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The Story about a 0.01 Ohm Resistor - Part One

Twenty odds years ago, I saw an audio electronics practitioner, who was my tutor, setting up a pair of speakers for a customer. At that time, I already have basic knowledge on setting up speakers and successfully built several pairs of speakers. I saw him using long chains of resistor to level the mid-range and tweeter. The chains of resistor consisted of various values, but strange enough, I found some values as small as 0.01 and 0.05 ohm.

I was curious as to why standard values couldn’t be used. He told me that standard values such as 0.1 ohm was far from ideal for setting up speakers; in order to achieve best accuracy 0.01 ohm was required. He also stressed that when perfect balance was achieved, either adding or removing a 0.01 ohm resistor would spoil the perfection and it would sound distinctly bad upon comparison.

Although he was a very experienced audio practitioner, I was very doubtful about his theory and had a lot of questions. Why I haven’t heard about that before? Why hi-end speakers weren’t built that way? Were human ears so sensitive to be able to distinguish the difference made by a 0.01 ohm resistor (equivalent to a piece of wire) on a tweeter or mid-range?

If what he said about cross-over leveling was true, all cross-over in commercial speakers would be inaccurate because only standard value resistors were used.

Guys, what do you think?


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