In everyday practice room acoustics and the location of loudspeakers very often present problems. To help alleviate these difficulties we have developed an analog signal processor module which offers channel-separate tone control and loudness functions combined with three parametric equalizers. The latter can effectively damp narrow-band room resonance effects in the range 20 Hz to 500 Hz. In this way it is possible to obtain optimum sound quality even in problematic spaces. Naturally, the unit contains relays which can be used to by-pass the functions completely. This module is installed as standard in the P 3000 HV, and can be fitted to the PA 3000 HV and PA 3100 HV integrated amplifiers as an option.