I took delivery of a new Marlow Hunter 40 in June 2018. It was a factory direct order so I had a lot of flexibility with options I ordered with the boat. The Fisher Panda generator that was originally planned for the boat has been redesigned and would no longer fit into the compartment, but MH suggested using a NextGen 5.5 without the manufacturer’s sound enclosure. Marlow Hunter custom build an enclosure around the generator and insulated it with sound barrier panels. The generator works well and easily handles the load for both air conditioners, but the noise is unbearable in the aft cabin. The generator is installed on a shelf under the port combing behind the cockpit lazerette. There is an inaccessible empty compartment directly under the generator shelf with a common wall in the aft cabin that resonates like a base drum. The boat is out of the water and I started tearing apart the enclosure MH built this week with the goal of securing and sealing all of the poorly constructed enclosure wall panels, cutting a large removable wall panel in the aft cabin to access the empty compartment under the generator, and install a lot more sound barrier and sound absorbing material around and under the generator.
I noticed your boat is in Rock Hall, MD. My boat is at Oak Harbor Marina on Rock Creek directly across the Bay from you in Pasadena, MD. You are welcome to come take a look at the generator installation.