Mp3(-1 B) — 48kbps

Ideal for long-form voice recordings where storage space is limited but clarity of speech must remain high.

The "B" suffix often refers to CBR (Constant Bitrate) or a specific bit-reservoir management behavior. At 48kbps, using a constant bitrate ensures the file size is perfectly predictable, which is essential for certain legacy hardware or streaming applications. 48kbps mp3(-1 B)

This is considered a "low bitrate" setting. It is generally used for speech-heavy content like podcasts, audiobooks, or talk radio where high fidelity is less critical than small file size. For music, 48kbps often results in noticeable compression artifacts (a "metallic" or "underwater" sound). Ideal for long-form voice recordings where storage space