If the batterys are completly different in terms of power output then I can see Eric Johnson's point, which isn't worth mentioning in the first place. I do appreciate the man's genius and ear for great tone but...
well, that's all there is to it to be exact... well, there's also consistency of output, as some batteries last a while longer, but that's everything that's worth considering.
It would be a really interesting test to do in a double blind with some really high end gear, mixed in with medium and low end gear and one part changed at a time. Blindfolded listeners, obviously. Cange source, amp, speakers, cable and see what changes can be idetified consistently and how much difference each makes. I'd love to see that test.
problem is.. you cant remember detail. especially the minor ones and because of that, one component might seem identical as another, even though it might be of lower quality.
to see/hear the real difference, you have to have two identical systems, one as a reference point, the other as the testing one, then change one part at a time in the test system and compare the changes back to back. only that way you'll be able to hear a change in the details that appear (or dissapear)
to add something to the defense of coat hangers. it really is just wire. really thick wire, that lets quite a load of current through, with near to zero resistance, so they might aswell sound decent
