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Side-by-side comparison — scores, specs and which one fits your setup.
Specs comparison
Analysis
The Sennheiser HD 660S2 scores 9.1/10 with 300Ω impedance and 104dB sensitivity. At 300Ω, it benefits significantly from a dedicated amplifier.
The Sony WH-1000XM4 scores 8.2/10 with 47Ω impedance and 101dB sensitivity. At 47Ω, it can be driven directly without extra hardware.
Based on our scoring, the Sennheiser HD 660S2 scores higher overall. However, the right choice depends on your full audio chain — use our analyzer to see which fits your actual setup.
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A high headphone score doesn't mean your audio sounds great. Your DAC, amp or source might be the real bottleneck.