| Re: Trapezoid enclosures [message #43886 is a reply to message #43885] |
Mon, 09 February 2004 10:05   |
Larry Acklin
Messages: 54
Registered: May 2009
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Baron |
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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.
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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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