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HyperboLine ™ new Player in the Old Game
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<blockquote data-quote="Bennett Prescott" data-source="post: 107876" data-attributes="member: 4"><p>Re: HyperboLine ™ new Player in the Old Game</p><p></p><p></p><p></p><p>I suspect this is due to different limitations. In the phone network, higher frequencies require more bandwidth. Digital phone switching equipment operates at a sample rate of 8kHz, which means the maximum usable frequency response is 4kHz. There is no practical lower frequency limit except that most telephone receivers have miserable little speakers and can't produce low frequencies very well, 300Hz is "low enough" and practical for micro speakers at moderate SPL.</p><p></p><p>For paging, almost the opposite is true. 5kHz is easy for small cone drivers and large compression drivers, and air loss isn't super bad at that frequency for a very long distance (about 4.5dB down at 100M / 300'). Excursion becomes a serious limitation, however, and many compression drivers even on relatively large horns as far as pro audio is concerned have trouble getting below 4-500Hz. Doing 250Hz with serious power (enough to get paging audio several hundred feet) requires a serious compression driver, or cones, and many paging systems are dirt cheap and don't use Big Boy Drivers.</p></blockquote><p></p>
[QUOTE="Bennett Prescott, post: 107876, member: 4"] Re: HyperboLine ™ new Player in the Old Game I suspect this is due to different limitations. In the phone network, higher frequencies require more bandwidth. Digital phone switching equipment operates at a sample rate of 8kHz, which means the maximum usable frequency response is 4kHz. There is no practical lower frequency limit except that most telephone receivers have miserable little speakers and can't produce low frequencies very well, 300Hz is "low enough" and practical for micro speakers at moderate SPL. For paging, almost the opposite is true. 5kHz is easy for small cone drivers and large compression drivers, and air loss isn't super bad at that frequency for a very long distance (about 4.5dB down at 100M / 300'). Excursion becomes a serious limitation, however, and many compression drivers even on relatively large horns as far as pro audio is concerned have trouble getting below 4-500Hz. Doing 250Hz with serious power (enough to get paging audio several hundred feet) requires a serious compression driver, or cones, and many paging systems are dirt cheap and don't use Big Boy Drivers. [/QUOTE]
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