The low frequency behavior of acoustically small rooms (below 40 m2) is determined by room resonances (eigenmodes, standing waves) causing cancellations and booming. Bass traps – tuned or broadband – provide focused absorption and are effectively used for correction in control rooms, home theatres and HiFi rooms. If not enough traps can be used – due to insufficient space or budget – room correction filters are used for optimizing the frequency response at the listening position. Digital systems provide a huge amount of filter banks but ADDA Conversion between monitor control system or mixing desk and power amplifier is mandatory. That’s why we developed the Cosinus for ambitious users who don’t want any interference at this crucial point of the signal path.