AudioPrism Ground ControlPrice: $149.99 per pair


Doug said: There are many positive comments out there about AudioPrism’s Ground Controls, from reviewers and others who have already experienced them. My system, however, didn’t benefit from them, nor did a very different system. The Ground Controls indeed altered the sounds of both systems, but nothing I heard could be called a worthwhile improvement.

Read the Ultra Audio review.

The gist: Pass on this one.