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. While this single Amplified Tube will surely deliver the unprecedented performance you demand, if just you want MORE, simply connect a Passive Tube (sold separately) to the optional speaker level output and DOUBLE your BASS. As with all Bazooka Bass Tubes Enclosures , the BTA8250D comes with straps to keep the sub securely mounted, while still making removal quick and easy if you need even more cargo room. Optional Chrome-Plated UMS Brackets give a flashier look, as well as a more secure, permanent mounting when removal isn't a problem. 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. Features: Patented Bass Tubes enclosure design 8” High efficiency woofer Class D amplifier technology (200W RMS @ 4 Ohm / 275W RMS @2 Ohm) Optional Speaker Output for a BT8014 Bass Tube View DEMO.