able 3 lists the absorption coefficients for each surface, the associated effective absorbing areas in sabins, and the reverberation times (RT) for the acoustically untreated and the acoustically designed home theater with proper spaced absorbent as well as diffusive materials, respectively. In either scenario, the home theater was equipped with a moderate absorbent screen and chairs.
table parameters!
The absorption coefficients of the chair are representing leather chairs which are commonly used in home theaters. the panel absorber is 20 cm deep with damping material placed inside the air cavity. The damping material behind the panel improves absorption down to the low frequencies. The HDTV screen is quite absorbent, especially for higher frequencies and the listeners are introducing a nonnegligible amount of absorption.
The scattering coefficients are assumed to be 10% for an average object in each octave band and are applied to most of the surfaces. The listeners usually have a high degree of diffusing property and are assumed to be 30% at 125 Hz ascending to 80% at 4 kHz.
The scattering coefficients for the diffusers placed at the side walls are estimated by the 2D Lambert diffusion model for a scattering object which is 0.4 m deep.
RT (Untreated) makes clear that it was necessary to bring in an additional absorbing area of around 100 sabins to achieve the approximate target reverberation time of 0.2 seconds.
In this post, we went to second part of the surface treatments and examined its considerations. Items needed to mention audio improvements and other parameters will be published in future posts. These items will pave the way for creating a home theater with the highest quality.
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