At very low frequency, even large anechoic chambers can not be used to measure subwoofers accurately. A solution consists in using the Field Separation Method. This technique allows subtracting the field reflected by the measurement room walls to the measured field, thus recovering the acoustic pressure that would have been radiated under free field conditions. In this work, the Field Separation Method is used to measure two subwoofer prototypes. Results are compared to the ones given by a boundary element modelization of the subwoofers. Input velocities required for the modeling are measured by using a laser Doppler vibrometer. Comparisons are performed on the following quantities: on-axis pressure and directivity. Discrepancies between results obtained by these two methods are discussed and explained when possible.

Authors: Melon, Manuel; Langrenne, Christophe; Thomas, Olivier; Garcia, Alexandre
Affiliation: CNAM, Paris, France
AES Convention: 127 (October 2009) Paper Number: 7845
Publication Date: October 1, 2009 Import into BibTeX
Subject: Transducer Modeling and Design
Permalink: https://www.aes.org/e-lib/browse.cfm?elib=15040

Click to purchase paper as a non-member or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!

This paper costs $33 for non-members and is free for AES members and E-Library subscribers.

Learn more about the AES E-Library

E-Library Location: (CD 127Papers)   /127/7845.pdf

Start a discussion about this paper!