The Null Tester

Some audio enthusiasts believe there may be more to audio fidelity than is currently known, and they insist that signal wires and other audio devices can measure the same yet sound different. This video explains what a null test is and how it works, then uses a custom made Null Tester device to compare RCA wires ranging in price from a few dollars to $700. Rather than measure wires directly, the Null Tester isolates all differences between signals passing through the wires, then lets you assess and hear onl