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For a speaker with multiple drive units you would typically measure at 1m distance to see the overall response, at a height that corresponds to the typical listening height. If you measure very close to a drive unit, such as the 6" from the tweeter you mentioned, the contributions of the other drivers will be from very strongly off-axis and not be representative. Close measurements are fine if you want to look at the individual contribution of a single driver through its operating range, but otherwise you need more distance. Room effects can be reduced by gating the measurement to exclude much of the reflections, understanding the limitation that places on the LF limit of the measurement.
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