49
DSX
General Considerations for taking Measurements.
It is very important to take the measurements of the speakers correctly, so subsequent results are
reliable and valid. The following list can be a useful guide to obtain good measurement data files.
1 - Take measurements of all the ways at the same distance (several meters) and with the microphone
placed at the level that we consider as a central point of listening. Thus the magnitude and phase
information of all measurements will be the same.
2 - The measurement equipment must be configured equally in all measures, i.e: input or output signal
gains, sensitivity, sampling rate, and so on should not vary from one measure to another.
3 - It is recommended to take measurementss with smoothing (between 1/3 and 1/6 octave) in order to
have graphics with less valleys and peaks.. Also, remember that the functioning of the Human ear is
similar to an analyzer between 1/3 and 1/5 octave or so.
4 - Try to take measurements in the same conditions that the equipment will have at work time. Like
same amplifiers, gain levels and cabinets. Keep those settings knowing that any change will affect the
performance.
5 - In the case of measuring with
MLS
(maximum length Sequence) and windowed the response time to
avoid reflections on the measurement, take the same time window on all measurements, and eventually
with the initial time common to all. In this case, we will have the same phase information in all measurements
and the final electroacoustical sum will be correct.
6 - The measurements in mid-and high frequencies are almost always correct in the case of measuring
with MLS avoiding reflections on the extent to windowing over time. But for low and mid-low frequencies,
the inevitable problems of reflections and standing waves may distort the measurement in both magnitude
and phase. In such cases we must always interpret the action, because if we want reliable measurements
they should take place at anechoic chamber or in free field. These problems are most critical in closed
rooms than outdoors.
7 - Store all files exported in
ASCII
in the same directory with clear and significant names in order to
remember clearly what the measurement was.
8 - In case of using the
DSX amplifier
as a final equalizer, it is possible to measure the entire system
and equalize on it in the PEQs section in order to correct the overall response.
4 - EDITING WITH DSX
Summary of Contents for DSX-1004
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