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Side-by-side comparison — scores, specs and which one fits your setup.
Specs comparison
Analysis
The Hidizs S9 Pro scores 7.2/10 with 16Ω impedance and 104dB sensitivity. At 16Ω, it drives well from most phones without an external amp.
The Audio-Technica ATH-M50x scores 7.2/10 with 38Ω impedance and 99dB sensitivity. At 38Ω, it can be driven directly without extra hardware.
Both headphones score equally. The best choice depends on your full audio chain — use our analyzer to find your actual bottleneck.
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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.