Hey Ben, I'm not familiar with either the SACD or Mastersound (mine is the Columbia/Legacy), but...the details that you mentioned (fingers on strings) are the sorts of details that tend to rise to the top and become more audible the more a signal is compressed. Compressing the bass *could* produce the differences that you noticed. I'm not saying that's necessarily the case in this situation, but it's ALWAYS possible with modern redbook CDs (the labels have all gone compression crazy). One way to tell if that is the case is to listen to the dynamic range of both. If one is compressed more than the other it will not have the same range. Of course, a compressed signal could sound better. It all depends.
By the way...were you playing the redbook CD on the same machine, or a nicer CDP?? If you used different players, the difference could be due to better redbook CDP vs. cheap Sony SACD circuitry.
By the way...were you playing the redbook CD on the same machine, or a nicer CDP?? If you used different players, the difference could be due to better redbook CDP vs. cheap Sony SACD circuitry.