I've noted the many threads in which the B string in particular and low notes in general are described as muddy and solutions are sought. I've wondered about disagreements over the same model bass and in general have assumed that getting a tight sound meant hearing less of the fundamental and more overtones. I'm reading "This Is Your Brain on Music" by Daniel Levitin. He writes, based on laboratory studies, that most people have difficulty hearing pitch definition below 55hz and above 2000hz. In the continuum of pitches there are tones too low to hear at all, tones we don't hear clearly, tones we hear clearly, higher tones we don't hear clearly and higher still tones we dont' hear at all. In addition, not all hearing is equal. Some may hear a 37hz D fairly clearly while to others it may sound muddy, despite accurate sound reproduction. Good read and a good reminder that when we have different opinions about a low note being muddy or clean it may be due to the end sound produced or it may be because of different abilities to hear the tone.