User`s manual

LS3/5A, year 1978. Fig.10.14 shows our result.
Audiomatica Srl MLS - Frequency Response 06/07/2001 18.12.25
CH A dBSPL Unsmoothed 51.2kHz 16K Rectangular File: fig10.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 10.14
What you see is the speaker plus the room where we took our measurement, which
is far from being anechoic. It is time to inspect the time domain. Clicking on the
Time Domain button we get Fig.10.15 and, Fig.10.16, once we zoomed to the first
11ms and expanded the y scale.
Audiomatica Srl MLS - Impulse Response 06/07/2001 18.12.25
CH A dBSPL Unsmoothed 51.2kHz 16K Rectangular File: fig10.mls
0.00 32 64 96 128 160 192 224 256 288 320
ms
0.50
0.40
0.30
0.20
0.100
0.00
-0.10
-0.20
-0.30
-0.40
-0.50
V
CL IO
Audiomatica Srl MLS - Impulse Response 06/07/2001 18.12.25
CH A dBSPL Unsmoothed 51.2kHz 16K Rectangular File: fig10.mls
0.00 1.1 2.3 3.4 4.5 5.7 6.8 7.9 9.1 10 11
ms
0.100
0.080
0.060
0.040
0.020
0.00
-0.020
-0.040
-0.060
-0.080
-0.100
V
C L IO
Figure 10.15 and 10.16
We also did another very important thing. At 7.3ms the first reflection due to the
floor can be seen, just as expected from Fig.10.11. We set the marker at 6.8ms,
which is just before the first reflection, and set the Stop Window there (see Chapter
6.6). By doing this CLIO will set all values of the impulse response received after
6.8ms to 0 before FFT is executed. In this way we simulate a reflection free
environment. Clicking on the Frequency Domain Button we obtain Fig.10.17.
Audiomatica Srl MLS - Frequency Response 07/07/2001 10.15.18
CH A dBSP L Unsmoothed 51.2kHz 16K Rectangular File: grid.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 10.17
124 10 MLS & LOG CHIRP