The purpose of Acoustic Doors is to provide sound insulation to protect your employees, visitors and other general members of the public from potential noise pollution.
Acoustic doors and soundproof doors are used in a variety of organisations, including commercial, industrial and public companies. These include:
Acoustic doors can be purchased to suit a range of door types and sizes, depending on the needs of your construction project. For example, your acoustic doors can be designed as:
All door types can be manufactured and installed with the required accessories and hardware, including frames, hinges, acoustic seals, handles and closing/locking mechanisms, as well as additional needs like peep holes or viewing windows.
To easily understand how soundproof doors work, it’s best to first examine how the transmission of sound itself works.
Sound is a vibration that spreads as an audible mechanical wave through a medium such as water or air. Sound waves vibrate at different frequencies and are measures in cycles per second – or ‘hertz’.
Humans can hear sound waves with frequencies between about 20 Hz and 20 kHz – sound that is above 20 kHz is ultrasound and below 20 Hz is infrasound.
The “loudness” of sound is by no means an absolute term, there are many other factors which impact how loud we perceive a sound. However, volume is a measure of the vibrations in the medium through which the sound is travelling (air, usually). The stronger the vibrations, the higher the volume. A soundproof door works by simply reducing the sound which can pass through it. How this is achieved though, isn’t quite so simple.
Any kind of door works as a sound barrier in some respect. However, sound waves will still manage to make their way past a standard door unless further preventative measures are taken. These measures include sound insulation and sound absorption.
Sound insulation refers to the process of putting up an acoustic barrier. The greater the mass of the insulation material per unit area of a door, the more soundproof it will be. This is why materials like concrete are such great insulation. However, concrete isn’t very practical for use in acoustic doors. Rather, a double-leaf partition – two sections separated by an air gap filled with a sound absorber – is far more feasible.
Another problem with a material like concrete is its reflective qualities. This is where sound absorption comes into play. Sound absorption describes the ability of materials to restrict the reflection of sound. The higher the absorption, the less reflection.
If you decide to go ahead with an acoustic door set for your building or venue, there are several things you will need to determine. These will help you decide what type of door to select. As a general guide, you should consider: