This is an interesting topic, the whole pan rule. And I for one don't quite get it, I hear it, though.
In Sonar we can change the pan rule I generally set mine to the 3db pan rule and I can hear it. I have read something about head room as well, setting it to 3db gives you more headroom, please feel free to shoot me down here.
On the SSL consle they use a 4.5 Pan Rule and from what I understand it's all to do with imperfect rooms and perfect rooms.
Maybe someone can chime in here, anyway here are two articles I have read on the matter: http://www.rs-met.com/document.....nRules.pdf
"In search of the lost digital chord"
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Ben BCT (Bachelor of Creative Technology, JMC Academy) MMusTech (Master of Music Technology, The University of Newcastle)