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Side-by-side comparison — scores, specs and which one fits your setup.
Specs comparison
Analysis
The ZMF Caldera scores 9.2/10 with 55Ω impedance and 95dB sensitivity. At 55Ω, it drives well from most phones without an external amp.
The Noble Audio Kublai Khan scores 9.2/10 with 18Ω impedance and 110dB sensitivity. At 18Ω, 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.