Lab.gruppen PLM 20K44 Operation Manual page 50

7. Front Panel Interface
7.11.2.5. Amp Gain
MENU > MODULE > AMP GAIN
By default, all outputs are selected; use the rotary encoder to change the gain of all power outputs or press the
associated output button to deselect one or more outputs.
Amp Gain adjusts the gain of the PLM+'s power output stage for each output channel. The default setting is
35 dB, variable in 0.1 dB increments from 22 dB to 44 dB. Care should be taken in altering Amp Gain, which
should be adjusted in conjunction with the Gain controls and limiter thresholds.
7.11.2.6. Limiters
MENU > MODULE > LIMITERS
Various parameters of the PLM+'s Inter-Sample Voltage Peak Limiter (ISVPL) and the Lake LimiterMax can be
adjusted via this submenu. By default, simultaneous adjustment of most limiter parameters across all output
channels is selected, although channels may be adjusted individually if required. Attack and Release times must be
adjusted individually per module DSP channel.
Inter-Sample Voltage Peak Limiter Threshold (ISVPL Threshold)
The ISVPL prevents the voltage of the PLM+ outputs from exceeding a pre-determined value. The ISVPL Threshold
can be adjusted between 17.8 V to 600 V, which represents the instantaneous peak voltage, not the RMS value of
the output signal. The actual value is displayed in brackets and can be limited by the maximum voltage a particular
PLM+ Series model can produce and/or by the RPM Power allocation algorithm. In the ISVPL menu, the default
voltage is displayed. To see the Amplifier Maximum with RPM, please refer to the technical data sheet. If the voltage
shown is above the default voltage, then RPM is enabled on that channel.
ISVPL Limiter and Voltage Clip feedback to either minimize distortion or maximize SPL as described below.
1. Universal – Inter Sample, Optimized for low distortion, usable for all frequencies
2. Sub/LF – Inter Sample, Optimized for higher SPL below 600 Hz, usable for all frequencies
3. Sub – Optimized for high SPL, 20 - 200 Hz
4. LF – Optimized for high SPL, 20 - 1200 Hz
5. MF – Optimized for high SPL, 300 - 6000 Hz
6. HF – Optimized for high SPL, > 1 kHz
MaxPeak Level (MaxPeakLvl)
This sets the maximum peak signal level at the Module outputs. It is adjustable from -30 dBu to +30 dBu in 0.1 dB
increments, subject to user
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PLM+ SERIES Operation Manual rev 3.0.1