Lab.gruppen PLM 20000Q - Manual (Page 34)

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Quick Start Tutorial
PLM Series Quick Start and Field Reference Guide Rev 1.3.5
6.5.5 Attenuator
An attenuator gain adjustment is provided for each power output channel in the PLM (-inf to 0 dB. This
control replaces the traditional volume control found on conventional amplifiers and should typically be left at
0 dB during use.
6.5.6 Amp Gain
The Amp Gain corresponds to the gain adjustment in a conventional separate loudspeaker processor and
amplifier system. When using a pre-defined Module loudspeaker preset file, the Amp Gain settings will
normally remain as defined in the file. The limiter and output gain settings of the Module were configured
with this gain setting and will not be automatically compensated if changes are made.
6.6 Gain / Level Optimization
6.6.1 Maximize Volume Capability
To maximize the volume capability of the device, ensure there is sufficient headroom in the signal path to
avoid clipping before the limiters engage. It must be possible to achieve enough gain through the device to
engage the limiters and realize a high average SPL. As an optimal setting, allow for a headroom of 10 dB or
more for all channels; the simplest way to accomplish this is to increase the Module input gain.
6.6.2 Minimize Noise
To help provide the best volume to noise ratio, use an AES or Dante digital input signal wherever possible. If
using analog inputs, ensure that unused or unnecessarily high headroom is not introduced at the input to the
device. If full or high average power is not required, the Module input gain may be reduced.