DS18 HYDRO MP4 4″ 2-Way Marine Speakers 150 Watts (Pair) DS18’s reputation and products continue to dominate the marine and off-road scene with our innovative brand of marine speaker, the MP series. The MP line of marine speakers is a true sight to see! They come in 2-way configurations and carry an IPX5 waterproof rating, so you know they are durable for the elements. These speakers produce a very full and rich sound that is very hard to replicate in open air environments like out on the water, but DS18 does it flawlessly