I apologize if this is a stupid question, but apparently I'm slow and am having a hard time getting my head around this.
Conventional wisdom as expressed here is that Blumlein doesn't work well up close, but m-s does. I also understand that Blumlein can be setup in two ways:
1 - 2 fig 8 mics with the "V" in the angle of the mics pointed at the center of the stage, or
2 - in an M-S config using 2 fig 8 mics. This decodes into the exact same result as setting up using method 1 above.
So if we conclude that blumlein is not good upclose, but m-s is, then the ultimate conclusion is that m-s using a cardiod pattern as the center mic works up close, but the same m-s setup using a fig-8 center mic does not work well up close.
I still don't understand why though. Is it because the fig-8 front lobe is too narrow to work up close?