Active low frequency sound field control in a listening room using CABS (Controlled Acoustic Bass System) will also reduce the sound transmitted to neighbour rooms

Sofus Birkedal Nielsen, Adrian Celestinos

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Abstract

Sound in rooms and transmission of sound between rooms gives the biggest problems at low frequencies. Rooms with rectangular boundaries have strong resonance frequencies and will give big spatial variations in sound pressure level (SPL) in the source room, and an increase in SPL of 20 dB at a wall is possible at modal frequencies. For that reason the modal frequencies in the source room will also have big impact on the transmission to neighbour rooms. These low frequency resonance frequencies are very audible in the source room but also in neighbour rooms as a booming bass. CABS (Controlled Acoustic Bass System) is a time based room correction system for reproduced sound using loudspeakers. The system can remove room modes at low frequencies, by active cancelling the reflection from at the rear wall to a normal stereo setup. Measurements in a source room using CABS and in two neighbour rooms have shown a reduction in sound transmission of up to 10 dB at resonance frequencies and a reduction at broadband noise of 3 – 5 dB at frequencies up to 100 Hz. The ideas and understanding of the CABS system will also be given.
Original languageEnglish
Title of host publicationProceedings of Low Frequency 2012
EditorsGeoff Leventhall
Number of pages15
PublisherMultiScience Publishing Co Ltd
Publication date2012
Pages147-161
Publication statusPublished - 2012
EventLow Frequency 2012: 15th Conference on Low Frequency Noise - Stratford upon Avon, United Kingdom
Duration: 22 May 201224 May 2012
Conference number: 15

Conference

ConferenceLow Frequency 2012
Number15
CountryUnited Kingdom
CityStratford upon Avon
Period22/05/201224/05/2012

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