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On Mon, Feb 13, 2012 at 9:50 AM, andy butler <akbutler@tiscali.co.uk> wrote: > >> On 7/22/64 11:59 AM, Per Boysen wrote: > > >>> you might want to make the stereo perspective extreme, because there >>> may come sync sound and dialog in the middle. There are plugins to >>> broaden or narrow a stereo image but you can do it manually as well >>> (with better control) by setting up this routing matrix: Clone the >>> signal into three channels. Revers stereo image for channel one, phase >>> invert and lower the level a tiny bit for channel two and make channel >>> three mono. Now, these three channels is your tool to achieve all >>> kinds of stereo perspective, from the broadest that sounds wider than >>> physical speaker positions to a punchy and focused up-your-face mix, >>> and you get full mono compatibility in the package. The process also >>> opens up for tricks like processing different parts of the stereo >>> image differently (level balancing, EQ, compression). > > > hi Per, > any chance you can put that into equations? > In English, I can't even work out how you'd mix the 3 > "channels" to regain the original mix. > (or is that the point?) > andy > Hi Andy. The point is not to regain the original mix. The point is to change it a bit. The listening experience of a mix treated this way is better definition both for content and stereo image. The technical achievement is that the mix becomes safe for mono playback, meaning that levels won't come out differently in mono compared to hearing it in stereo. If expressed as a signal addressing scheme the workflow is: 1. Split the main output into three parallel channels. 2. Set up the processing for each one of those three parallel channels as explained above. 3. Merge the three processing channels into the final master. Here's what you do in detail by a more technical description: Ch A: Reverse stereo channels. Ch B: Invert phase. Now, when two channels of reversed phase play back through the same playback channel they nullify each other and the sum is silence. BUT here we made one of them stereo reversed, which means that only the audio that is mono - i.e. middle of stereo image - becomes nullified. Merging A + B gives us a "hole in the middle" stereo image. The deepness of the black hole and the width of the experienced stereo field depends on how you set the levels of these two stereo busses. My finding is that 1 dB lower for the phase inverted Ch B works best for the music I do (-1 dB that is). Now enter Ch C, the "monofied" split, and fill up that hole in the middle with this one. If the orignal mix is good this should stay at 0 dB as Ch A. Greetings from Sweden Per Boysen www.perboysen.com http://www.youtube.com/perboysen