Introducing our first ever Class D amplified tubes. With 250 watts of pure digital power, and optional speaker level outputs these new Amplified Tubes are the most powerful and best sounding Amplified Tubes we've ever made. And now it is available in a Marine version. All our marine tubes come with the following features: Waterproof woofers Stainless steel hardware Weather resistant velcro reinforced mounting straps Also all marine tubes are salt fog and UV certified.