Sony 600 Watt 4 Channel Marine/boat Amplifier
After getting my boat with the factory head unit and speakers in it, I opted for sony's marine unit to add capability to the boat for using ipods-sirius-mp3 discs etc.  That went great, as I could use many new modern devices, but the sound was terrible with my 2 little 25 watt RMS speakers.  So then I dropped in some new polk (100 watt RMS) speakers.  Much better sound but now the head unit couldn't push enough power to the speakers and the unit would start to clip the sound at higher volumes as it struggle