Plaster with Absorptive Characteristics - August 28th, 2008

We are all familiar with a high reverberant space, such as cathedrals. We often go to restaurants that due to the large space and also the reflective surfaces all around, make speech communication virtually impossible. A similar problem occurs in a home cinema installation due to the reflective areas. That would more likely mean poor dialogue intelligibility, and a cinema room which is not as pleasant to use. The home cinema should offer reflection control treatments, to ensure a neutral sounding environment.

Some acoustic absorptive surfaces would solve the problem easily, but the finished look would more likely not satisfy the interior designer’s requirements. The interior designers would prefer the acoustic treatment in certain home cinema rooms to be hidden, and not have a visual impact to the final result.

There is a solution however. BASWA offers a plaster that can be applied over mineral wool. The plaster has a smooth finish, similar to hand-troweled plaster. The top layer’s structure has open pores, so it allows the sound energy to reach the mineral wool underneath.  It is not gypsum based plaster, although it might look like it is. It is a water based emulsion of marble particles, which stays micro-porous after the installation.

There is an unlimited colour choice, which makes it a very unique solution for creating a discrete home cinema room, with excellent acoustic properties, but no visual impact.

Filed under: Technical Articles — admin @ 5:44 pm

Low Frequency Control in a Home Cinema - August 28th, 2008

Small spaces like a home cinema room, often has a poor low frequency response, emphasised at certain frequencies. These frequencies are determined from the dimensions of the room. In an acoustically demanding home cinema room, we need to address these issues from the early stages of design.

Any porous absorption like fibreglass wouldn’t really help at these modal frequencies in the cinema room. Particle velocity of these low frequencies is zero next to the boundaries. That would mean a home cinema design with really deep porous absorbers; that approach would take too much space from the room.

We include custom resonant absorbers in every dedicated home cinema room we design. It is a custom way of managing modal frequencies, and it can be a very accurate too. These resonant absorbers are based on the principle of a mass vibrating against a spring with damping.

The properly designed and engineered home cinema room will offer a much smoother frequency response, and in other words, a very pleasant experience.

Filed under: Technical Articles — admin @ 5:43 pm

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