The Sennheiser HD 800 S outperforms the Bose QuietComfort Ultra in pure audio fidelity, offering a 47 dB wider frequency range and 0.02 % THD versus the QC Ultra’s 20 Hz–20 kHz range and 0.05 % THD (RTINGS, Stereophile). However, the QC Ultra wins on practicality with 30 h of ANC‑enabled battery life and wireless Bluetooth 5.3 connectivity, which the HD 800 S lacks (CNET, Wirecutter). For most ...
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