled.
Buy the Sennheiser HD 550. It is rated higher for sound quality than the Sennheiser HD 820 and costs less, so only choose the other one for a particular feature it does better.
Looking for alternatives? See the complete Headphones rankings.
Specifications Side By Side
| Sennheiser HD 550 | Sennheiser HD 820 | |
|---|---|---|
| Price | $199.95 | $1,999.95 |
| Ranked | #5 of 165 in Over-Ear Headphones | #139 of 165 in Over-Ear Headphones |
| Form Factor | Over-ear | Over-ear |
| Harman Preference Score | 94 (measured by oratory1990, via AutoEQ) | 52 (measured by oratory1990, via AutoEQ) |
| Deviation From Target | 1.63 dB standard deviation | 3.55 dB standard deviation |
| Tonal Tilt | +0.01 (negative is warmer, positive brighter) | -1.15 (negative is warmer, positive brighter) |
| Sub-bass Extension | Falls 6 dB below target at 34 Hz (-6.8 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (+4.0 dB at 30 Hz) |
| Connection | Wired | Wired |
| Back | Open | Closed |
| Driver Type | Dynamic | Dynamic |
| Drivers | 1 x 38mm dynamic | 1 x 56mm dynamic |
| Impedance | 150 ohms | 300 ohms |
| Sensitivity | 106.7 dB/mW | 103 dB SPL/V |
| Weight | 0.5 lbs (237 g) | 0.8 lbs (360 g) |
| Frequency Response | 6Hz - 39.5kHz (Manufacturer specified) | 12Hz - 43.8kHz (Manufacturer specified) |
| Built-in Microphone | No | No |
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How Sennheiser HD 550 compares with other leading options:
- Sennheiser HD 550 vs Sennheiser HD 600
- Sennheiser HD 505 vs Sennheiser HD 550
- Sennheiser HD 550 vs Sennheiser HD 650
- Sennheiser HD 550 vs Sennheiser HD 599
- Sennheiser HD 550 vs Sennheiser HD 569
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The Two Headphones In Full
Sennheiser HD 550: $199.95 B&H Photo Video eBay
Pros: A preference score of 94 in oratory1990’s measurement, with only 1.63 dB of deviation and an almost perfectly neutral tilt, means voices, instruments and mixes sound natural and accurate. Midrange and presence stay within about 1 dB of target, so vocals are clear without any harshness. At 237 g it is light, and 106.7 dB/mW sensitivity lets it reach normal levels from most sources despite its 150 ohm impedance.
Cons: Sub-bass averages 6 dB below target and falls 6 dB under by 34 Hz, so deep electronic bass and organ notes lack rumble. A 5.9 dB dip near 9.5 kHz slightly softens cymbal shimmer, and the open back leaks sound and offers no isolation. The Philips Fidelio X2HR earns the same rating for less money.
Full Sennheiser HD 550 review and specifications →
| Released | Mar 2025 (1 year ago) |
|---|---|
| Back | Open |
| Built-in Microphone | No |
| Connection | Wired |
| Deviation From Target | 1.63 dB standard deviation |
| Driver Type | Dynamic |
| Drivers | 1 x 38mm dynamic |
| Form Factor | Over-ear |
| Frequency Response | 6Hz - 39.5kHz (Manufacturer specified) |
| Harman Preference Score | 94 (measured by oratory1990, via AutoEQ) |
| Impedance | 150 ohms |
| Sensitivity | 106.7 dB/mW |
| Sub-bass Extension | Falls 6 dB below target at 34 Hz (-6.8 dB at 30 Hz) |
| Tonal Tilt | +0.01 (negative is warmer, positive brighter) |
| Weight | 0.5 lbs (237 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 | +8.0 dB | 0.70 |
| Peak | 67 Hz | -3.4 dB | 0.34 |
| Peak | 9,968 Hz | +3.2 dB | 1.23 |
| Peak | 1,280 Hz | -2.1 dB | 1.99 |
| Peak | 2,040 Hz | +2.2 dB | 1.90 |
| High shelf | 10,000 Hz | -4.3 dB | 0.70 |
| Peak | 4,135 Hz | +2.3 dB | 5.98 |
| Peak | 5,001 Hz | -1.7 dB | 5.47 |
| Peak | 56 Hz | -0.7 dB | 2.46 |
| Peak | 83 Hz | +0.6 dB | 3.02 |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
Sennheiser HD 820: $1,999.95 Amazon eBay
Pros: It is a closed back flagship, so it isolates and keeps sound in, unlike most headphones at this price. Bass sits 3 to 4 dB above the Harman target and holds down to 20 Hz, which suits warm and bassy taste profiles. It rates above the AKG K872 Pro and the Fostex TH900 at about the same price.
Cons: In oratory1990’s measurement presence and treble sit about 3 dB below target from 3 to 10 kHz with a 6.6 dB dip near 11.7 kHz, so cymbals and detail sound dull and veiled. The 300 ohm impedance needs a dedicated headphone amp to reach proper volume, and the Dan Clark Audio Voce and the Focal Stellia both rate higher.
Full Sennheiser HD 820 review and specifications →
| Released | 2018 (8 years ago) |
|---|---|
| Back | Closed |
| Built-in Microphone | No |
| Connection | Wired |
| Deviation From Target | 3.55 dB standard deviation |
| Driver Type | Dynamic |
| Drivers | 1 x 56mm dynamic |
| Form Factor | Over-ear |
| Frequency Response | 12Hz - 43.8kHz (Manufacturer specified) |
| Harman Preference Score | 52 (measured by oratory1990, via AutoEQ) |
| Impedance | 300 ohms |
| Sensitivity | 103 dB SPL/V |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+4.0 dB at 30 Hz) |
| Tonal Tilt | -1.15 (negative is warmer, positive brighter) |
| Weight | 0.8 lbs (360 g) |
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 | -2.9 dB | 0.70 |
| Peak | 147 Hz | -8.6 dB | 1.79 |
| Peak | 294 Hz | +7.6 dB | 2.24 |
| Peak | 5,732 Hz | +1.8 dB | 0.18 |
| Peak | 965 Hz | -3.9 dB | 1.74 |
| High shelf | 10,000 Hz | -1.1 dB | 0.70 |
| Peak | 74 Hz | +6.7 dB | 2.74 |
| Peak | 69 Hz | -2.8 dB | 0.80 |
| Peak | 3,823 Hz | +3.6 dB | 5.33 |
| Peak | 5,091 Hz | -4.0 dB | 5.68 |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons