![]() ROUND ONE, concentrated on a range of 86mm ports operating at 30hz only, and measured how usable velocity increases with flare size. Load to the system, resulting in de-tuning and subsequent loss of output, known as compression.Ī series of experiments were done to quantify this behaviour. By this stage the port is beginning to present a different Problem, which represents the limiting velocity for the port. Increasing velocity even further, the air in the "core" of the port becomes turbulent. This method targets the air in the "boundary layer", which is close to the walls of the port. ![]() ![]() Ports operating below about 10 m/sec generally have no problems with turbulence and compression.Īs velocity is increased beyond this, turbulence occurs as air exiting the port is forced to slow too quickly as itįlared ports cause the airflow to expand and loose speed in a controlled fashion, allowing higher speeds without turbulence. Since increasing the area of a port quickly produces very long ports, the most effective means of moving more air is Subwoofer ports have to flow a lot more air than their conventional speaker counterparts.
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