Summary: For the price they are great speakers. I would recommend these for a stock radio. They have a surprising good sound and good base. They come with stainless steel hardware, a real plus with salt water. The front grill is separate from the speakers and snaps on to hide the mounting screws. I will be adding a second pair of Alpine speakers to our boat, I will be buying the larger M700 for my second set. I did not have the room to put the M700 for my replacements speakers.
Summary: Very good speakers. Good amount of bass for just running off the head unit. Also very clear at high volume I've had several other brands that would crackle and sounded horrible at levels I can play these at.
Pros: Very durable and water has yet to hurt them.
Cons: Comes with a silver cover so I painted mine white to match the boat.
Summary: I installed these in a 2003 seadoo sportster 155. They fit right in the hole for the old speaker, but I did have to drill new holes for the screws which took 2 minutes. They sound really clean and are loud enough that I can hear my music at full throttle. I also bought a clarion m303 head unit. Very happy with the purchase.
Summary: In the marine 6 1/2 inch speaker category, these speakers are by far the best on the market. I have used everything from kennwood to JL, and the Alpine's are the best. Bass is fantastic for a 6.5 inch speaker and I have a set in a stereo cooler that floats in the lake and down river every year and they are still performing beautifully!