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I'm not familiar with ANSI/CEA 2034-A, but an in room response depends not only on the speaker's on- and off axis behaviour, but also on the room dimensions, reflection index, and listening distance relative to the room dimensions.
Studio monitors are often designed for a specific listening distance (or range):
For example the KH-310 has a dispersion angle of about +/- 50 degree, the KH-420 about +/- 40 degree.
- Small nearfield monitors for close listening have a broad dispersion angle so that the mixing engineer sitting at the mixing console can move left or right without leaving the sweet spot. This broad angle means that such a monitor throws more high frequency energy off axis which may result in a less tilted in room response at longer listening distances.
- Bigger monitors designed for longer listening distances have a smaller dispersion angle (due to the longer listening distance a broad angle is not required to stay in the sweet spot) to reduce reflections so that the engineer hears more direct sound (relative to reflected sound) despite sitting farther away. This would also result in a more tilted in room response.
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