Review on 6.5-Inch Dual Waterproof Marine Speakers - 400W 4Ohm Outdoor Car/Boat Radio Stereo Speakers | Waterproof & Weatherproof Marine Stereo Speakers System Pair | Mounting Kit, Speaker Wire, Grill | Lanzar AQ6CXW by Robert Lewis

All speakers fit nicely in the standard cutout in my boat. I have a cheap 1000 watt Vibe amp and a cheap marine grade Boss deck that drives them. I think the RMS value for them from Vibe is probably around 200W each. They sound amazing! I ran all the thick power, ground and speaker wire. Probably not enough amps for them, but this was an inexpensive boat system that I only use about 10 times a year. They don't distort the volume up to about 75%, which is easily audible at 75 yards. Considering they have such heavy magnets I think they could handle twice the force.