Two sound-absorbing systems, engineered by Eckel Industries Inc., Acoustic Div., provide a means for reducing background noise and reverberation in engine generator rooms, blower rooms, pump rooms, control stations, operator rooms and other hard reverberant spaces, as well as in offices and administrative areas. These rugged panel systems solve noise control problems in the workplace, offering organizations an easy, cost-effective method of providing personnel with a less fatiguing, safer environment.