Introduction -- The Low Frequency Problem -- Sound Absorption for Noise Control and Room-acoustical Design -- Passive Absorbers -- Panel Absorbers -- Helmholtz Resonators -- Interference Silencers -- Absorbers with Active Components -- Micro perforated Absorbers --  Integrated and Integrating Sound Absorbers.

The author gives a comprehensive overview of materials and components for noise control and acoustical comfort. Sound absorbers must meet acoustical and architectural requirements, which fibrous or porous material alone can meet. Basics and applications are demonstrated, with representative examples for spatial acoustics, free-field test facilities and canal linings. Acoustic engineers and construction professionals will find some new basic concepts and tools for developments in order to improve acoustical comfort. Interference absorbers, active resonators and micro-perforated absorbers of different materials and designs complete the list of applications.