Lab.gruppen PLM 20K44 - Manual (Page 16)

5. Operation and performance
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PLM+ SERIES Operation Manual rev 1.0.0
5. Operation and performance
This chapter provides comprehensive information on PLM+ Series connection, setup, operation and performance.
The detailed information included here is essential to realizing the full functionality of the PLM+ Series devices.
5.1. Operation precautions
Make sure that the Standby button on the PLM+’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 PLM+ to reduce the risk of any inadvertent bursts of high
level audio.
5.2. Power Output Performance
The PLM+ uses 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.
5.2.1. Symmetrical Power
The PLM+ models can deliver power as shown in Table 5.1 when all channels are driven equally.
Table 5.1: Symmetrical Load Power Ratings
Load Impedance (ohms)
2 ohms
(per channel)
2.67 ohms
(per channel)
4 ohms
(per channel)
8 ohms
(per channel)
16 ohms
(per channel)
PLM 12K44 3000 W 3000 W 3000 W 1900 W 950 W
PLM 20K44 4400 W 5000 W 4400 W 2300 W 1150 W