So, Drew hooked me up with some 6.5" Polk DB675 cabin speakers for a price I couldn't turn down, so I finally upgraded the stock 6" Kenwoods that are 13 years old. Took some work to expand the holes, but well worth the effort. What better to do on a rainy July 4th?

So here's a pic of the old rear speaker

Remove the housing from the boat

Remove the speaker

Put the form over the opening and mark it for where it needs to be cut out