Signal Flow

Overall amplifier gain (input sensitivity) is adjustable in eight steps from +23 dB to +44 dB via three rear-panel-mounted DIP-switches, making it possible to precisely match the amplifier to any input source device. Individual channel gain is adjustable in 3 dB increments from 0 dB to -infinity via four front-panel-mounted level potentiometers. These are located below the indicators, and behind the detachable front panel grille, which effectively serves as a security cover.

The Voltage Peak Limiter (VPL™) is fully user-adjustable, providing the unique option of selecting maximum output peak voltage and thereby the maximum output power. This is convenient when using the amplifier to drive speakers with different power requirements, and when connecting to constant voltage systems requiring 70 V or 100 V at the output. Eight individual output voltage levels are selectable.

The Current Peak Limiter (CPL) protects amplifier and power supply modules, as well as preventing damage to connected loads. Following the VPL and CPL circuits, several other important monitoring and protection features are provided. These include circuits for monitoring and control of voltage, current, and temperature.

FP+ Series amplifiers are a lasting investment. Designed and built in the tradition that has made Lab.gruppen world-famous among tour sound companies, FP+ is an icon for reliable amplification and consistently superior performance over the long term.