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Implementing wave field synthesis in an ITU spec listening room part 2: Bass without modes

Hargreaves, J.A. and Wankling, Matthew (2011) Implementing wave field synthesis in an ITU spec listening room part 2: Bass without modes. In: Reproduced Sound RS 2011: Sound Systems Engineering or Art, 16th-18th November 2011, Brighton, UK. (Unpublished)

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Abstract

In recent years various sound reproduction systems have been proposed which attempt to use multiple transducers to tame the modal behaviour often prominent in rooms at low frequencies. Of particular interest is the Controlled Acoustic Bass System (CABS) proposed by Celestinos and Nielsen, and it was decided to install a permanent system in our ITC spec. listening room. A number of constraints had to be considered, not least positioning the subwoofers so as not to compromise the existing passive acoustic treatment. A system comprising eight subwoofers was implemented and rear delay and attenuation were fine tuned to minimise deviation from a flat frequency response over the listening area. The result was a significantly more uniform frequency response and the elimination of the most prominent tonal artefacts. This allowed corrective equalisation to be applied giving the system a nominally flat response over its operating frequency range of 30Hz to 120Hz.

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Item Type: Conference or Workshop Item (Lecture)
Subjects: T Technology > T Technology (General)
Schools: School of Computing and Engineering
School of Computing and Engineering > Music Technology and Production Research Group
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References:

1. ITU-R BS.1116-1, “Methods for the Subjective Assessment of Small Impairments in Audio
Systems Including Multichannel Sound Systems”, International Telecommunications Union,
Geneva, Switzerland (1997)
2. IEC.60268-13, BS.6840-13, “Sound System Equipment – Part 13: Listening Tests on
Loudspeakers”, International Electrotechnical Commission, Geneva, Switzerland (1998)
3. Celestinos, A., & Nielsen, S.B. “Controlled Acoustic Bass System (CABS) A Method to
Achieve Uniform Sound Field Distribution at Low Frequencies in Rectangular Rooms”,
Journal of the Audio Engineering Society 56 (11): 915 – 931 (2008)
4. T. Welti and A. Devantier, “Low-Frequency optimization using multiple subwoofers”,
Journal of the Audio Engineering Society 54 (5): 347 – 364 (2006)
5. J. A. Pedersen, “Sampling the Energy in a 3D Sound Field”, Audio Engineering Society
123rd Convention, New York (2007)
6. Avis, MR, Fazenda, BM and Davies, WJ, “Thresholds of detection for changes to the Qfactor of low frequency modes in listening environments”, Journal of the Audio Engineering
Society, 55 (7/8): 611 – 622 (2007)
7. L. Elmer, B. Fazenda, M. Wankling and J. Hargreaves, “The subjective perception of room
mode control methods”, Institute of Acoustics Reproduced Sound 26, Brighton (2010)

Depositing User: Matthew Stephenson
Date Deposited: 18 Jul 2013 13:01
Last Modified: 02 Dec 2016 05:31
URI: http://eprints.hud.ac.uk/id/eprint/17967

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