Sum & Difference Monitoring Explained



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    Yvonne Lynch

    way too technical - I was advised to buy iD14 to make sure audio interfenec was eliminated -no joy, after having a detailed conversation with Daniel Mills. I am using Windows 7, have a Perception 120 microphone. After treating my recording space with acoustic foam, padding etc, I am still getting interference in my bog-simple simple recordings,
    Any help/advice would be gratefully received.
    Yours, Yvonne Lynch

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    @ Yvonne : amongst various sources of interference, you've some that are dispelled by the very design of the iD22 (perhaps that's what led you towards it, as you wrote ''make sure audio interference was eliminated'') ; other can hardly be removed by a snap of the fingers (if you set up around an airport, for instance). Many of modern-life interferences [due to a variety of media] can be cut-off by applying a low-pass filter @ 20khz (& even lower depending on the contexts) ; but please note this only matters for acoustic/real analog takes, it's useless for digital-bred sounds. / / / Now from the foregoing you can leave electro-acoustic lore for later, and remember that 'S[umming into mono]' can can be of help in your struggle against interferences... Indeed, in the late stages of sound production, some residual interferences (either because of monitor crosstalk, group bleeding or single-track IMD) might go unnoticed in one's usual configuration ; those can be monitored by using the 'S[igma]' on iD22 software board. At you fingertip over iD22's 'system' panel is this 'S' (i.e. the 'sum into mono' framing explained above), for you to hear sorts of overlapping, yet-to-improve-frequency-coupling + you got an insight @ what is called 'phase space', where your different inputs relate to each other, especially paired contents. Interference you mention might also come from 'ground-loops' & other electrical issues. Vielen glück!

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