Lab.gruppen PLM 20K44 Operation Manual page 17

5. Operation and performance
Desired power can be specified in several domains: burst and peak power; peak and RMS voltage; and also
the speaker's AES power rating. By specifying the nominal impedance of the load, the RPM algorithms have all
input data required to calculate resulting RPM settings. If the desired RPM settings taken together allow total
output higher than the capabilities of the amplifier, RPM will reduce actual RPM configuration evenly based on a
proportional reduction in dB. Once applied, the RPM functionality will ensure that the channel is not delivering more
power than specified. The ISVPL limiter algorithm performs the actual limitation. As default, the smaller models in
the range have an RPM configuration detailing an equal shared power allocation cross the channels at a voltage
(default voltage limitation) given in the specification sheet. To prevent the risk of over allocating the power supply
for varying or incorrect load impedances, RPM has a limitation for the smaller models in the range of the number of
channels that can be lifted above the default voltage limitation. RPM can be configured in two modes.
3000 W
SUB LOW MID HIGH
PLM+ Series - Amp channels power adjusted to match the loudspeaker requirements
Figure 5.2: Amp channels power adjusted to match the loudspeaker requirements
Auto RPM: The frame will automatically allocate power per output channel according to the ISVPL settings in the
speaker preset (per module output) in Lake Controller. Auto RPM assumes a nominal impedance of the Load and
applies an approximate power allocation. Auto RPM is default for PLM+.
Custom RPM: The CAFÉ software allows users to create an advanced custom power allocation scheme.
Switching to Custom mode disables the Automatic mode. Additional information is available in documentation
supplied with the CAFÉ software download.
17
PLM+ SERIES Operation Manual rev 3.0.1