User`s manual

Audiomatica Srl MLS - Frequency Response 11/07/2001 18.22.33
CH A dBSPL Unsmoothed 51.2kHz 16K Rectangular File: splwatt.mls
100 1k 10k 20k20 Hz
110.0
dBSPL
180.0
Deg
100.0 108.0
90.0 36.0
80.0 -36.0
70.0 -108.0
60.0 -180.0
CLIO
Figure 10.35
Our last example will cover the merge function. When we measured the system of
Fig.10.17 we stated that the lower frequency limit that had to be considered
reliable was 208Hz. We can easily overcome this limit taking another measurement
with the near-field technique and merge the result with the data of Fig.10.17. Doing
near-field measurement you should readjust the output level so that the maximum
sound pressure does not exceed 110dBSPL as this will prevent Microphone overload
problems. Fig.10.36 shows both the near-field and far-field response. Notice the big
level difference. To merge them it is the far-field measurement which should be the
one in memory. Fig.10.37 shows the Merge Dialog with a transition frequency set to
350Hz.
Audiomatica Srl MLS - Frequency Response 07/07/2001 10.15.18
CH A dBSPL Unsmoothed 51.2kHz 16K Rectangular File: grid.mls
100 1k 10k 20k20 Hz
120.0
dBSPL
180.0
Deg
110.0 108.0
100.0 36.0
90.0 -36.0
80.0 -108.0
70.0 -180.0
CL IO
Figure 10.36 and 10.37
Fig.10.38 shows the merged response. Notice that the near-field measurement
level has been scaled to the far-field one. Two very important functions, CV
function and CI function, are explained in Chapter 13 as they are impedance
tools.
Audiomatica Srl MLS - Frequency Response 07/07/2001 10.15.18
CH A dBSPL Unsmoothed 51.2kHz 16K Rectangular File: rogertot.mls
100 1k 10k 20k20 Hz
110.0
dBSPL
180.0
Deg
100.0 108.0
90.0 36.0
80.0 -36.0
70.0 -108.0
60.0 -180.0
CL IO
Figure 10.38
10 MLS & LOG CHIRP 133