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the "pan" array isn't even an array in the sense of a true "speaker array" the way it is professionally used as a term.
The word "array" means a 2 dimensional arangement of nodes. so "technically" it is an array of 2 inch speakers but it doesn't qualify as a "speaker array" in the way a real speaker array does.
a array has a constant-curvature single-horn assembly accross multiple perfectly aligned (single axis) High Frequency drivers. This is very important for phasing issues.
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Bill-
Not nitpicking but I have to disagree. This IS a semantics issue, me thinks.
Column speakers have been classified as "linear arrays" for decades, probably back to when Harry F Olson first described them in a scholarly fashion in "Elements of Acoustcal Engineering" in 1940.
I know that elsewhere in the physical sciences there are "linear arrays" of various devices. (wish I could recall a good example) I also know (I agree with you) that groups of devices in 2-dimensional arrangements are also referred to as "arrays". Perhaps somewhere long ago the term was bastardized. But not by Bose.
We (the professional live sound industry) often use the terms "array" and "cluster" interchangeably. In my mind an array is more likely to be linear whereas a cluster is more likely to be 2D. But maybe that's just me.
I have always been a proponent *and* harsh critic of Bose and continue in that vein. Most, if not all, of their "white papers" are nothing more than marketing hype and much of the very slick, marketing crap they have done on the MA12 and the Personal PA (or whatever they now call the variations they have on this column speaker) in particular is pure rubbish filled with gross exaggeration and blatant (factual) distortions.
None-the-less..... the MA12 (and its cousins) remain perfectly usable and/or justifiable devices for specific applications. Provided you undertsand what they can and cannot do. This is obviously also true of the multi-band line arrays that are used so widely now in concert sound, etc.
Having said that ....... JBL's new CBT series clearly appears to be a substantial leap upwards in taking the initial/simple concept and improving upon it and the behavior of similar (in size, shape and cost) column speakers. Inluding the curvature you mention which (in the CBT series) is achieved through passive phase manipulation. Very cool stuff.
See:
http://www.xlrtechs.com/dbkeele.com/CBT.phpand:
http://www.jblpro.com/catalog/general/ProductFamily.aspx?FId =89&MId=2
When I first demoed these and did some measurements I began to think of them (the 100LA in particular) as "MA12 killers".
FWIW