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Side-by-side comparison — scores, specs and which one fits your setup.
Specs comparison
Analysis
The Thieaudio Monarch Mk2 scores 9.3/10 with 15Ω impedance and 98dB sensitivity. At 15Ω, it drives well from most phones without an external amp.
The Sony IER-M9 scores 9.1/10 with 16Ω impedance and 103dB sensitivity. At 16Ω, it can be driven directly without extra hardware.
Based on our scoring, the Thieaudio Monarch Mk2 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.