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Re: Vertical array vs trap arrays

Posted by Centauri (P) on December 9, 2004 at 02:30:28

In Reply to: Vertical array vs trap arrays posted by DSM on December 8, 2004 at 09:43:47:

Trouble with most trap boxes is the coverage angle varies with frequency, especially around the crossover point. When trying to horizontally array them it is impossible to prevent overlap at some frequencies causing cancellations (dropouts) and dead areas at other frequncies where there is a gap in coverage. The effect is VERY noticable when walking across the front of the stacks. The only way to horizontally array is to have very tight dispertion control ie, well designed waveguides (therefore horn loaded boxes). Martin got it very close with their W8 system, but the Funktion-One Resolution boxes have perfected it. To get high spl, the coverage pattern of each box must be narrow, which is difficult to DIY (the Resolution boxes get 25degrees ! - I'm currently trying to get down to 40degrees and that is hard enough).

The vertical array works easier as off-axis (in the vertical plane) cancellations get swamped by the summation of close drivers. Only thing is the horizontal dispertion is only as good as one box, which quite often is not wide enough.

Both systems have their merits and applications but require good design to achieve best results - the vertical array is probably easier with DIY boxes.

Cheers
Graeme

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