I just got a new pair of Studios 60 a few days ago but i'm not very pleased with them. At the beginning,they sounded clearer,crisper and more powerful than what i hear now. Yesterday i was listening to some music when suddenly in the middle of the song the sound got much lower and weaker. You guys have an idea why all of this is happening? By the way,i'm driving them with the Pioneer 54TX which is 100watts/channel.