Operation And Performance - Lab.gruppen PLM 20K44 Operation Manual

5. Operation and performance

5. Operation and performance
5.1. Operation precautions
Make sure that the Standby button on the unit's front panel is either unlit (OFF), or red (STANDBY), before making
any input or output connections. Ensure the AC voltage is within the range printed on the label adjacent to the AC
mains connector. Ensure no input signal is present when powering on the unit to reduce the risk of any inadvertent
bursts of high level audio.
5.2. Power output performance
The PLM20K44 and PLM12K44 use Lab.gruppen's patented Class TD technology (Tracking Class D) in the output stages,
which couples the efficiency of Class D topologies to the sonic purity of Class A/B designs. The primary benefit is that
Lab.gruppen's Class TD works perfectly under all load conditions. The output maintains its flat frequency response
even into complex loads with very low nominal impedances. Reliability is very high, and there is no interference with
nearby RF equipment. Superior efficiency allows greater power density while minimizing cooling requirements, yet
sound quality matches that of the best Class A/B designs. The PLM5K44 uses a newly developed Class D technology
design with increased efficiency and sustained sonic performance.
5.2.1. Symmetrical Power
The PLM+ models can deliver power as shown in Table 5.1 when all channels are driven equally.
Load Impedance (ohms)
PLM 5K44
PLM 12K44
PLM 20K44
Table 5.1: Symmetrical Load Power Ratings
5.2.2. Rational Power Management™
across channels of the PLM+ unit. Power that is not used by one output channel is free for use by another output
channels that can produce the maximum channel power of the largest model. Hence, by using RPM, it is possible
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PLM+ SERIES Operation Manual rev 3.0.1
2 ohms 2.67 ohms 4 ohms
(per channel) (per channel) (per channel)
900 W 1250 W 1250 W
3000 W 3000 W 3000 W
4400 W 5000 W 4400 W
model.
8 ohms 16 ohms
(per channel) (per channel)
1250 W 700 W
1900 W 950 W
2300 W 1150 W