I hear that there are at least two kinds of circuits in modern audio amplifiers solely for the purpose of protecting the speakers against excessive loads on powering on and off.
Particular function of these circuits is delaying the connecting of speakers so long that there is reasonable probability of the amplifier to have become stabilised on powering on; and disconnecting the speakers prior to powering the amp off.
The effect is that neither on powering on or on powering the amp off the speakers produce a loud pop or boom, as the simpler older amps used to do.
My question is how exactly are these circuits called and what is their typical setup.
Background: I have two Behringer EPQ304's, and one of them always pops on powering off, and my googling produced little insight so far. English is my second language, so perhaps I've missed the proper names. But I'm interested in the design as well.