Lab.gruppen PLM 20K44 Operation Manual page 79

Figure 10.5 illustrates how to minimize absolute noise while achieving full power. In this illustration it can be seen
that there is no available headroom.
• Input Clip: 12 dBu
• Amp Gain: 30.9 dB
• SNR: 111.3 dB
• Absolute Noise Floor: -68.4 dBu
80,0
60,0
40,0
20,0
0,0
-20,0
-40,0
-60,0
-80,0
-100,0
-120,0
-140,0
Analog AES Input Input Mixer
Table 10.5: Analog: Low Noise with Full Output Power (Low Input / High SPL)
Figure 10.6 illustrates how moderate noise with extreme SPL can be achieved. SPL is extremely high in this
example as maximum headroom is available at the input and within the processing stage. This makes it possible to
increase the average SPL by utilizing internal compression capabilities.
• 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 AES Input Input Mixer
Table 10.6: Analog Input: Moderate Noise with Very High Output (Very High SPL)
Module In Module Out Amp Attenuation
Module In Module Out Amp Attenuation
Analog Ref Amp Gain ISVPL Output
Analog Ref Amp Gain ISVPL Output
PLM+ SERIES Operation Manual rev 1.0.0
10. Application Guide
Clip
Nominal
Noise
Clip
Nominal
Noise
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