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原文:“The KEF LS50 is a respected, Class A, reference-quality minimonitor—but it sounded strangely wrong with the First Watt J2. The Trashmen's iconic "Surfin' Bird" (7" 45rpm, Garrett GA-4002) played with strength and force, but its tonal balance was skewed: The lower octaves were eviscerated. My favorite Professor Longhair song, "Cry to Me," from his Live on the Queen Mary (CD, Harvest SW-11790), sounded almost rinky-dink—like a car radio. The Professor's left hand sounded as if it was playing a toy piano, as whatever keyboard he played with his right hand went in and out of focus.
When John Atkinson measured the KEF, he noted that "the LS50's impedance . . . drops to 4 ohms at 200Hz and to 5.4 ohms at the top of the audioband. The electrical phase angle is generally mild, but the combination of 5.3 ohms and –41° at 135Hz, a frequency where music often has high energy, will make the speaker work at its best with a good, 4 ohm–rated amplifier." The J2 is clearly not that amplifier. ”
看美国stereophile杂志,虽然测试的是firstwatt j2放大器,但顺便与ls50搭配了一下,据说非常不协调,其中提到一点,说ls50最低阻抗接近4欧,而且是在低频的常听带域大约135hz左右伴随着相位偏移了差不多41度——尽管firstwatt的控制力和驱动力本来就不太好,但仍旧反映出Ls50其实不好推,需要强大的驱动力和控制力的放大器进行匹配。 |
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