# Spherical speaker enclosure - Calculations for Bass-Reflex enclosure and Internal Helmholtz absorber

Hi,

I'm looking for somebody to calculate the parameters for the design of a spherical speaker enclosure shape to be manufactured in high-tech concrete. We're using a 5" driver : Tang Band W5 2143 (complete specs below and spec sheet available for download).

- Calculate correct internal volume for Bass-reflex operation (Bessel alignment with FB of 45.7 Hz)

- Recommendation for placement and number of Bass-reflex ports to avoid port resonance the most possible.

- Calculate correct dimensions of a Internal Helmholtz absorber to lower the enclosures internal resonance.

- As a plus It might be interesting to to look into modelling the enclosure in COMSOL or other FEA application to be able to reduce resonances even further.

Thiele/Small parameters of W5 2143 driver below :

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Resonant Frequency (Fs)55 Hz

DC Resistance (Re)6.3 ohms

Voice Coil Inductance (Le)0.023 mH

Mechanical Q (Qms)3.21

Electromagnetic Q (Qes)0.43

Total Q (Qts)0.38

Compliance Equivalent Volume (Vas)0.671 ft.³

Mechanical Compliance of Suspension (Cms)1.398 mm/N

BL Product (BL)5.43 Tm

Maximum Linear Excursion (Xmax)2.5 mm

Surface Area of Cone (Sd)97.83 cm²

スキル： 有限要素解析（FEA）, 機械工学, 物理

( 0件のレビュー ) Paris, France

プロジェクトID: #11758566

## 5人のフリーランサーが、このジョブに平均€27/時間で入札しています

BBGroup

Dear Sir/Madam I'm mechanical engineer. I'm expert in mechanical design. And this is some previous prototypes [login to view URL] Also please check some もっと

€15 EUR / 時間
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bchandra1955

Professional acoustic engineer with 39 years of experience can help you ......................................................

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engrtahir1

I have worked on comsol very well. I have also worked on acoustic module and the results were similar to experimental data.

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prashushinde9

Hello, I understood the initial scope of this project. Although i want to discuss further this job in order to prepare the final concept for this project. After Complete discussion over the call or in chat, i wi もっと

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