Summary: These things are pretty loud and produce an excellent amount of bass and highs. I have a couple go-to songs for evaluating any speakers compared to my two vehicles with full sound systems. Obviously these don't hit like a component system with sub, but they're very much so adequate. Can't really beat them for the price - quality is there in terms of sound and construction. Put these in a Dewalt 24" tool box with a Lepai cheapo amp, shakes the floor of my living room.
Summary: Replaced a set of Aquatronics with these. Much fuller sound range and quality. Installation was a breeze with the included template (old speakers had a smaller footprint). Love that it came with a gasket...adds a water resistant quality to install without having to use sealant. Sound quality isn't amazing (it's very "bassy") but it gets very loud with only a 50W stereo pushing them. It's nice to hear the music over my old two-stroke.
Conclusion: Out of the 3 pairs of 6.5" waterproof speakers that I have mounted into a cooler as a tubing sound system, these are by far the best sound and performance. I have about 18+ hours at almost full gain from a plye 400 watt amp without an issue. The only thing that I did not like about these speakers is the plastic housing on the magnet is larger than the other 6.5" speakers that I own. After a little trimming they fit nicely.