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designing the optimal sound isolation solution. Let’s look at these in turn.
Mass is simply the weight of the sound isolation structure. As the mass doubles, the transmission loss improves by 6dB. It is pretty intuitive that a massive and dense structure will block more sound than a light weight one, but this also implies that the structure will use a considerable available floorspace. It is therefore tempting to use a very dense material such as metal panels however the rigidity of these materials actually makes them a poor choice. The rigid material tends to vibrate more releasing much of the sound energy back into the space.
Air permeability is a critical factor. Just as water will find the tiniest crack and seep through it, so will sound energy. Any gaps in the sound isolation shell will greatly weaken the performance and only real attention to detail can ensure that they are blocked during construction.
Obvious problems come from items such as doors and windows but much more difficult to solve can be hidden flanking paths such as around duct work or cable penetrations. These tiny hidden flanking paths can cost as much as 10dB decrease in transmission loss so play a huge role in the end result.
Isolation is an often overlooked factor in cinema sound isolation. When you look at that giant subwoofer that will create a
SOUND ISOLATION RELATES TO THE CONSTRUCTION OF THE ACOUSTIC SHELL TO MAXIMISE THE ATTENUATION BETWEEN THE CINEMA AND SURROUNDING SPACES. WE CAN TACKLE SOUND ISOLATION BY APPLYING M A I D – MASS, AIR PERMEABILITY, ISOLATION AND DAMPING
20Hz note at 115dB it should come as no surprise that the resulting sound wave has a huge amount of energy in it. When that energy hits the walls, floor and ceiling that energy needs to be converted to some other form – typically motion and heat – for it to be removed inaudibly.
That same energy however can easily be transferred into the structure at which point it can travel much further than when in air. By isolating the speakers so that they do not couple to anything in the space and isolating the walls, floor and ceiling from the structure you can prevent this transfer. It is much easier to contain the sound in air than it is if the sound couples with the structure.
Damping is our final element in the sound isolation framework. Heavy, rigid objects like metal panels, quickly release energy directing the sound both back towards the origin and outwards towards the rest of the vessel. The use of damping materials on these objects greatly reduces that tendency which results in a similar increase
in the transmission loss. An even greater performance can be achieved by layering materials of varying rigidity. Using a so- called limp mass material between two more rigid surfaces makes a tremendous improvement.
With the correct approach it is possible to deliver an isolation performance where any noise leaking from the cinema is reduced to that of the overall background noise of the vessel.
The MAID framework from Cinema Acoustic Treatment Systems can be used to optimise and improve almost any typical construction to deliver the best possible result.
To find out more about how C-ATS can enhance your onboard entertainment environment, please contact Qualtron.
T: +49 4331 43 79 057
E:
superyachts@qualtron.com W:
www.qualtron.com
https://www.c-ats.co.uk/
ONBOARD | SUMMER 2023 | 73
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