Investigation into the effects of the geometry in cone driven midrange horns & phase plugs

Macdonald, L; Hargreaves, JA

Abstract

Midrange horn loudspeakers are usually used in professional audio applications to improve efficiency and control directivity. Because traditional lumped parameter circuits do not model phase plugs or complexities of horn geometry after the expansion, the design of these horns is a complicated problem.
In this project, Finite Element Analysis (FEA) Simulations were used to investigate the effects of the geometry of the phase plug and the compression cavity in front of the driver. It was found that the shape and size of the compression cavity has significant effect on the high frequency cut-off point of the system due to modal behaviour in the cavity. It was also found that if the horns expansion rate is maintained, the shape of the phase plug (and therefore horn wall) after the compression cavity can be used to control the directivity slightly, but only around the high frequency limit of the system.

• Presentation Conference Type: Conference Paper (published)
• Conference Name: Reproduced Sounds 2020
• End Date: Nov 19, 2020
• Acceptance Date: Oct 23, 2020
• Publication Date: Nov 17, 2020
• Deposit Date: Mar 4, 2021
• Publicly Available Date: Mar 4, 2021
• Journal: Reproduced Sound 2020 Proceedings
• Print ISSN: 0309-8117
• Publisher: Institute of Acoustics
• Volume: 42
• Issue: 3
• Book Title: Reproduced Sound 2020 Proceedings
• ISBN: 9781906913380
• DOI: https://doi.org/10.25144/13367
• Publisher URL: https://doi.org/10.25144/13367
• Related Public URLs: https://doi.org/10.25144/13366
• Additional Information: Event Type : Conference