Not when used with the recommended bluefish controller.
The loudest part of the Marine-Pac 3 is the cooling fan on the light.
Without a controller the light will operate both channels at 100% and the fan will run at full speed. The speed of the fan is set by the intensity of Ch1 (whites) on the lighting controller
If you require quite operation you will need to use a bluefish controller and set the light intensity for ch1 to around 70%
At these levels the tank receives a massive amount of light but the fan is almost silent.
At night when just the blue channel is running the fan is inaudible.
The skimmer is almost completely silent,