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<blockquote data-quote="drew gandy" data-source="post: 39369" data-attributes="member: 880">Re: Virtual SMAART training: Tell the crossover frequency and typeThe bluish trace is pretty flat in phase between 400 and 1000hz and again from 4000 and up.&nbsp; This tells me that these 2 regions are basically &quot;in time&quot;.&nbsp; If there was a time offset between them then we would see a flat phase in one region with one delay setting of the analyzer but we would need to adjust the delay to see the other region as a flat line.&nbsp; There is indeed about 90 degrees difference in phase, which might tell us something else, but I think those 2 ranges to be pretty close in &quot;time&quot;.&nbsp; If the box was designed for time coherency directly on axis then we are probably looking at a mostly on-axis measurement.&nbsp; Or maybe Phil just found the angle where the timing worked out but the crossover suffered. The brown/green trace has an anomaly around 600 which might be disregardable as an artifact of the measurement environment (indoor or outdoor?) but the overall magnitude and phase is quite comparable to the other side. I&#039;m not very familiar with Smaart.&nbsp; The phase traces look a bit too &quot;singular&quot; to me.&nbsp; If one is a Smaart guru, do you tend to get a feel for when the very clear looking phase trace is accurate and when it isn&#039;t?&nbsp; Or, is the trace always accurate?&nbsp; -drew</blockquote>

[QUOTE="drew gandy, post: 39369, member: 880"] Re: Virtual SMAART training: Tell the crossover frequency and type The bluish trace is pretty flat in phase between 400 and 1000hz and again from 4000 and up. This tells me that these 2 regions are basically "in time". If there was a time offset between them then we would see a flat phase in one region with one delay setting of the analyzer but we would need to adjust the delay to see the other region as a flat line. There is indeed about 90 degrees difference in phase, which might tell us something else, but I think those 2 ranges to be pretty close in "time". If the box was designed for time coherency directly on axis then we are probably looking at a mostly on-axis measurement. Or maybe Phil just found the angle where the timing worked out but the crossover suffered. The brown/green trace has an anomaly around 600 which might be disregardable as an artifact of the measurement environment (indoor or outdoor?) but the overall magnitude and phase is quite comparable to the other side. I'm not very familiar with Smaart. The phase traces look a bit too "singular" to me. If one is a Smaart guru, do you tend to get a feel for when the very clear looking phase trace is accurate and when it isn't? Or, is the trace always accurate? -drew [/QUOTE]

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