Lab.gruppen PLM series Operation Manual page 88

12. Application Guide
headroom is not introduced on the input side that is unused or unreasonably high. If full power is not
required, or at least not a high average power, you may also lower the gain on the input of the module.
Figures 12a through 12.2c demonstrate how altering the gain structure within the PLM affects performance.
When using AES (or Dante) inputs:
Figure 12.2a and 12.2b illustrate the recommended configuration of the PLM when using a digital input
source.
Parameter list:
Input clip: 0 dBFS
Amp gain: 35 dB
SNR: 14.2 dB
Absolute Noise Floor = -71.3 dBu
Figure 12.2b illustrates how to achieve the lowest possible output noise; however, this is not a recom-
mended setup
Parameter list:
Input clip: 0 dBFS
Amp gain: 22 dB
SNR: 114.8 dB
Absolute Noise Floor = -71.9 dBu
100,0
50,0
0,0
-50,0
-100,0
-150,0
Analog
-200,0
-250,0
100,0
50,0
0,0
-50,0
-100,0
-150,0
Analog
-200,0
-250,0
88
PLM Series Operation Manual rev 1.1.3
Gain Structure: "High SPL - Low noise - Good headroom"
AES Input Input Mixer Module In Module Out
Figure 12.2a: Gain structure: Digital input source
Gain Structure: "High SPL - Low noise - Good headroom"
AES Input Input Mixer Module In Module Out
Figure 12.2b: Gain structure: Digital input source
Amp Attenuation Analog Ref Amp Gain
Amp Attenuation Analog Ref Amp Gain
Clip
Nominal
Noise
ISVPL Output
Clip
Nominal
Noise
ISVPL Output