Lab.gruppen PLM series Operation Manual page 90

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
60.0
40.0
20.0
0.0
-20.0
-40.0
-60.0
-80.0
-100.0
-120.0
-140.0
Analog
90
PLM Series Operation Manual rev 1.1.3
Gain Structure: "High SPL" Application (Moderate noise with very high output)
AES Input Input Mixer Module In Module Out Amp Attenuation Analog Ref
Figure 12.2c
Amp Gain ISVPL Output
Clip
Nominal
Noise