Acoustic Resonance Characteristics of Birch Wood Loudspeaker Enclosures: Analysis of Influence of Shape and Filling

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60460709%3A41320%2F25%3A106098" target="_blank" >RIV/60460709:41320/25:106098 - isvavai.cz</a>

Result on the web

<a href="https://www.mdpi.com/1999-4907/16/10/1530" target="_blank" >https://www.mdpi.com/1999-4907/16/10/1530</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/f16101530" target="_blank" >10.3390/f16101530</a>

Result language

angličtina

Original language name

Acoustic Resonance Characteristics of Birch Wood Loudspeaker Enclosures: Analysis of Influence of Shape and Filling

Original language description

This study presents a comparative analysis of a "design" speaker cabinet shape and a conventional block enclosure, both having identical internal volumes. Both enclosures were built from birch wood, and for comparison, block-shaped baffles were also made from medium-density fiberboard (MDF). While the designer's new shape was handcrafted using a lathe, a cube baffle was made using a CNC machine. The block-shaped sound box was made as a representative of the classic shape that occurs most often in the world of music. For this reason, it is offered as an ideal reference sample of the enclosure for comparison with the new design proposal, which was produced based on the shape predispositions and the interest of potential customers. The loudspeaker systems were then subjected to anechoic chamber testing using the exponential sine sweep (ESS) technique to assess and compare their resonance characteristics. The box-shaped enclosure showed a smoother course of the frequency response, but the differences are not significant. A potential improvement in acoustic performance was offered by an acoustic dampening material that was incorporated into each enclosure, and the measurement was repeated. The drop shape from solid birch benefits most from filling, with an 8 dB reduction in low-end boom and 2 dB smoothing, resulting in more controlled bass. The cuboid of solid birch is quite stable even without filling, but filling still improves deep bass by similar to 3 dB and smooths mid-bass by similar to 2 dB. For comparison, the cuboid made of MDF shows the largest improvement with filling, with a 10 dB reduction in sub-bass peaks and 4 dB smoothing in dips. With the acoustic filling, the frequency curves are even more smoothed, and it can be said that the damping material can eliminate some of the imperfections of the enclosures.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

40102 - Forestry

Project

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Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

FORESTS

ISSN

1999-4907

e-ISSN

1999-4907

Volume of the periodical

16

Issue of the periodical within the volume

10

Country of publishing house

CZ - CZECH REPUBLIC

Number of pages

14

Pages from-to

1-14

UT code for WoS article

001603992100001

EID of the result in the Scopus database

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