How to measure sub-audio time delays with a PC

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http://forum.allaboutcircuits.com – A description of how to do this is in the attached PDF. Please accept apologies for submitting it like this, but I do not know how to do it otherwise. Since writing this document I came across a post that told about "Phantom power" from the sound card mic input connector. That is something I never knew about so I did some extra "snooping" at the mic input of my Compaq laptop. I use a DT830D DMM for my measurements. When there is no recording device active on the PC, there is no output from the mic connector. When a recording device is active then 3.6 volts (no load) is (Embedded)