本帖最后由 snova 于 2018-6-21 15:27 编辑
您需要 登录 才可以下载或查看，没有帐号？注册
在2018年有如此的DAC，真是刷新听众的三观啊，文末评语：Most of the questionable aspects of the Aqua Formula xHD's measured performance stem from its lack of a reconstruction filter. But its poor rejection of word-clock jitter, and that inadequate transformer used to implement the balanced outputs, are flaws that should have been avoided.—John Atkinson
https://www.stereophile.com/cont ... cessor-measurements
When I tested the Formula xHD's harmonic distortion from its balanced outputs, I got a surprise: With the 50Hz tone I usually use, the distortion was extremely high. Even at –3dBFS into 100k ohms (fig.9), the third harmonic lay at just –20dB (10%), which will be very audible.
Fig.9 Aqua Formula xHD, balanced output, spectrum of 50Hz sinewave, DC–1kHz, at –3dBFS into 100k ohms (left channel blue, right red; linear frequency scale).