The professorship of Mechatronics at the Helmut-Schmidt University and University of the German Federal Armed Forces in Hamburg has chosen 16 Adamson Systems B-118 subwoofers for a new sound reinforcement system used as the primary sound projection source with an aircraft passenger cabin model.
This experimental loudspeaker rig will be used for studying the effects of noise emissions of the controversial propfan engines inside of the cabin, and the effectiveness of active noise cancelling measures.
The B-118 subwoofers are utilized to re-create a specific acoustic signature of the engine at realistic sound pressure levels.
The department, headed by Univ.-Prof. Dr.-Ing. Delf Sachau, is internationally respected as a leading research institute for cabin acoustics and active noise cancellation technologies and has multiple partnerships with global players in the commercial aerospace industry.
The new system was installed by Adamson Europe’s Jochen Sommer, in cooperation with Dr.-Ing. Oliver Pabst and Dipl.-Ing. Kai Simanowski.
The B-118 subs were chosen to meet the project’s needs for compact, powerful low-frequency loudspeakers with a frequency range of 40 to 400 Hz, along with extended high-pass characteristics.
Further, the subs needed to be cost effective, as a greater number of units was needed in order to achieve increased flexibility in respect to pattern control through physical placement of each cabinet, and individual processing.
The subwoofers are driven by two Lab.gruppen C48:4 amplifiers and controlled by a single Xilica XA-2040 processor.
The B-118 employs a single AW18 driver, which has an 18-inch woven Kevlar diaphragm driver. With its extremely high stiffness to mass ratio, Kevlar helps eliminate the effects of cone fatigue while providing enhanced long term reliability.
The AW18 continues to be used in a variety of Adamson loudspeakers, including as the LF extension in the Y18 cabinet, as well as in the SpekTrix Sub enclosure.
“The Adamson speakers met our specifications and demands in terms of output, reliability, and acoustic focusing. Further positive effects of the controlled low frequency radiation are greater energy efficiency, and reduced spill towards neighboring test rigs. Flexibility and control of this system offers new possibilities for our acoustic research projects,” states Dipl.-Ing. Kai Simanoswki.