Posted by Larry Acklin [ 64.179.115.90 ] on February 09, 2004 at 11:05:48:
In Reply to: Re: Trapazoid enclosures posted by Chris R on February 09, 2004 at 10:18:29:
From--
http://www.atr-treehouse.com/PA10.html
start quote
BOX DESIGN SHAPE - Trapezoidal vs. Square
The reason for that "wedge-back" trapezoidal enclosure geometry is to facilitate the creation of semicircular arrays
where multiple enclosures are arranged closely side-by-side. Created initially for "flying" in elevated clusters,
trapezoidal enclosures have also found their way onto stages all over and are used in small numbers with great
success.
Their shape looks a little horn-like leading sometimes to speculation about them having "longer throw" than similar,
square enclosures - of course we know better now. However there is a potential benefit in this shape - when
properly configured, it reduces internal standing waves which means smoother frequency response and possibly
improved phase coherence, a factor which gives the enclosure a "tight","focused" sound. On the other hand, not all
trapezoid boxes automatically benefit from this shape, nor do all square boxes fare less than favorably in
comparison to them.
end quote
So in an array- better coverage, about 3 db gain by stacking close together, and a possible standing wave issue. Plus they pack better in the trailer.
-Larry
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