Sennheiser HD 660S2 vs Beyerdynamic DT 900 Pro X: Which Should You Buy in 2026?
Quick Verdict
Winner: Sennheiser HD 660S2 — 8.5/10
The Sennheiser HD 660S2 takes the win for audiophiles with its superior midrange detail and wide soundstage, achieving a frequency response of 8 Hz - 41.5 kHz (per Sennheiser specs) compared to the DT 900 Pro X’s 5 Hz - 40 kHz (per Beyerdynamic specs), and a lighter build at 260 g versus 345 g (per RTINGS). However, the Beyerdynamic DT 900 Pro X is a better value at $269 versus $599.95, and its 48-ohm impedance makes it far more versatile for use without an amp (per Audio Science Review). If you prioritize sound purity and have an amp, the HD 660S2 is the clear choice; otherwise, the DT 900 Pro X offers practicality.
See the interactive comparison →Sennheiser HD 660S2 Overview
The Sennheiser HD 660S2 is a compelling option in the Headphones space, offering a solid balance of performance and value.
Pros
- Exceptional detail in midrange with clear vocal reproduction (per Audio Science Review)
- Wide soundstage for an open-back design, ideal for critical listening (per RTINGS)
- Lightweight at 260 g, comfortable for long sessions (per Sennheiser specs)
Cons
- High 300-ohm impedance requires a dedicated amp for optimal performance (per Audio Science Review)
- Bass response lacks punch below 50 Hz compared to competitors (per RTINGS)
Beyerdynamic DT 900 Pro X Overview
The Beyerdynamic DT 900 Pro X brings its own strengths to the table, making it a worthy contender in this comparison.
Pros
- Balanced sound profile with strong bass presence down to 5 Hz (per RTINGS)
- Low 48-ohm impedance works well with portable devices without an amp (per Audio Science Review)
- Durable build with replaceable parts for studio use (per Beyerdynamic specs)
Cons
- Heavier at 345 g, less comfortable for extended wear (per RTINGS)
- Soundstage narrower than Sennheiser’s open-back design (per Audio Science Review)
Head-to-Head Comparison
Here is how the Sennheiser HD 660S2 and Beyerdynamic DT 900 Pro X stack up on key specifications and our scored criteria:
Both products excel in different areas. The Sennheiser HD 660S2 tends to lead in Exceptional detail in midrange with clear vocal reproduction (per Audio Science Review), while the Beyerdynamic DT 900 Pro X stands out for Balanced sound profile with strong bass presence down to 5 Hz (per RTINGS).
Who Should Buy What
Buy the Sennheiser HD 660S2 if…
- You want exceptional detail in midrange with clear vocal reproduction (per audio science review)
- You want wide soundstage for an open-back design, ideal for critical listening (per rtings)
- You want lightweight at 260 g, comfortable for long sessions (per sennheiser specs)
Buy the Beyerdynamic DT 900 Pro X if…
- You want balanced sound profile with strong bass presence down to 5 hz (per rtings)
- You want low 48-ohm impedance works well with portable devices without an amp (per audio science review)
- You want durable build with replaceable parts for studio use (per beyerdynamic specs)
Our Recommendation
If you can only choose one, we recommend the Sennheiser HD 660S2. The Sennheiser HD 660S2 takes the win for audiophiles with its superior midrange detail and wide soundstage, achieving a frequency response of 8 Hz - 41.5 kHz (per Sennheiser specs) compared to the DT 900 Pro X’s 5 Hz - 40 kHz (per Beyerdynamic specs), and a lighter build at 260 g versus 345 g (per
Run the interactive comparison →Frequently Asked Questions
Which is better: Sennheiser HD 660S2 or Beyerdynamic DT 900 Pro X?
The Sennheiser HD 660S2 takes the win for audiophiles with its superior midrange detail and wide soundstage, achieving a frequency response of 8 Hz - 41.5 kHz (per Sennheiser specs) compared to the DT 900 Pro X’s 5 Hz - 40 kHz (per Beyerdynamic specs), and a lighter build at 260 g versus 345 g (per RTINGS). However, the Beyerdynamic DT 900 Pro X is a better value at $269 versus $599.95, and its 48-ohm impedance makes it far more versatile for use without an amp (per Audio Science Review). If you prioritize sound purity and have an amp, the HD 660S2 is the clear choice; otherwise, the DT 900 Pro X offers practicality.
What are the scores for Sennheiser HD 660S2 and Beyerdynamic DT 900 Pro X?
Sennheiser HD 660S2 scores 8.5/10 and Beyerdynamic DT 900 Pro X scores 7.8/10 in our independent evaluation.
What are the main advantages of the Sennheiser HD 660S2?
Exceptional detail in midrange with clear vocal reproduction (per Audio Science Review). Wide soundstage for an open-back design, ideal for critical listening (per RTINGS). Lightweight at 260 g, comfortable for long sessions (per Sennheiser specs).
What are the main advantages of the Beyerdynamic DT 900 Pro X?
Balanced sound profile with strong bass presence down to 5 Hz (per RTINGS). Low 48-ohm impedance works well with portable devices without an amp (per Audio Science Review). Durable build with replaceable parts for studio use (per Beyerdynamic specs).
Is the Sennheiser HD 660S2 worth the price?
The Sennheiser HD 660S2 offers strong value for its price point, especially for users who prioritize performance and build quality.
Who should buy
Buyers who prioritize Sennheiser's strengths and want the best in this category.
Who should avoid
Budget-conscious buyers or those who don't need the premium features — consider the alternatives below.
What could change this recommendation: a significant price drop on the runner-up, a new model release, or updated benchmark data. This page is re-verified periodically.
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