Sound Pressure Level (dB)
Sound Absorption

acoustica

Octave Band Analysis of Noise Level from large distribution transformer before and after fitting Acoustica® ‘Helm Holtz’ Block Absorbers with Inserts

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Acoustica® 'Helm Holtz' Block Absorber Inserts

Combining High Frequency & Low Frequency Absorption

Acoustica® ‘Helm Holtz’ Block Absorber Inserts combine excellent acoustic absorption and sound transmission loss capabilities.

While other walling materials reflect noise , adding to the original noise source, Acoustica® ‘Helm Holtz’ Block Absorber Inserts control both low and high frequency noise, combining acoustic performance with attractive and aesthetic design.

Acoustica® ‘Helm Holtz’ Block Absorber Inserts are used for a wide range of industrial and commercial acoustic applications, including theatres, auditoriums, cinemas, churches, radio and television stations, schools, factories, workshops, plant rooms, indoor sports centres, shopping centres and anywhere where reverberated noise is a problem.

When high frequency noise is to be absorbed, specially designed inserts are placed within the ‘Helm Holtz’ cells (Fig 1), allowing the absorption of sound across a range of frequencies.

Acoustica® ‘Helm Holtz’ Block Absorber Inserts are compatible with Series 150 bond beams and part size blocks.

 

Download Acoustica® ‘Helm Holtz’ Block Absorber Inserts Pamphlet (PDF)

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the quiet Australian

Copyright Acoustica® 2006

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Acoustica® ‘Helm Holtz’ Block Absorber Inserts: 180 x 150 x 50 mm (in blue)

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Centre Frequency Octave Band (Hz)

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Centre Frequency Octave Band (Hz)

Before Acoustica® ‘Helm Holtz’ Block Absorbers with Inserts

After Acoustica® ‘Helm Holtz’ Block Absorbers with Inserts

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Sound Absorption Characteristics of Acoustica® ‘Helm Holtz’ Block Absorbers with inserts

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