90
PLM Series Operation Manual rev 1.1.3
12. Application Guide
When using analog inputs (continued):
Figure 12.2c illustrates how moderate noise with extreme SPL can be achieved.
The reason why the SPL will be extremely high here is that so much headroom is available at the input and
withiin the processing stage. This makes it possible to increase the average SPL by utilizing the internal
compression possibilities.
Parameter list
Input clip: 0 dBFS
Amp gain: 35 dB
SNR: 114.2 dB
Absolute Noise Floor = -71.3 dBu
Gain Structure: "High SPL" Application (Moderate noise with very high output)
-140.0
-120.0
-100.0
-80.0
-60.0
-40.0
-20.0
0.0
20.0
40.0
60.0
Analog
AES Input
Input Mixer
Module In
Module Out
Amp
Attenuation
Analog Ref
Amp Gain
ISVPL
Output
dB
/d
Bu
Clip
Nominal
Noise
Figure 12.2c
