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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 ...
The speaker with its characteristic diffraction-absorbing foam surround for tweeter. For its outside broadcasting monitoring, the BBC required a small studio monitor suitable for near-field monitoring of the frequency range from 400 Hz to about 20 kHz. The principal constraints were space and situations where using headphones is unsatisfactory ...
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.
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Thiel Audio first exhibited at the Consumer Electronics Show in 1977 (the year the company was commonly stated as being founded, although they had been selling since 1976) [5] with the introduction of the 01 full-range speaker. A year later, in 1978, the model 03 introduced the principles of time, phase, and frequency coherence, which would ...
Work Completed: Full respray and colour change from blue to Storm Grey, replaced headlights and grille for Turbo R spec units, repainted the new headlight surrounds to match the rest of the car, repainted leather seats to original blue finish, replaced the rubber windscreen seals, polished the brightwork and refitted some new chrome trim around ...
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