Some amplifiers have a built in protection circuit that trips in case of overload. Does the 2150 have one?

I did respond to your last post about acceptable loads for the RR2150. While the unit does have a protection circuit, this doesn't mean you cannot damage your unit by overloading it ( excess heat generated by less than supported impedance or any other means). If you have any further questions, we would be glad to assist you at (866) OUTLAWS.