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Eaw anya
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<blockquote data-quote="Jon Waller" data-source="post: 105185" data-attributes="member: 825"><p>Re: Eaw anya</p><p></p><p>After looking again at your shot of the two hangs, I wonder if part of the problem with what you were hearing has to do with the dual hangs. One of the hangs appears to point at 90 degrees to the stage lip, i.e. straight out. The outer hang appears to point 60 degrees out from that. So the main lobe of the combined system at low mid frequencies is pointing at 45 degrees offstage. It depends on what frequencies you call low mids (the classic definition of midrange is 250 to 2500 Hz), and what the crossover frequencies are, but at some frequency band the horizontal dispersion of a single hang is probably wide enough to interfere to some degree with it's neighboring hang, but yet the spacing between the outer 'wings' of the combination is wide enough so that the combined system lobe is narrowed. The result at FOH position, which appears to be in the middle, 20 to 30 degrees inward from the inner hangs, and about 60 degees inward from the resultant combined main lobe from both hangs at lower mid/upper bass frequencies, could be as you described.</p><p></p><p>I would expect this effect to be not much more than -6 dB, probably less, since worst case the innermost and outermost lines of 15" drivers would be out of phase, but the middle two lines of 15s would be acoustically close and therefore have wide dispersion. Besides applying some boost at appropriate frequencies, the next step to improve the situation would be to rotate the combined array inward. Further tweaking could be done by modifying the magnitude and/or phase of the innermost and/or outermost drivers in the DSP. Improvements in the center of the venue would probably result in degraded performance at other positions, however.</p><p></p><p>If 'conventional' line arrays were used, either a single hang would not adequately cover the outer edges of what appears to be a wide venue, or dual hangs per side would have variable spacing from top to bottom due to their bananna shape, spreading out the bandwidth of the interference and decreasing it's depth. Whether it would be more pleasant to a listener in the overlap zone between the two is open to testing and debate.</p></blockquote><p></p>
[QUOTE="Jon Waller, post: 105185, member: 825"] Re: Eaw anya After looking again at your shot of the two hangs, I wonder if part of the problem with what you were hearing has to do with the dual hangs. One of the hangs appears to point at 90 degrees to the stage lip, i.e. straight out. The outer hang appears to point 60 degrees out from that. So the main lobe of the combined system at low mid frequencies is pointing at 45 degrees offstage. It depends on what frequencies you call low mids (the classic definition of midrange is 250 to 2500 Hz), and what the crossover frequencies are, but at some frequency band the horizontal dispersion of a single hang is probably wide enough to interfere to some degree with it's neighboring hang, but yet the spacing between the outer 'wings' of the combination is wide enough so that the combined system lobe is narrowed. The result at FOH position, which appears to be in the middle, 20 to 30 degrees inward from the inner hangs, and about 60 degees inward from the resultant combined main lobe from both hangs at lower mid/upper bass frequencies, could be as you described. I would expect this effect to be not much more than -6 dB, probably less, since worst case the innermost and outermost lines of 15" drivers would be out of phase, but the middle two lines of 15s would be acoustically close and therefore have wide dispersion. Besides applying some boost at appropriate frequencies, the next step to improve the situation would be to rotate the combined array inward. Further tweaking could be done by modifying the magnitude and/or phase of the innermost and/or outermost drivers in the DSP. Improvements in the center of the venue would probably result in degraded performance at other positions, however. If 'conventional' line arrays were used, either a single hang would not adequately cover the outer edges of what appears to be a wide venue, or dual hangs per side would have variable spacing from top to bottom due to their bananna shape, spreading out the bandwidth of the interference and decreasing it's depth. Whether it would be more pleasant to a listener in the overlap zone between the two is open to testing and debate. [/QUOTE]
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