"Do you mean the specs that are printed on parts - like relays - should
be respected?

What an odd idea! "

I am old and have funny notions like that.

But I do have to admit to putting foil on the fuses in my amp so it could drive 2.3 ohm loads. One eight ohm and one four ohm per channel in parallel. Actually, never blew the outputs, it didn't even get that hot. Sansui 771.