Controlled testing 2013-02-19 22:30:11 I know bias-controlled testing is brought up when discussing amps, CDPs and cables, but the testing methodology itself is almost never explained in detail to the laymen - ie a step by step tutorial. I think it would great if people could do this kind of testing at home for themselves. My question is, is it possible for anyone to do or does it require extensive know-how to get right? Let's assume you wanted to test two amplifiers or two DACs - to the amateur, what is he in for? How complicated is the process? This thread is really just to outline what is required so that others can do the testing at home.