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A small amount of airflow must be allowed so that the speaker can adjust to changes in atmospheric pressure. A semi-porous cone surround allows enough air movement for this purpose. Most Acoustic Research designs used a PVA sealer on the foam surrounds to enable a longer component life and enhance performance. The venting was via the cloth ...
A close-up image of acoustic foam. Acoustic foam is an open celled foam used for acoustic treatment. It attenuates airborne sound waves, reducing their amplitude, for the purposes of noise reduction or noise control. [1] The energy is dissipated as heat. [2] Acoustic foam can be made in several different colors, sizes and thickness. [3]
The cone stiffness/damping plus the surround's linearity/damping play a crucial role in accuracy of the reproduced voice coil signal waveform. This is the crux of high-fidelity stereo. The surround may be resin-treated cloth, resin-treated non-wovens, polymeric foams, or thermoplastic elastomers over-molded onto the cone body.
For music surround channel information is intended to be more direct as in a soundstage there would be direct noise from all around and not ambience as in a movie setting. For this reason surround speakers should not be set up to be strictly diffuse. Optimally there should be discrete surround channels for diffuse and direct effects.
Because most surround sound mixes are produced for 5.1 surround (6 channels), larger setups require matrixes or processors to feed the additional speakers. [25] The standard surround setup consists of three front speakers LCR (left, center and right), two surround speakers LS and RS (left and right surround respectively) and a subwoofer for the ...
The Apple Pro Speakers were introduced in January 2001 alongside the Power Mac G4 Digital Audio, based on the G4 Cube's spherical speakers with a new digital audio system, plastic grilles, white rubber/silicone surrounds rather than the black foam used on the G4 cube speakers and changed the connector to a proprietary minijack that provided ...