The below Article by P. Gagnon (Texas Instrument) and V. Kraz (OnFILTER) in Evaluation Engineering Magazine, 2002 explains how important grounding is in reducing noise levels. "It was kindly provided to us by Bondline to reference".
At A.L.A Audio we are currently working on several products in R&D that focus on reducing ground noise in the hi-fi chain, and let me tell you, so far the results are staggering and need to be seen to be believed!. More to come very soon! enjoy the article.