02-07-2020, 10:40 PM
my 43 Open had an Onan 3600 RPM screamer (mdkwb) and the sound shield made a very big difference. Current boat has an 1800 RPM Onan and the sound shield doesn't make as much of a difference but is still nice to have. Sounds like as Misdirection described, a low hum.


![[-]](https://www.tiaraownersclub.com/forum/images/netpen-pro/collapse.png)