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go149
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"杰士（KLIPSCH）作为号角之父，美国70%影院用箱"
这种吹嘘把 Altec Lansing 和 JBL 置于何地呢？
http://filmsound.org/articles/amps/loudspeakers.htm
1950Klangfilm manufactured new equipment for recording on 35mm magnetic film, but studios and manufacturers in Europe and America were slow to embrace this new technology. The high frequency response was greatly improved in relation to photographic sound, and the Academy Curve had to be adjusted accordingly. This caused a demand for better loudspeakers, and a relatively new firm called Altec Lansing developed a directional HF horn called the 'Mantoray' It was designed to aim high frequencies where they were wanted without spill-over into other areas, which was important for the new stereo sound systems making their appearance. Western Electric produced what they called an Acoustic Lens for their HF horn consisting of a series of perforated discs, equally spaced in front of the diaphragm, and a series of slanting vanes. These ensured a vertical distribution into the balcony as well as the stalls. (How many cinemas have balconies today?) Other improvements included plastic diaphragms and suspensions which gave a reduction in failure compared with the aluminium alloy diaphragms previously used, and aluminium voice coils appeared in tweeters.
Altec also produced a new bass enclosure driven by two or more units which were coupled at the back. An air enclosure was ported at the front which extended the bass frequency. However, most cinemas tended to hang on to their existing equipment for as long as they could. |
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用Deepseek满血版问问看
