These speakers hit hard. The bass echos across my boat. I installed just 2 of these woofers and have them behind a 400 watt amp. If I turn up the sound I can watch shoes dance across the floor of my boat by themselves. The speakers are easy to install with the template that comes in the box. Everything needed to install the speakers is included, except the saw of course. These speakers produce more bass than the 3 twelve inch speakers my friend has on his boat. They're better than I expected.