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发表于 2026-2-9 14:41:05
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首先,可以参考stereophile或者别的机构的对于功放噪音的测试,虽然不等于底噪,但是有底噪的这项不可能非常优秀,比方progression功放只有58db。
s350
, the S350 enjoys both lower noise and a wider 82.8dB A-wtd S/N ratio (re. 0dBW). The original Progression Stereo offered a lower 79.6dB but, as a rule, none of D'Agostino's power amps are designed with very low noise in mind (~85dB re. 0dBW is a target figure for today's amplifiers).
progrerssion
Measured with the input shorted to ground, the Progression offered a wideband, unweighted signal/noise ratio of 57.5dB, ref. 1W into 8 ohms. This was primarily due to the presence of noise with a center frequency of 923kHz. Concerned that the amplifier was picking up some RF interference that was being demodulated, I turned off all the CFC and LED lights in my test lab, but the noise persisted. The ratio improved to 80.1dB when the measurement bandwidth was restricted to 22Hz–22kHz, and to 87dB when the reading was A-weighted. The blue trace in fig.3, taken at 1W into 8 ohms, reveals that the primary source of noise is magnetic interference at 60Hz and its odd-order harmonics, presumably stemming from that massive toroidal transformer. However, at higher powers (red trace), the spuriae at 120Hz and its harmonics increase in level.
bat和大丹都是底噪比较高的。
a类里面,测试出来金嗓子和贵丰是底噪比较小的,无计权也有85db以上了。
不过就算是金嗓子,如果把耳朵贴近高音单元也可能会有嘶嘶声。这个可能和功放底噪,地线回路等都有关系,可以排除法搞一下。 |
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