Rupert Neve Designs 543 Mono Compressor-Limiter - 500 SeriesThe Portico 543 Mono Compressor delivers the unobtrusive, musical sounding dynamic control and brick wall limiting made famous in the Portico 5043 to the 500 series format. The 543 features a fully controllable compressor limiter with feed forward feedback modes, Peak RMS detection and a built in side chain high pass filter. With an unrivaled heritage and a tremendous feature set, the 543 yields a combination of rich warmth, flexibility and precision