Without going into the theory of it (enough's been said in the previous postings) I can tell you that when I 'upgraded' from a very very good stereo power amp (Sim Audio's Celeste 4250SE) to a pair of Legacy monoblocs I felt, let's say a 20 % difference in sound. Pl. note I didn't say 'improvement', but a difference. I consider that difference an improvement but opinions may vary. It wasn't a very pure experiment of course because a) my speakers are Legacy and there may be a better match betw. them and the monoblocs and b) the monoblocs produce 800 into 4 each while Sim did only 500 into 4 per channel. Still, unless you want to go nuts and spend a lifetime on all this matching crap, etc., I think it was a good enough experiment. I stayed with the monos. Also pl. note that interconnects MUST be short, pref. as short as possible, because the signal that travels in them is low power signal and (if you take cable talk seriously of course) you can lose more of the signal in interconnects than in speaker wire (where the signal generated by power amps is very very strong). So, if you can't place all your stuff betw. speakers with short inteconnects and short speaker wire betw. monos and speakers go for short interconnects and longer speakerwire, which I did. And I'm very happy. Just don't lose the forest for the trees, that is music for the sound. Good luck.
