I have a Norge 1000, it also makes switch on and off sounds. I used it like that for about three years, without any problem, but recently added an eight audio speaker protection. I did not do any modification inside, but rather put the kit along with power supply transformer in a separate box outside the amplifier and run the speaker cables through it. I have multiple amplifiers all with internal speaker protection relays, but Norge does not have it. Though I listen at volume levels that do not cross the 10'o clock position in the Norge amp, still I do not want to take any risks of speaker damage and subsequent service headaches for the speakers, so I added the kit. But if I ever get separate speakers from the Norge stable, for the Norge amp, then I will remove the kit from the chain and can take the risks of speaker damage, as Norge is there to provide the spares when required, and the service can be done locally. But for speakers of other brands, spares and service can be a headache, for me.