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In early 2015, most or all of Polk's non-technical jobs were moved from the Baltimore office to the headquarters of the parent company, Sound United, in Carlsbad, California. At that time, Polk's engineers joined with those of Definitive Technology, and the Audio and Acoustics Research and Development [ARAD] center was established in Owings Mills.
This list of car audio manufacturers and brands comprises brand labels and manufacturers of both original equipment manufacturer (OEM) and after-market products generally related to in-car entertainment that already have articles within Wikipedia. While components sold by these companies have much in common with other audio applications or may ...
Active noise cancelling (ANC) is a software process that uses existing in-vehicle infotainment hardware to eliminate undesirable noise within the interior of a vehicle. This elimination technique is known as harmonic order reduction, where unwanted audio signals are identified by sensors and filtered out of the overall interior vehicle sound. [3]
A rotary woofer is designed to produce only frequencies lower than 20 Hz; distortion increases as the input frequency exceeds the fan's rotation rate (20 Hz would be about 1200 rpm for the fan). Fan RPM is limited to reduce the constant noise generated by the fan blades. Current models typically spin at around 800 RPM (13 Hz).
In typical installations, subwoofers are physically separated from the rest of the speaker cabinets. Because of propagation delay and positioning, their output may be out of phase with the rest of the sound. Consequently, a subwoofer's power amp often has a phase-delay adjustment which may be used improve performance of the system as a whole.
The rear panel of a Polk subwoofer cabinet, showing a low-pass filter adjustment knob. Equalization can be used to adjust the in-room response of a subwoofer system. [58] Designers of active subwoofers sometimes include a degree of corrective equalization to compensate for known performance issues (e.g. a steeper than desired low end roll-off ...
Different types of noise are generated by different devices and different processes. Thermal noise is unavoidable at non-zero temperature (see fluctuation-dissipation theorem), while other types depend mostly on device type (such as shot noise, [1] [3] which needs a steep potential barrier) or manufacturing quality and semiconductor defects, such as conductance fluctuations, including 1/f noise.
where is the sound frequency in hertz (Hz), is the speed of sound in air at 20°C in meters/second, and is the length of the transmission line in meters. The complex loading of the bass drive unit demands specific Thiele-Small driver parameters to realise the full benefits of a TL design. However, most drive units in the marketplace are ...