Okay let me see if I can sort this out somewhat without getting into technical terms to keep it simple.
First the Kenwood KMR-M312BT receiver. Yes it has spec listed as 22 RMS watts per channel and 50 watts peak per channel. That means you will be able to supply 22 watts of basically clean sound power from 4 channels. The four channels are left front, right front, left back, right back. That is the same as most every receiver does. So it is a basic setup. The Boss MR404 4 channel amp is basically allowing you 50 watts of clean sound power. While that sounds like a huge increase of sound ability, it really isn't. It will allow you a little more sound DB (a little over 4db) or volume but nothing too much more then the receiver itself. As for the speakers, the specs for them are simply telling you what they can handle in wattages. The ones you have listed will handle more wattage then your setup will ever output so no worries there. So to sum up what you actually have is a standard good receiver that will output 22 wattage of clean listening power and if you install the power amp, that will increase your sound volume by a few db more meaning the volume will be about twice that of just your receiver. But twice the sound isn't as impressive as you think. The saying goes, if you can hear a increase of volume, you increased the power two fold. So yes the amp will increase your volume but not as much as you may think. So you have a little more then a standard receiver setup for your boat... If that is what you wanted, then there you go. But please remember that when you are listening to your new sound system that others on the water will be able to hear your stereo as well do to the fact that sound travels so much further on water then on land because of the trees buildings and such. So please keep that in mind and show some responsibility and courtesy to others...
