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Audio Null Tests, Examples, Results, Metering

running a null test

General consensus, null tests are reported to be an accurate way to compare results. How do you make sure something really does null or not then? I've read most metering applications have issues to provide sufficient results for null tests. Example: the on board metering in many DAW's ignores all levels below a certain point. I found out that the only REALLY good metering/measurement is WaveLab and a few others. It displays all the way down to -144 dB. If this is true, the results of some null tests may not be true.
What do you use?

How convincing and how useful are phase cancellation comparisons?

What are some null comparisons worth doing?

  • running sources through different outboard compressors, and making a hard bypassed copy to phase reverse against the processed / compressed sound
  • How two DAW's compare ( pay attention on pan law)
  • Equipment Noise

Some links to metering:
Do you do null tests for mixing or mastering?

Heres some great info at DIY
http://www.diyaudio.com/forums/everything-else/13415-null-difference-testing.html