Short answer: a tie on sound quality. Both are rated 4.3/5 (#24 and #27 of 216 over-ear headphones) at nearly the same price ($279.99 vs $279), so choose on features and fit.
What the Beyerdynamic DT 900 Pro X does well: A preference score of 88 with a warm-leaning, near neutral tilt means most of the spectrum sits close to target, with bass within 0.3 dB and treble within 0.5 dB. The catch: A 9.5 dB dip near 4 kHz is the largest deviation in this group and can pull the bite out of vocals, snares and guitars.
Buy the Beyerdynamic DT 900 Pro X or the Sennheiser HD 400 Pro on features: they are rated the same for sound quality at close to the same price.
Want more options? Browse the full Headphones rankings.
Specifications Side By Side
| Beyerdynamic DT 900 Pro X | Sennheiser HD 400 Pro | |
|---|---|---|
| Price | $279.99 | $279.00 |
| Ranked | #24 of 216 in Over-Ear Headphones | #27 of 216 in Over-Ear Headphones |
| Form Factor | Over-ear | Over-ear |
| Harman Preference Score | 88 (measured by oratory1990, via AutoEQ) | 88 (median of 3 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.08 dB standard deviation | 1.57 dB standard deviation |
| Tonal Tilt | -0.04 (negative is warmer, positive brighter) | +0.31 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-4.5 dB at 30 Hz) | Falls 6 dB below target at 32 Hz (-6.6 dB at 30 Hz) |
| Connection | Wired | Wired |
| Back | Open | Open |
| Driver Type | Dynamic | Dynamic |
| Impedance | 48 ohms | 120 ohms |
| Sensitivity | 100 dB SPL (1mW/500Hz) | 110 dB SPL/V |
| Weight | 0.8 lbs (345 g) | 0.5 lbs (240 g) |
| Frequency Response | 5Hz - 40kHz (Manufacturer specified) | 6Hz - 38kHz (Manufacturer specified) |
| Built-in Microphone | - | No |
Related Headphone Comparisons
How Beyerdynamic DT 900 Pro X compares with other leading options:
- Sennheiser HD 600 vs Beyerdynamic DT 900 Pro X
- Beyerdynamic DT 900 Pro X vs HIFIMAN Ananda Stealth
- Sennheiser HD 600 vs Sennheiser HD 400 Pro
- HIFIMAN Ananda Stealth vs Sennheiser HD 400 Pro
- Sennheiser HD 505 vs Sennheiser HD 650
Prices on this page were last checked October 11, 2026 at 4:59 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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The Two Headphones In Full
Beyerdynamic DT 900 Pro X: $279.99 Amazon eBay
Pros: A preference score of 88 with a warm-leaning, near neutral tilt means most of the spectrum sits close to target, with bass within 0.3 dB and treble within 0.5 dB. At 48 ohms it plays loudly from most sources and its 345 g weight is moderate. It is rated the same as the Sennheiser HD 505 and Shure SRH840 and higher than the Audio-Technica ATH-M70x.
Cons: A 9.5 dB dip near 4 kHz is the largest deviation in this group and can pull the bite out of vocals, snares and guitars. The air band above 10 kHz is about 2 dB under target and sub-bass is about 3.5 dB light, so highs lack sparkle and deep bass lacks rumble. The open back leaks sound and gives no isolation.
Full Beyerdynamic DT 900 Pro X review and specifications →
| Released | Oct 2021 (5 years ago) |
|---|---|
| Back | Open |
| Connection | Wired |
| Deviation From Target | 2.08 dB standard deviation |
| Driver Type | Dynamic |
| Form Factor | Over-ear |
| Frequency Response | 5Hz - 40kHz (Manufacturer specified) |
| Harman Preference Score | 88 (measured by oratory1990, via AutoEQ) |
| Impedance | 48 ohms |
| Sensitivity | 100 dB SPL (1mW/500Hz) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-4.5 dB at 30 Hz) |
| Tonal Tilt | -0.04 (negative is warmer, positive brighter) |
| Weight | 0.8 lbs (345 g) |
EQ preset to match the Harman target
Set a preamp of -4.5 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 | +5.7 dB | 0.70 |
| Peak | 94 Hz | -2.3 dB | 0.22 |
| Peak | 6,103 Hz | -5.3 dB | 1.81 |
| Peak | 4,103 Hz | +3.8 dB | 4.69 |
| Peak | 6,339 Hz | +1.5 dB | 0.18 |
| High shelf | 10,000 Hz | -1.2 dB | 0.70 |
| Peak | 2,503 Hz | -0.8 dB | 3.03 |
| Peak | 59 Hz | -0.3 dB | 1.39 |
| Peak | 82 Hz | +0.7 dB | 3.97 |
| Peak | 2,966 Hz | +1.0 dB | 6.00 |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
Sennheiser HD 400 Pro: $279.00 Amazon eBay
Full Sennheiser HD 400 Pro review and specifications →
| Released | Nov 2021 (4 years ago) |
|---|---|
| Back | Open |
| Built-in Microphone | No |
| Connection | Wired |
| Deviation From Target | 1.57 dB standard deviation |
| Driver Type | Dynamic |
| Form Factor | Over-ear |
| Frequency Response | 6Hz - 38kHz (Manufacturer specified) |
| Harman Preference Score | 88 (median of 3 squig.link measurements, calibrated to AutoEQ) |
| Impedance | 120 ohms |
| Sensitivity | 110 dB SPL/V |
| Sub-bass Extension | Falls 6 dB below target at 32 Hz (-6.6 dB at 30 Hz) |
| Tonal Tilt | +0.31 (negative is warmer, positive brighter) |
| Weight | 0.5 lbs (240 g) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons