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The Speaker Data Icon in the window Output Equalization will allow you to import ASCII files
containing the measurement data of the transducer/system connected to each output:
Care should be taken to adjust the Reference Level to 0 dB correctly. Here, the average dB value that
you consider you have in the data files should be entered. Normally, this value will be set according to
the mid-range way in the case of multi-way equipment or to the value of the mid-frequencies in full-
range measurements. This value will subsequently be subtracted from all the measurements to centre
the response at around 0 dB on the screen. For instance, if you note that the mid-range average is
around 96 dBspl, you will enter this value as reference. This value can be modified by re-calling the
Import Speaker Frequency Response window and updating the reference value until you see a
response curve which is approximately centred around 0 dB.
Data-files exported in ASCII vary from one system to another one. Here is the process and file format
accepted in each case:
CLIO :
Make an MLS (Maximum Length Sequence) or sinusoidal measurement preferably using a sampling
frequency of 51200 and a smoothing of 1/6 Octave for MLS and at least 1/24 Octave resolution for
sinusoidal. Once the measurement is completed, export it in ASCII format by pressing Shift+F2: this
will generate a file with a name of your choice and the extension .txt which the LMS244 is capable of
reading.
The accepted file format is the following:
Freq
dB
20.0
82.8
20.3
82.9
20.5
82.9
20.8
83.0
21.1
83.0
21.3
82.9
21.6
82.8
...
...
Phase
162.24
161.44
160.54
159.54
158.45
157.28
156.04
...
RAM Audio LMS244 Digital Controller
14
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