One-way sound insulation

Functional demands, sound insulation
Installations in the void between the structural soffit and the suspended ceiling, such as piping and ductwork systems, can give rise to noise. In such cases, a sound insulating suspended ceiling system can be used to reduce the noise to acceptable levels in the room below.
Laboratory value Rw
In order to determine the noise level generated by a source in the void, you should ascertain the frequency spectra of the suspended ceiling's sound insulation and the noise source.

Acoustics glossary

Simple explanations of common vocabulary in the world of acoustics

Ecophon Acoustic Bulletin

A news source for Ecophon partners in room acoustics