IPX6: Protection against Powerful Water Jets / Water projected in powerful jets, up to 12.5mm (0.49 inch) against the amplifier from any direction shall have no harmful effects. IPX7: Protection against Immersion, up to 1 m (3 feet, 3 inches) depth / Restricts harmful amounts of water entry when the amplifier is immersed in water under defined conditions of pressure and time, up to 1 m (3 feet, 3 inches) of submersion. IP6X: Effective against Dust-tight / Dust entry is restricted to avoid damage to the amplifier. A Drain Tunnel Structure is employed for creating a gap between the amplifier and the installation surface. This prevents salt water and sand from accumulating on the bottom, increasing corrosion protection. Salt spray-proof: ASTM B117 salt spray (or salt fog) corrosion test simulates harsh conditions in a saltwater environment to ensure the amplifier does not corrode or fail in these harsh conditions. By adopting the Corrosion-Resistant Sealed Cast Aluminum Chassis and stainless-steel screws resistant to rust and corrosion, this amplifier achieves the highest level of durability in its class. Vibration-proof: Vibration can be damaging to the amplifier if it is not designed to withstand it. This amplifier passes a 3-axis multi-frequency vibration test. The amplifier mounting section is made of 15/64 inch die-cast material to suppress the amplification of vibration. In addition, the thick heat-transfer sheet was also placed on the substrate and the Aluminum die-cast heat sink to suppress the vibration of the substrate. Thicker terminal connection points and increased wire size enables maximum current flow and higher output for better low-frequency response and cleaner output, resulting in powerful bass reproduction High-Quality PMLCAPs (Polymer Multi-Layer Capacitors) are utilized to lower distortion levels, improving the overall listening experience at higher volumes, while maintaining the integrity of the sound. Wired Level Water Proof Control Included