Why does the volume change from channel to channel?

The volume changes from channel to channel primarily due to differences in audio mixing, mastering levels, and the dynamic range of the content. Each channel may use varying compression techniques, equalization, or effects that can impact perceived loudness. Additionally, the source material itself—such as music, dialogue, or sound effects—can contribute to these volume discrepancies. Lastly, broadcasting standards and settings may also influence how audio is processed across different channels.