NW-A45

The NW-A45 is an A Series Network Walkman with 16 GB storage supporting APE and MQA playback along with MP3, WMA, AAC, FLAC, ALAC, AIFF, and Linear PCM. A lithium-ion battery delivers up to 45 hours of use with digital noise cancellation and S-Master HX. It continued the 11th-generation A Series high-resolution focus.

The A45 is part of the phase where the A Series had become Sony's most dependable compact premium Walkman line. By this point the branch felt extremely sure of itself: compact, high-resolution-capable, long-running, and clearly aimed at listeners who wanted something more serious than the entry-level models without stepping up into ZX territory. What matters here is not reinvention but polish. The A45 reflects Sony refining the dedicated non-Android A formula into something very stable and very hard to misunderstand.