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Mirror image line array
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<blockquote data-quote="Tim McCulloch" data-source="post: 97357" data-attributes="member: 67"><p>Re: Mirror image line array</p><p></p><p></p><p></p><p>Are the lines equidistant to the walls of the room or is one hung a little further/closer to the side wall? On axis, do they sound the same auditioned individually?</p><p></p><p>You mention that you're not a measurement guy, but I think you need one to help out. It's very likely not an amplitude/frequency issue but the way one side (or both) are interacting with the room AND each other. Measuring each side on-axis and at a distance ~3x the array length and then comparing the magnitude & phase responses should reveal any polarity issues or non-functional transducers. If the magnitude looks similar and the phase response has the same basic shape, it's time to look at off-axis measurements and see if/how left & right look different *at the mix position*. Again, take the measurement of each hang individually and overlay them on the screen. The side with the most deviation in the phase trace is the one to examine in detail with the impulse response tool. It should be possible to figure out where the reflections are coming from once you know how far away they are (which can be determined by the times of impulse arrival).</p><p></p><p>It is *possible* that the non-mirrored installation contributes to such a problem, but it's likely not the cause of the problem.</p><p></p><p>Another thought - at 40' from the array the mix position is VERY close, and it could be that there is a problem in only 1 box on 1 side. A measurement session should spot something like this very quickly.</p><p></p><p>Here's the deal: if both sides, when measured on axis, individually, have fundamentally similar responses the issue is a matter of what reflections are arriving at FOH and coloring the perception of the direct sound.</p></blockquote><p></p>
[QUOTE="Tim McCulloch, post: 97357, member: 67"] Re: Mirror image line array Are the lines equidistant to the walls of the room or is one hung a little further/closer to the side wall? On axis, do they sound the same auditioned individually? You mention that you're not a measurement guy, but I think you need one to help out. It's very likely not an amplitude/frequency issue but the way one side (or both) are interacting with the room AND each other. Measuring each side on-axis and at a distance ~3x the array length and then comparing the magnitude & phase responses should reveal any polarity issues or non-functional transducers. If the magnitude looks similar and the phase response has the same basic shape, it's time to look at off-axis measurements and see if/how left & right look different *at the mix position*. Again, take the measurement of each hang individually and overlay them on the screen. The side with the most deviation in the phase trace is the one to examine in detail with the impulse response tool. It should be possible to figure out where the reflections are coming from once you know how far away they are (which can be determined by the times of impulse arrival). It is *possible* that the non-mirrored installation contributes to such a problem, but it's likely not the cause of the problem. Another thought - at 40' from the array the mix position is VERY close, and it could be that there is a problem in only 1 box on 1 side. A measurement session should spot something like this very quickly. Here's the deal: if both sides, when measured on axis, individually, have fundamentally similar responses the issue is a matter of what reflections are arriving at FOH and coloring the perception of the direct sound. [/QUOTE]
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