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 United States
Alabama (NY)
Joined : 05/06/2019 / Visited: 05/06/2019
Posts : 0

May 06, 2019
acoustic design. what to choose?

One of the important factors affecting the sound of the speaker system is the acoustic design. When designing speakers, the manufacturer usually faces a problem in choosing the acoustic design. They are more than a dozen species.

Acoustic design is divided into acoustically unloaded and acoustically loaded. The first involves the design in which the oscillation of the diffuser is limited only by the rigidity of the suspension. In the second case, the diffuser oscillation is limited, in addition to the rigidity of the suspension, by the elasticity of the air and the acoustic resistance to radiation. Also, acoustic design is divided into single and double action systems. The system of single action is characterized by the excitation of sound coming to the listener through only one side of the diffuser (the radiation of the other side is neutralized by acoustic design). The system of double action involves the use in the formation of sound on both surfaces of the diffuser.

Since the acoustic speaker design has almost no effect on the high-frequency and mid-frequency dynamic heads, we will discuss the most common variants of the low-frequency acoustic body design in multimedia.

A very widely used acoustic scheme, called the "closed box". Refers to the loaded acoustic design. It is a closed case with a speaker diffuser on the front panel. Advantages: good AFC performance and impulse response. Disadvantages: low efficiency, the need for a powerful amplifier, a high level of harmonic distortion.

But instead of dealing with sound waves caused by vibrations on the back of the cone, they can be used. The most common variant of the systems of double action is bass reflex. It is a pipe of a certain length and cross section, mounted into the body. The length and cross-section of the phase inverter is calculated in such a way that at a certain frequency a vibration of sound waves is created in it, in phase with oscillations caused by the front side of the diffuser.

For subwoofers widely used acoustic scheme with the common name "box-resonator." Unlike the previous example, the speaker cone is not displayed on the housing panel, but inside, on the partition wall. The speaker itself is not directly involved in the formation of the low-frequency spectrum. Instead, the diffuser only excites low-frequency sound vibrations, which then multiply by volume in the phase inverter tube, playing the role of a resonant chamber. The advantage of these design solutions is high efficiency with small dimensions of the subwoofer. Disadvantages are manifested in the deterioration of phase and impulse characteristics.

The best choice would be medium-sized speakers, if possible with a wooden case, made according to a closed circuit or with a phase inverter. When choosing a subwoofer, one should pay attention not to its volume (according to this parameter, even computer subwoofers usually have an adequate supply), but to reliably reproduce the entire low frequency range. From the point of view of sound quality, the most undesirable are speakers with drilled holes for ventilation, made of thin plastic or of very small dimensions, which are slightly larger than the speaker.