本帖最后由 八股文声学 于 2017-1-14 01:33 编辑
根据Prism Sound提供的标准测试要求,YGG大部分的测试指标都不及格。作为一个R2R的解码器,其与THD相关的部分基本无法通过标准测试要求。并且平衡接口的输出电平略低于标准电平值,也没有通过测试。
需要说明的是本实验室测得数据与Schiit官网数据有比较大的偏差,谨慎起见本实验室使用同样的设定测试了其他几台解码器,基本与官网公布数据类似,或者达到dScope III的测试下限,无法得到真实指标。所以评估下来不应该为配置失误。不过还是要重申本实验室观点:声音好,数据不差;数据差,声音不好;数据好,声音未必好。YGG作为本实验室的参考解码,声音远远好于在数据上秒杀YGG的若干个千元解码。
通过2016年大半年的摸索,本实验室倾向于认为对于解码器产品,其声音水准更多取决于算法而非物理指标。而算法无法通过实验室设备进行测定。
SAMPLE TESTS ANALOGUE REPORT Notes:
YGG
Overall Result: FAIL
SUMMARY: | RESULT | 001 A01 Ampl, Phase, Gain | | 002 A02 Ampl, Phase vs Freq | | 003 A03 Gain vs Ampl | | 004 A04 THD+N,THD, nth-HD | | 005 A05 THD+N vs Freq | | 006 A06 THD+N vs Ampl | | 007 A07 Noise, SNR | | 008 A08 Crosstalk A to B | | 009 A09 Crosstalk B to A | | 010 A10 Crosstalk A to B vs Freq | | 011 A11 Crosstalk B to A vs Freq | | 012 A12 IMD SMPTE-DIN | | KEY: √ = Test passes, X = Test fails, OK = Test has run but has no limit checking, (X) = Test has failed to run or has not completed,
[√] = Test passes but is not required, [X] = Test fails but is not required, ? = Test is required but has not been run.
- = Test is not required.
Back to top
001 A01 Ampl, Phase, Gain: FAILED
Measured at 2017/1/12 18:35:52
Generator Settings | Channel A: | sine, 0 dBu at 1000 Hz | Channel B: | sine, 0 dBu at 1000 Hz |
Signal Analyzer Readings | RMS amplitude (Channel A) | -3.225 dBu | < 3 dBu
> -3 dBu | RMS amplitude (Channel B) | -3.230 dBu | < 3 dBu
> -3 dBu | Inter-channel phase | -.01 ? | < 10 ?
> -10 ? |
CTA Readings | Gain (Channel A RMS) | -3.225 dB | < 3 dB
> -3 dB | Gain (Channel B RMS) | -3.230 dB | < 3 dB
> -3 dB | Settings: Generator relative, 22 Hz - 22 kHz, unweighted RMS with 1/3rd octave band-pass filter at the generator frequency |
Back to top
002 A02 Ampl, Phase vs Freq: PASSED
Measured at 2017/1/12 18:35:55
Generator Settings | Channel A: | sine, 0 dBu at 1000 Hz | Channel B: | sine, 0 dBu at 1000 Hz
|
Back to top
003 A03 Gain vs Ampl: FAILED
Measured at 2017/1/12 18:36:06
Generator Settings | Channel A: | sine, 0 dBu at 1000 Hz | Channel B: | sine, 0 dBu at 1000 Hz |
Ch A Sweep of CT Det : Gain : Ch A has breached its minimum limit line.
Ch B Sweep of CT Det : Gain : Ch B has breached its minimum limit line.
Back to top
004 A04 THD+N,THD, nth-HD: FAILED
Measured at 2017/1/12 18:36:14
Generator Settings | Channel A: | sine, 0 dBu at 1000 Hz | Channel B: | sine, 0 dBu at 1000 Hz |
CTA Readings | THD+N - relative (Channel A RMS) | -68.956 dB | < -80 dB
| THD+N - relative (Channel B RMS) | -72.424 dB | < -80 dB
| Settings: Self relative, 22 Hz - 22 kHz, unweighted RMS with 1/3rd octave band-reject filter at the generator frequency |
FFT Detector Readings | THD (Channel A) | -82.649 dB | < -80 dB
| THD (Channel B) | -79.743 dB | < -80 dB
| FFTD 1 Settings: Self relative, 22 Hz - 22 kHz, unweighted with band-pass notch filters from the 2nd to 10th harmonics | | 2nd Harmonic Distortion (Channel A) | -99.530 dB | < -80 dB
| 2nd Harmonic Distortion (Channel B) | -86.199 dB | < -80 dB
| FFTD 2 Settings: Self relative, 22 Hz - 22 kHz, unweighted with band-pass notch filter at the 2nd harmonic | | 3rd Harmonic Distortion (Channel A) | -90.877 dB | < -80 dB
| 3rd Harmonic Distortion (Channel B) | -94.266 dB | < -80 dB
| FFTD 3 Settings: Self relative, 22 Hz - 22 kHz, unweighted with band-pass notch filter at the 3rd harmonic | |
Back to top
005 A05 THD+N vs Freq: FAILED
Measured at 2017/1/12 18:36:21
Generator Settings | Channel A: | sine, 0 dBu at 1000 Hz | Channel B: | sine, 0 dBu at 1000 Hz |
Ch A Sweep of CT Det : THD+N - relative : Ch A has breached its maximum limit line.
Ch B Sweep of CT Det : THD+N - relative : Ch B has breached its maximum limit line.
Back to top
006 A06 THD+N vs Ampl: FAILED
Measured at 2017/1/12 18:36:53
Generator Settings | Channel A: | sine, 0 dBu at 1000 Hz | Channel B: | sine, 0 dBu at 1000 Hz |
Ch A Sweep of CT Det : THD+N - relative : Ch A has breached its maximum limit line.
Ch B Sweep of CT Det : THD+N - relative : Ch B has breached its maximum limit line.
Back to top
007 A07 Noise, SNR: FAILED
Measured at 2017/1/12 18:37:20
Generator Settings | Channel A: | sine, -60 dBFS at 1000 Hz | Channel B: | sine, -60 dBFS at 1000 Hz |
FFT Detector Readings | Noise (unweighted) (Channel A) | -87.214 dBu | < -80 dBu
| Noise (unweighted) (Channel B) | -79.150 dBu | < -80 dBu
| FFTD 1 Settings: 22 Hz - 22 kHz, unweighted with window notch (14 bins) band-reject filter at the generator frequency | | SNR (Channel A) | -105.270 dBr | < -80 dBr
| SNR (Channel B) | -97.246 dBr | < -80 dBr
| FFTD 2 Settings: 22 Hz - 22 kHz, unweighted with 1/3rd octave band-reject filter at the generator frequency | |
Back to top
008 A08 Crosstalk A to B: PASSED
Measured at 2017/1/12 18:37:23
Generator Settings | Channel A: | sine, 0 dBu at 1000 Hz | Channel B: | Off |
CTA Readings | Cross-talk (Channel B RMS) | -135.392 dB | < -80 dB
| Settings: Channel relative, 22 Hz - 22 kHz, unweighted RMS with 1/24th octave band-pass filter at the opposite channel generator frequency |
Back to top
009 A09 Crosstalk B to A: PASSED
Measured at 2017/1/12 18:37:28
Generator Settings | Channel A: | Off | Channel B: | sine, 0 dBu at 1000 Hz |
CTA Readings | Cross-talk (Channel A RMS) | -138.703 dB | < -80 dB
| Settings: Channel relative, 22 Hz - 22 kHz, unweighted RMS with 1/24th octave band-pass filter at the opposite channel generator frequency |
Back to top
010 A10 Crosstalk A to B vs Freq: PASSED
Measured at 2017/1/12 18:37:33
Generator Settings | Channel A: | sine, 0 dBu at 1000 Hz | Channel B: | Off |
Back to top
011 A11 Crosstalk B to A vs Freq: PASSED
Measured at 2017/1/12 18:37:47
Generator Settings | Channel A: | Off | Channel B: | sine, 0 dBu at 1000 Hz |
Back to top
012 A12 IMD SMPTE-DIN: PASSED
Measured at 2017/1/12 18:37:56
Generator Settings | Channel A: | Twin-tone, 0 dBu at 60 Hz and .25 amplitude ratio at 7000Hz | Channel B: | Twin-tone, 0 dBu at 60 Hz and .25 amplitude ratio at 7000Hz |
FFT Detector Readings | IMD SMPTE-DIN (Channel A) | -86.362 dB | < -80 dB
| IMD SMPTE-DIN (Channel B) | -84.079 dB | < -80 dB
| FFTD 1 Settings: Self relative, 22 Hz - 22 kHz, unweighted with intermodulation notch band reject | |
|