48kbps M4a(-1 B) 99%

: At 48kbps, you can expect a high-frequency "roll-off" around 11–13 kHz , which is sufficient for clear voice and background music, though some "underwater" artifacts may be audible in complex tracks.

When M4A files are encoded at low bitrates like 48kbps, they typically utilize . A specific feature of this technology is Spectral Band Replication (SBR) : 48kbps m4a(-1 B)

: It then includes a small amount of "helper" data that allows the player to reconstruct the high frequencies during playback, simulating a full-range sound. : At 48kbps, you can expect a high-frequency