Originally Posted by John Willett
Agreed - the Blumlein set-up is XY figure 8s.
This was told to me in a lecture a whie ago and we were viewing the original films of Alan Dower Blumlein doing the stereo "walking and talking" tests.
But I said that he was using two fig.8s in MS which matrix to XY fig.8s.
In fact I would be surprised if he didn't prefer this method, as you have a mic. pointing directly at the centre of the action and this matrixes to perfect "Blumlein" - you also have the added advantage that if you alter the side level the pattern widens or narrows, but without any change in the shape of the figure 8 pattern.
Guys, OK, help me out here. I am working with a Pearl DS 60. Four cards which can be used as the Blumlein MS by flipping one channel for the fore and aft and one channel for the beam to beam (LR). Fine. It works, I have tried it. Now what I read says this decodes
as a true Blumlein array. And if what I have read here is correct, I can widen or narrow the sound field without changing the shape of the figure 8's I have created out of the four cardioid channels. I am assuming I do this by varying the gain in the fore and aft simultaneously or in the beam to beam simultaneously. Is this assumption correct?
This would allow me to almost crowd the soundstage with the Blumlein MS and then pump up the gain on the beam to beam (LR) channels to effectively widen the recorded soundstage, or am I all at sea here? Reducing the LR signal would then, conversely, reduce the effective recorded soundstage, yes??
I can also dink around with it in the Schoeps DMS plugin. I just have not quite gotten my head around how to run that as four channel and have it come out as Blumlein stereo, two channel. Further poking around and maybe a re-read of the tech literature. RTFM!
Any light you boffins/propeller-heads can shed on this would really help.