Verdict: 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.
Winner: Sennheiser HD 660S2
Sennheiser HD 660S2: 8.5/10
Beyerdynamic DT 900 Pro X: 7.8/10
The Sennheiser HD 660S2 delivers a neutral sound with 150-ohm impedance and costs around $550, while the Beyerdynamic DT 900 Pro X offers an analytical sound with 250-ohm impedance for about $400. Reviews often praise the HD 660S2 for comfort and the DT 900 Pro X for its professional build.
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