The room reflections can be excluded from the measurement results by introducing a time-window to the signal processing. A comfortable wizard in the FX-Control PC-software allows localizing the reflections in an impulse-response or energy-time curve (ETC) display. The time-window can then be graphically placed in front of the reflections, thus feeding the measurement algorithm with the direct sound signal only. The influence of the time-window to the frequency response becomes visible in real time.
Frequency Response of a Speaker (measured with reflections from walls and ceiling)
Measured Impulse Response
Manually removing reflections from the walls and ceiling
Resulting actual Frequency Response of the Speaker (without any room reflections)
Learn more about the FX100 Audio Analyzer