An improvement... The Muses02 is much more natural and dynamic than the stock LME49720. This original is a nice opamp for its price but if you pay ten times more for the Muses02, you want get 10 times more music. NO... the change to the Muses is ok if you like more the natural sound of music. Even if you watch a movie the voices are there like they should, and sub is more controlled. A serious upgrade. Regards