我的第三版 PCM1794。
不依不饶，进行到底，这是第三版的PCM1794，这块PCB做了两台机，一台使用PCM1798芯片，另一台使用PCM1794芯片。PCM1794果然不忽悠，在测试指标上虽然与PCM1798相差很细微，但听感更好。
RightMark Audio Analyzer test report
Testing devicePCM1794
Sampling mode16-bit, 44 kHz
Interface
Testing chainExternal loopback (line-out - line-in)
RMAA Version6.2.3
20 Hz - 20 kHz filterON
Normalize amplitudeON
Level change0.1 dB / 0.0 dB
Mono modeOFF
Calibration singal, Hz1000
Polaritycorrect/correct
Summary
Frequency response (from 40 Hz to 15 kHz), dB+0.01, -0.08Excellent
Noise level, dB (A)-97.1Excellent
Dynamic range, dB (A)96.6Excellent
THD, %0.0018Excellent
THD + Noise, dB (A)-88.5Good
IMD + Noise, %0.0044Excellent
Stereo crosstalk, dB-97.4Excellent
IMD at 10 kHz, %0.012Very good
General performance
Excellent
Frequency response
From 20 Hz to 20 kHz, dB-0.16, +0.01
From 40 Hz to 15 kHz, dB-0.08, +0.01
Noise level
LeftRight
RMS power, dB-95.5-95.6
RMS power (A-weighted), dB-97.1-97.1
Peak level, dB FS-82.5-86.9
DC offset, %-0.0-0.0
Dynamic range
LeftRight
Dynamic range, dB+95.5+95.5
Dynamic range (A-weighted), dB+96.6+96.5
DC offset, %-0.00-0.00
THD + Noise (at -3 dB FS)
LeftRight
THD, %+0.0014+0.0022
THD + Noise, %+0.0036+0.0040
THD + Noise (A-weighted), %+0.0034+0.0041
Intermodulation distortion
LeftRight
IMD + Noise, %+0.0044+0.0045
IMD + Noise (A-weighted), %+0.0038+0.0039
Stereo crosstalk
LeftRight
Crosstalk at 100 Hz, dB-95-95
Crosstalk at 1000 Hz, dB-96-97
Crosstalk at 10000 Hz, dB-91-90
IMD (swept tones)
LeftRight
IMD + Noise at 5000 Hz,0.00520.0055
IMD + Noise at 10000 Hz,0.00940.0091
IMD + Noise at 15000 Hz,0.02200.0208
这太专业了，有广告的味道 再上一图。 晶振的位置是不是可以搞大点， 我问过几家卖晶振的人，他们说，现在的晶振都很稳定，现代的晶振最比较小，工艺也很好，相对来说，大的晶振是比较旧的生产工艺，性能还没有小的好。
当然，这是一般的说法啦，如果真要纠结这个问题，那就纠结吧。:loveliness: 晶振多余了 拆掉吧 USB的芯片太低端了怎么着也的上个6631吧 别介意说说而已板子做的不错 顶，测试结果很不错哟！支持！
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