At first glance, both headphones check the same foundational boxes — active noise cancellation, passive noise reduction, and spatial audio support — but the frequency response figures reveal a substantial gap in audio ambition. The Sony WH-1000XM6 extends from 4 Hz to 40,000 Hz, while the QCY H3S covers the standard 20 Hz to 20,000 Hz range. The XM6's lower floor captures sub-bass rumble that most people feel rather than consciously hear, adding physical depth to music, while its upper ceiling of 40 kHz enables Hi-Res Audio playback — meaningful for users with high-bitrate sources, even if the upper range exceeds typical human hearing.
The driver size comparison is counterintuitive: the H3S uses a 40 mm driver versus the XM6's 30 mm driver. A larger driver can move more air and potentially produce stronger bass, but driver size alone does not determine output quality — engineering, materials, and tuning are equally decisive. Given that the XM6's smaller driver still achieves a far wider frequency range, Sony has clearly prioritized precision engineering over raw diaphragm area.
The Sony WH-1000XM6 holds a clear edge in this category. Its dramatically wider frequency response is a concrete, spec-supported advantage that translates to richer low-end presence and Hi-Res Audio compatibility. For users who prioritize audio fidelity, the XM6's figures are meaningfully superior to what the H3S offers on paper.