Thanks for the reply. I think I will go with wiring the ground to the negative battery post.
I just got my speakers amps and equalizer yesterday. Mounted the amp for the in boat speakers and then ran the wiring and hooked up in boat coaxials. I am planning on running the tower speakers sometime early next week along with installing the amp to power them. I am still waiting on my subwoofer(12 inch alpine type r) and when I get that in I will install it. Hopefully sometime next week also. I will post pictures on here when I get the system all wired and put In. I appreciate all the help that everyone has provided. Lots of great advice!