At the hardware level, both earbuds start from an identical foundation: an 11 mm dynamic driver, active noise cancellation, passive noise reduction, and spatial audio support — with neither product offering Dolby Atmos, Dirac Virtuo, or a neodymium magnet. For the majority of listeners, this shared architecture means a comparable baseline sound experience.
The telling difference lies in the frequency response window. The OnePlus Buds 4 span 15 Hz to 40,000 Hz, while the Galaxy Buds 3 FE cover the more conventional 20 Hz to 20,000 Hz range. On the low end, reaching down to 15 Hz means the OnePlus buds can theoretically reproduce deeper sub-bass — the kind of visceral rumble felt in electronic music or cinematic soundtracks — though most human ears begin losing sensitivity below 20 Hz. More practically significant is the high-frequency ceiling: 40,000 Hz versus 20,000 Hz. Human hearing generally tops out around 20,000 Hz, but a wider high-frequency range can reduce phase distortion and result in a more detailed, airier reproduction of the upper registers that are within audible range, particularly noticeable with hi-res audio content.
The OnePlus Buds 4 hold a clear edge in sound quality specs. Its dramatically wider frequency response — especially the extended high-frequency ceiling — suggests greater engineering ambition in the audio tuning, and listeners who prioritize detail retrieval and audio fidelity are more likely to benefit from it. The Galaxy Buds 3 FE, while perfectly competent for everyday listening, is spec'd to the bare minimum of human hearing range, leaving no headroom beyond it.