Zune 30G的RMAA测试

zune

寒假回家做了下RMAA测试，录音卡是创新X-Fi ExtremeMusic（版本号SB0460)，此卡无需多解释，虽然比在学校时用的X-Fi Elite Pro差很多，但是录音时-100dB的本底噪声和100+dB的动态还是有的（24bit，当然）。操作系统WinXP SP2，音源Zune 一代30GB。
噪声和动态以及立体分离在移动设备中算很好的了，并且频响出乎预料的直，且正好在20K这个节点后快速衰减，算是很理想的曲线。
我觉得还是配个暖声且解析高的塞子才能显现出这个机器的特点。

RightMark Audio Analyzer test report

Testing device Zune 44KHz,16bit
Sampling mode 16-bit, 44 kHz
Interface  
Testing chain External loopback (line-out - line-in)
RMAA Version 6.2.3
  
  
20 Hz - 20 kHz filter ON
Normalize amplitude ON
Level change -5.6 dB / -5.5 dB
Mono mode OFF
Calibration singal, Hz 1000
Polarity  inverted/inverted



Summary Frequency response (from 40 Hz to 15 kHz), dB +0.06, -0.25
Very good

Noise level, dB (A) -90.3
Very good

Dynamic range, dB (A) 90.4
Very good

THD, % 0.0044
Very good

THD + Noise, dB (A) -77.6
Average

IMD + Noise, % 0.016
Very good

Stereo crosstalk, dB -89.3
Excellent

IMD at 10 kHz, % 0.014
Very good

General performance
Very good



Frequency response

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2010-1-28 12:36

From 20 Hz to 20 kHz, dB -0.60, +0.06

From 40 Hz to 15 kHz, dB -0.25, +0.06




Noise level

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2010-1-28 12:36

Left
Right

RMS power, dB -88.9
-88.8

RMS power (A-weighted), dB -90.4
-90.3

Peak level, dB FS -70.9
-72.2

DC offset, % -0.0
-0.0




Dynamic range

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2010-1-28 12:36

Left
Right

Dynamic range, dB +89.0
+88.9

Dynamic range (A-weighted), dB +90.4
+90.3

DC offset, % -0.01
-0.01




THD + Noise (at -3 dB FS)

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2010-1-28 12:36

Left
Right

THD, % +0.0043
+0.0045

THD + Noise, % +0.0139
+0.0141

THD + Noise (A-weighted), % +0.0132
+0.0133




Intermodulation distortion

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2010-1-28 12:36

Left
Right

IMD + Noise, % +0.0161
+0.0162

IMD + Noise (A-weighted), % +0.0132
+0.0132




Stereo crosstalk

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2010-1-28 12:36

Left
Right

Crosstalk at 100 Hz, dB -81
-84

Crosstalk at 1000 Hz, dB -88
-88

Crosstalk at 10000 Hz, dB -87
-87




IMD (swept tones)

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2010-1-28 12:36

Left
Right

IMD + Noise at 5000 Hz,  0.0136
0.0140

IMD + Noise at 10000 Hz,  0.0132
0.0132

IMD + Noise at 15000 Hz,  0.0132
0.0138