A quality master fuse is not a luxury, it is essential to a safe installation.The purpose of an audio system's master fuse is to protect the vehicle from fire in the event that the fused power wire is damaged in a collision or via accidental short-circuit. A cheap quality fuse will not only degrade your system performance by creating excessive resistance in your power wire, but it can also be a safety hazard if it is inaccurately rated. JL Audio ANL (large blade) and Genuine Littelfuse® MAXI® Fuses are built to strict standards and are designed to maintain low resistance under your hood. Fuses feature high-temperature insulators. ANL fuses feature a bright nickel plated finish.