DS18 HYDRO 4-Channel Full Range Digital Marine Amplifier [NVY-IPX7.4]HYDRO 4 Channel Full Range Digital Marine Amplifier The NVY series was manufactured to put power back into your hands whether youre out on the great blue or maneuvering on the dirt path less traveled. Our latest amplifier added to this series has an IPX waterproof rating of IPX7, giving this fortified beast of a machine the ability to be submerged in water as deep as 1 meter for up to 30 minutes. It also has a 2 CH 4 CH input selector giving you