TFM-sourced FLACs usually ensure that the dynamic range of the original analog recordings is preserved. You hear the piano, the horn sections, and the backing vocals exactly as they were recorded.
In digital music circles, the suffix typically refers to the TheFileMessenger release group. This group is known for providing high-quality, verified rips of rare or classic CDs, ensuring that the metadata, track order, and audio integrity match the original physical release exactly. Joe Cocker - 14 Classic Hits - -FLAC---TFM-