Got started on the audio upgrade to the base system tonight. Step 1, add bow speakers. I decided to grab another pair of Rockford Fosgate 6.5" Coax RM0652 to match the factory cockpit speakers. (FYI, a seller on ebay accepted my offer of $75 w/ free shipping for a new set) Other than tools and tape, nothing else was required as Sea Ray was nice enough to include the upgrade prewiring connected to the stock head unit, including standard female spade terminals. Taped them off, found the center, drew a circle, cut em out, and screwed them in. (make sure you use a shop vac for dust control)
Very worthwhile 1-2 hour, $75 upgrade for anyone with the base 2 speaker system.
Excuse the poor pics, getting dark by the time I finished up.
FYI all - I did this same upgrade based on the above. Did the exact same thing, made a $75 offer on eBay, prewiring was in place. Super simple and makes all the difference in the world, as there is no hearing the rear speakers up front. Thanks for the idea GATORB8!