Perceived loudness discrepancies between Deezer and Spotify typically stem from how each platform handles audio normalization and dynamic range compression settings. By default, streaming platforms apply loudness normalization to ensure a consistent listening experience across different tracks, aligning them to a specific target level (usually around -14 LUFS). If Deezer appears louder, it is frequently because the user has disabled the app's normalization feature, or because its high-fidelity and lossless FLAC streaming tiers preserve the raw, uncompressed dynamic range and master audio peaks of tracks. When dynamic range is less aggressively compressed or normalization settings differ between app configurations, the audio output can present with a punchier, more robust acoustic presence than Spotify's compressed streams.