HU cutting out at high volume....
sorry for the long post...........
There are a number of possibilities depending on your configuration. For example, if the previous owner left the original speakers but rewired them directly to the head unit (bypassing the Monsoon amp), you could be running 2-ohm speakers on a head unit that isn't 2-ohm stable (when you turn it up, it shuts off because of excess current flow).
thanks






