Good luck with that. Hoffman’s Iron Law (that’s Josef Hoffman, the “H” in pioneering American hi-fi firm KLH) tells us, essentially, that amongst the three desirables of deep bass, lifelike loudness, and compact enclosure size, you can have any two but never all three from a single design.
It’s not really Joe’s law, of course, but the universe’s. High acoustical levels of truly low frequencies need a large vibrating surface moving a good distance in and out: it’s a function of wavelength, which increases rapidly as frequency decreases. And a big woofer needs a large box to baffle it properly and supply an adequate volume of air to achieve sufficiently low resonance—and, of course, to fit that big driver.
Beating these restrictions requires considerable electroacoustic guile, which is precisely what KEF—one of Britain’s oldest loudspeaker makers—has brought to bear on a new design it terms Uni-Core. Briefly, this is a clever, “force-cancelling” (back-to-back) double-woofer that backs two drivers onto a common magnet structure. One smaller-diameter voice coil moves concentrically inside the other, sharing a common pole-piece, with an intervening aluminum spacer/ structure to hold the whole apparatus in alignment. This topology requires a balletic balancing of magnetic and electrical parameters like flux, resistance, reluctance, and inductance, such that two loudspeaker “motors” with necessarily very different voice-coil dimensions and air gaps maintain perfect electromagnetic balance over their full travels. While Uni-Core incorporates a deal of mechanical cleverness too, it is this high-wire act, no doubt achieved with considerable computer-simulation firepower, where the real Uni-Core magic happens.
Bu hikaye Sound & Vision dergisinin April - May 2021 sayısından alınmıştır.
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Bu hikaye Sound & Vision dergisinin April - May 2021 sayısından alınmıştır.
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The Big Clean
Chances are you probably do not think about the state of your electronic devices too often. Oh, you might think about all the upgrades you would like to make; where you would put those new tower speakers, or how a second or third subwoofer would really tame those bass modes in your room, or how much more cinematic a larger screen would be. Sure, you think about that part of your system. But how often do you think about the well-being of your system?
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