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From Mungo Prairie Dog, 7 Months ago, written in Plain Text.
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  1.  A loudspeaker enclosure is a cabinet made to transmit sound to the listener via mounted loud speaker drive units. The significant purpose of this loud speaker enclosure is to avoid the out of phase noise waves of the back of the speaker out of blending with the Inphase sound waves from the front of the speaker. http://www.repairingyourcaruk.co.uk/uncategorized/acoustic-enclosures/ ends in port patterns and cancellation, inducing the efficiency of these speakers to become paid off; particularly from the low frequencies where the wavelengths are so high that disturbance can impact the entire listening area.
  2.  Many loudspeaker enclosures utilize some type of structure, similar to a box to contain the outside of energy. The box has been made of timber or, more recently, vinyl, both for its reasons of ease of structure and appearance. Loud speaker cabinets are sometimes sealed and sometimes ported. Ported cabinets allow some of their sound energy inside the cabinet to be published, and if designed properly with appropriate focus to phase relationships, both increase bass response and reduce driver journey.
  3.  A great many other engineering variations on the basic box design exist, such as acoustic lines. Enclosures always play a substantial role in sound production along with the intended design effects, adding regrettable resonances, diffraction, along with other unwelcome phenomenons.
  4.  Bass-reflex or vented loudspeaker enclosure
  5.  Vented or bass reflex enclosures need special structures due to the large forces which can be developed by the drivers installed inside that behave upon them. Vented loud speaker enclosures have two principal purposes - the separation of vibrations from front and rear of the loudspeakers, and the containment of atmosphere to ensure that the atmosphere can act like a resonating elastic medium inside the enclosure.
  6.  Vented enclosure operation is comparable to how a bottle will probably act as a whistle. At a system that is ventilated it's important to prevent air escapes, because the port produces most of the noise at the frequency of the pressure in the enclosure may be significant.
  7.  Air flows in the walls or tiles of the enclosure can get the tuning of this device to shift in frequency, so producing other undesirable effects also. The material utilized for enclosure walls should be sturdy and compact and should be free of voids or warps. The ideal loudspeaker enclosure would not have any wall space in frequencies that fall within the frequency array of loudspeakers mounted in it. 25 millimeter solid lead plate would make an excellent loudspeaker enclosure.
  8.  Woofer and subwoofer enclosures
  9.  Enclosures employed for woofers and subwoofers can be satisfactorily modelled in the low frequency region, approximately 100 to 200 Hz and below using acoustics and the lumped component model. Electrical filter theory has been used with considerable success for woofer and subwoofer enclosures.
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