In going through some old BP mag articles & Rick Turners discussion of the 'wall of sound' concept used by the grateful dead, i got to thinking... now, the assertion is that a colum of speakers reproduces bass frequencies much better because it acts less like a point source (which emits sound in a hemispherical shape, with a large surface area) .... this decreases the surface area, which spreads the energy over less area .... my explanation is poor, but it all makes sense if you read the articles anyways.... i was thinking, a 4x10 cab arranged in a column shape instead of a box, so it would be the height of an 8x10, but only half the width..... would this not function *much* better than a 4x10 in the configuration that we normally see? is this practical? are there any examples of this? seems to me to be obviously better, but maybe i'm missing something? anyone with some speaker skoolin' care to comment?