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发表于 2005-1-13 23:22:06
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其实主观测试固然重要,客观测试也不可少哦,示波器不一定就能说明全部问题的!
人家super macro可是提供了RMAA测试指标,希望看见easya2的!谢谢!!
Benchmarks (tested with EMU1212M audio card and RMAA):
While using batteries in battery-save mode
Frequency response (from 40 Hz to 15 kHz), dB: +0.02, -0.12 Excellent
Noise level, dB (A): -100.5 Excellent
Dynamic range, dB (A): 100.4 Excellent
THD, %: 0.0009 Excellent
IMD, %: 0.0038 Excellent
Stereo crosstalk, dB: -98.2 Excellent
While using the included AC adapter (high-current, wide-bandwidth mode)
Frequency response (from 40 Hz to 15 kHz), dB: +0.02, -0.12 Excellent
Noise level, dB (A): -100.5 Excellent
Dynamic range, dB (A): 100.4 Excellent
THD, %: 0.0004 Excellent
IMD, %: 0.0036 Excellent
Stereo crosstalk, dB: -98.3 Excellent
EMU1212M audio card without amp
Frequency response (from 40 Hz to 15 kHz), dB: +0.03, -0.21 Very good
Noise level, dB (A): -107.1 Excellent
Dynamic range, dB (A): 107.1 Excellent
THD, %: 0.0003 Excellent
IMD, %: 0.0015 Excellent
Stereo crosstalk, dB: -97.6 Excellent
As you can see, SuperMacro's distortion and channel crosstalk are almost as low as the best audio card can detect. The channel crosstalk increase above 10Khz is introduced by the 3-ft connection cable, not by the amp. The -0.12dB drop at high-end frequency is also caused by the EMU audio card, not by the amp. |
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