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Application guide 89 – Lab.gruppen PLM 20000Q User Manual

Page 95

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Application Guide

89

PLM Series Operation Manual rev 1.2.3

Input Clip: 0 dBFS

Amp Gain: 35 dB

SNR: 114.2 dB

Absolute Noise Floor: -71.3 dBu

-250,0

-200,0

-150,0

-100,0

-50,0

0,0

50,0

100,0

Analog

AES Input

Input Mixer

Module In

Module Out

Amp

Attenuation

Analog Ref

Amp Gain

ISVPL

Output

dB

/d

B

u

Clip
Nominal
Noise

Figure 10-2: Digital Input: Low Noise with Good Headroom (High Input / High SPL)

Figure 10-3 illustrates how to achieve the lowest possible output noise, although this is not a recommended
configuration.

Input Clip: 0 dBFS

Amp Gain: 22 dB

SNR: 114.8 dB

Absolute Noise Floor: -71.9 dBu

-250,0

-200,0

-150,0

-100,0

-50,0

0,0

50,0

100,0

Analog

AES Input

Input Mixer

Module In

Module Out

Amp

Attenuation

Analog Ref

Amp Gain

ISVPL

Output

dB

/d

B

u

Clip
Nominal
Noise

Figure 10-3: Digital Input Optimized for Minimum Noise - Not Recommended

The improvement in noise performance (at the cost of losing headroom and compression features) is only
0.6 dB; it is therefore not recommended to optimize performance in this manner.

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