GregTech: New Horizons, usually shortened to GTNH, is a long-form Minecraft modpack built around GregTech, a technology mod with roots in IndustrialCraft 2. Its progression is organised by voltage tiers, and HV, or high voltage, is the stage where power systems and machines become considerably more demanding and capable. Sounds tied to that tier are shared by players documenting bases, automation and progression, especially in gameplay clips and modpack showcases. They remain useful because they immediately place a clip inside GTNH's tech-focused progression without needing an explanation.