If one earbud is completely silent, check charging and reset (AirPods) or coupling (Galaxy Buds); if it is only quieter, check debris, ear tips and the balance setting. The order and model differences follow Apple and Samsung's official guides.
The 7 in IP57 is a 1 m, 30-minute immersion item, not a water-jet item. Apple and Samsung both say IP57 and IPX7 earbuds are not for showering or swimming. AirPods Pro 3 and AirPods 5 are, however, not on Apple's "don't submerge" list.
Bluetooth codecs move anywhere from 160kbps (LC3) to 990kbps (LDAC) — a sixfold spread. Measured against a 1,411kbps CD stream, SBC keeps 23% of the original and even LDAC's top mode keeps only 70%.
The 30dB in ANC marketing is an average below 1kHz. Apply 20dB of attenuation to a 90dB subway car and 70dB remains, feeling about a quarter as loud — here is attenuation converted into perceived loudness, and where passive isolation takes over.
Bluetooth 5.4's new features — PAwR and Encrypted Advertising Data — were built for electronic shelf labels, not audio. What actually changes sound is LE Audio and the LC3 codec. Here is the real 5.3 vs 5.4 difference, straight from the official spec documents.
Codec specs come up often when choosing wireless earphones, but how those differences play out in real listening environments is rarely well explained. Here is a clear, spec-based breakdown of how LDAC, aptX, and AAC diverge on bitrate, latency, and device compatibility.