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Side-by-side comparison — scores, specs and which one fits your setup.
Specs comparison
Analysis
The KZ Castor Improved Version scores 5.2/10 with 75Ω impedance and 109dB sensitivity. At 75Ω, it drives well from most phones without an external amp.
The 7Hz Salnotes Zero scores 6.7/10 with 30Ω impedance and 108dB sensitivity. At 30Ω, it can be driven directly without extra hardware.
Based on our scoring, the 7Hz Salnotes Zero 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.