Ports mouth proximity to driver

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Joined 2008
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Searching on this forum and others , the vast majority of recommendations for placement of the port with respect to the driver say that within a quarter wave of the tuning frequency anywhere is pretty much the same.

However , in this thread it was noted by several members that where there were multiple identical drivers with one placed closer to the port than the other , the closer driver showed visibly greater excursion. However, the thread didn't appear to come up with an explanation for it , though one poster suggested that the closer driver starts to behave as if it were on an open baffle.

So the question is, is there such a thing as too close? and if so , where would the threshold be? Just asking if there is a known minimum safe distance from the driver for planning an upcoming build.

Thanks very much ! ! !
 
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