This usually indicates a specific revision of the preservation project. Enthusiasts continually update these releases to sync the audio perfectly with the film frames, remove pops or clicks, and ensure the 5.1 surround sound channels (often mixed down or preserved in high-fidelity stereo/surround formats) match the exact theatrical audio dynamics.
: A private community often cited for hosting rare film scans and "grindhouse" style preservations (requires an invite). thematrix199935mm1080pcinemadtsv20 high quality