Operation And Performance; Introduction To Operation; Operation Precautions; Power Output Performance - Lab.gruppen PLM series Operation Manual

7. Operation and Performance

7.1 Introduction to Operation

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.

7.1.1 Operation precautions

Make sure that the Standby button on the PLM's front panel is either unlit, or is showing red (i.e., the PLM
is in STANDBY mode), before making any input or output connections.
Make sure that the AC voltage is correct and matches that printed on the label adjacent to the AC
mains connector.
Make sure that no signal is present at the input to the PLM when powering it up to prevent any inadvertent
bursts of high level audio.

7.2 Power Output Performance

The PLM uses Lab.gruppen's patented Class TD technology in the output stages, which couples the ef-
ficiency of Class D topologies to the sonic purity of Class 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 B
designs.

7.2.1 Symmetrical Power

The PLM models can deliver power as per table 7.2.1 when all channels are driven equally.
Load
Impedance 2.0 2.7
(ohms)
Max.
Output
2350 2700
power
(Watts)
Table 7.2.1a: Symmetrical load power ratings
for PLM 10000Q

7.2.2 Asymmetrical power

The PLM models can deliver power as per table 7.2.2 when every other channel is driven 3 dB lower than
the other.
4 8 16
2300 1200 660
7. Operation and Performance
Load
Impedance 2.0 2.7
(ohms)
Max.
Output
7000 6000
power
(Watts)
Table 7.2.1b: Symmetrical load power ratings
for PLM 14000
PLM Series Operation Manual rev 1.1.3
4 8 16
4300 2300 1150
25