ok well i bought a RF 300x4 locally,fits right in my passenger compartment,looked up a lot of marine speakers and most of them ar 6.5inch and up.
and i tested this 3 1/2 inch speaker which is about 2'' deep and it fits good,i can prolly fit a 4-5.25 inch speaker.
so ima hit up a shop today to see what fits and what doesnt.
everythings hooked up but i still need good sounding speakers and a smaller line driver to increase my voltage output,portable MP3s dont have any V output which would force me to have the gain high/volume max and still not be loud enough,while making the amp run hotter,speakers/signal distorted/clipping (all bad)