The PB-400 and PB-800 Industry amplifiers are ultra-reliable, high-power, 4 and 8-channel audio power amplifiers designed for use in critical systems. They are designed to drive 100 V line loudspeaker systems and are equipped with on-board DSP allowing gain, EQ, delay and other parameters to be controlled from a remote location using WinControl software, via RS-485, CobraNet® or DANTE™. The amplifiers are fully monitored, with automatic fault detection and reporting. Inputs may be either analogue audio (balanced audio) or digital audio via CobraNet® or DANTE™. When used in conjunction with Duran Audio’s OpSTImizer® service the PB amplifiers can provide significant improvements in speech intelligibility within a tunnel.