Friday, June 13, 2014

How Acoustic Sound Panels For Churches Work

By Ina Hunt


Music and speech are both improved by a small amount of reverberation, but at higher levels it can make both seem annoying and garbled. The choir and sermon are an integral part of many services, but become meaningless when the congregation is unable to hear singing or distinguish words normally. Acoustic sound panels for churches focus amplified waves and natural vibrations, making them more meaningful and pleasant to listeners.

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.

Even without the benefit of modern computer analysis, there have been several methods historically used to correct the problem. Some included the addition of ash to clay pots located at strategic points withing a room. They were moved about, and burnt material was added or removed to dampen specific reverberations. Support pillars that dominated some buildings were specifically altered, and stone blocks specially sized to inhibit echo.

Current solutions range from high-tech reverberation systems that are able to create interchangeable custom acoustic environments, to simply installing thick carpeting in specific areas. These are not ineffective, but neither solves problems of muffling or echo that are a result of the original and unalterable interior building design. For many rooms, the best solution incorporates flat, standing or attached wall panels that inhibit waves.

Rather than cutting out certain frequencies, these baffles absorb unwanted reflections, often within a particular room. They all incorporate a common design approach, using a frame that houses a filling of absorbent material, covered by a variety of decorative possibilities. The interior is most often filled with fiberglass or foam, and there are less environmentally toxic fillers also available.

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.

Far from appearing to be an industrial or high-tech intrusion, these structures easily blend with most modern church decors. They can mirror the patterns and colors of existing stained glass, or can tie a room together by adopting patterns or colors on existing walls and ceilings. While a plain baffle is not particularly attractive, in many cases they end up looking like a part of the intended interior design.

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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