Hey - it is overload protected! (if you use the same standard fuses in Norway, as we do in Denmark). In Danish houses we usually have 10 ampere fuses in the "electric locker" (several of them to take care of different parts of the house - and some places more - like in the kitchen, where the stove will take quite a load of electricity). So take 230V and multiply it with 10A, and you have 2300W. Ok, the "house fuse" may be too slow - especially since it is PMPO (probably Peak Music Power - or something). It way be a total makeup, or they may have swapped the powersupply (already that is fishy), found the limit, for, what the transistors can handle for a spil second - and added the number for all the channels.
Maybe they even added the Peak power of the aplifer chanels AND the Peak tollerance of the Speakers - it all adds up
Oh yes, and the CD player will draw some current too
