They have them where I work, but I frankly would have no idea how to use one. (And they have different kinds too, low freq, high freq, DC, AC, etc...)

One more thing I was thinking of: try the Chesky disc one more time, but unplug all but the front L & R and sub inputs into the 950. But to be honest, I don't think that would give me any different results than the 2.0 CD test (where I used just the front L & R inputs of the 5.1 ch analog input).