The Solid Foundation:
Lab.gruppen Core Technologies
Reliability, durability, sound quality and pure power remain the fundamentals for any touring amplifier, and in this
regard PLM+ rigorously maintains Lab.gruppen’s industry-leading reputation.

Key Lab.gruppen technologies incorporated in the PLM+ Series platform include:
+ Regulated Switch-Mode Power Supply (R.SMPS)
A fully regulated design that connects to any mains supply

+ Inter-Sample Voltage Peak Limiter (ISVPL™)
Digitally controlled broadcast quality peak limiter with

in the world and ensures stable output power independent
of deviations in the mains voltage

exceptional accuracy for maintaining sonic purity

+ Under-Voltage Limiting (UVL)
Allows continued operation despite severe voltage drops
+ Best-in-class Power Factor Correction (PFC)
Unique Current Draw Modelling (CDM™) reduces peak

+ Intercooler® Cooling System
Equipped with the extraordinarily efficient copper-finned
Intercooler system, PLM+ amplifiers expel heat more
efficiently, eliminating ‘end of tunnel’ output device over temperature problems

current draw from the mains supply; inherent rail regulation
maintains stable rail voltages during extended bursts

+ Breaker Emulation Limiter (BEL)
Prevents mains fuse tripping

+ Patented Class TD® Output Stage
Combines the efficiency of Class D with the sonic

+ Full Suite of Protection Features
Thermal ‘show-must-go-on’ Limiting, Very High Frequency

qualities of Class B topologies.



Protection (VHF), Direct Current Protection (DC), Short Circuit
Protection, Current Clip Limiter, Voltage Clip Limiter

Regulated Switch-Mode Power
Supply (R.SMPS)