Summary: I bought a set of the 5s last summer for a custom install in my Ultra Classic lowers. Sad thing is that they sound better and louder than my 4" Boston Acoustics in my dash. Marine grade is the way to go every time!!! Buy them you'll love them!!
Summary: Mounted these in the rear position in my corolla wagon... It's amazing how efficient these polks are, and even the little 4" ones sound great...nothing but a Pioneer head unit hooked to them, but nearly too loud for my aging ears!
Conclusion: Excellent speakers for someone who needs a good sounding coaxial in a small installation space. Took me quite a bit of customization, but as I have a Toyota Landcruiser, I expected as much.