Tuesday, June 24, 2014

Acoustic Sound Panels For Churches Eliminate Unwanted Distortion

By Ina Hunt


In some large buildings musical tones fade away in a pleasant echo, while speech is nearly impossible to understand. Even though religious music plays an important role during services, a congregation must also hear the spoken message without having to unnaturally strain. Acoustic sound panels for churches solve this problem by focusing the individual vibrations, making them easier for people to hear and understand.

Some European cathedrals are noted for their lush reverberation, but a very fine line separates a pleasant echo from a noisy, irritating mix of garbled words. Most reverberation is caused by noise bouncing off of hard surfaces such as walls and ceilings. Although there are some buildings that take acoustics into account in their original design, many churches are located in structures that have been re-purposed.

Although they did not have the advantage of modern computer modeling, historical attempts to correct the problem including adding absorbing ash to clay pots located in the walls and corners. This solution is primarily based on trial and error, with material added and subtracted until the desired clarity is achieved. Other methods included altering support pillars to redirect echo, or using specially cut stone blocks.

Today, solutions range from installing carpeting in strategic areas to using high-tech electronic reverberation systems that create a variety of listening environments. Both are effective, but neither can completely solve echo or muffling problems that are actually a product of the original building design. For many structures, a mixture of methods that also emphasizes special flat baffles creates the best results.

Rather than actually eliminating or blocking certain frequencies, they absorb the excess that confuses the ear. Most construction is fairly simple. There is an inner layer of dampening material surrounded by a rigid frame, and the exterior is covered with a variety of decorative materials. Fillings are commonly made of fiberglass, insulating foam, or newer, less environmentally hazardous materials.

Their size depends the extent of the echo and distortion. Some are as small as four square feet, while others may be nearly wall-sized, and most solutions require combinations. No matter their dimensions, they allow vibrations to pass through the exterior material rather than bouncing off, and any waves that return are re-absorbed. This principle is the same one used by music studios to emphasize accuracy, and can be easily adapted to churches.

Rather than being an industrial-looking eyesore, these structures lend themselves to the type of decor perfect for houses of worship. They may mirror stained glass windows, or can be used to repeat various themes already existing on actual walls or ceilings. Unadorned, they may seem intrusive, but in most cases a properly installed group looks like part of the original surroundings.

It is possible to precisely arrange them in the best possible positions using digital analysis, but diffusion and absorption is often best measured by the most effective tool of all, human hearing. Once the best configuration has been discovered, units can be positioned permanently. Instead of preventing certain frequency ranges or cutting down the volume, they make both speech and music sound clean and clear.




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