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本帖最后由 dongbei 于 2009-4-5 17:14 编辑
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请看安装了老驱动后的RMAA测试情况
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& {- N. \- z3 ?: ~& K9 Y* hTesting device Sound Blaster X-Fi Xtreme Audio . `9 q* f3 a' y1 |, d
Sampling mode 16-bit, 44 kHz q2 y" Y6 C. R8 z8 V
Interface MME 6 c# ]# g* ~% P+ `6 Y
Testing chain External loopback (line-out - line-in) ( W. h2 ^% S7 p/ V! y# C1 n3 P
RMAA Version 6.2.1
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1 D! c& e( ?! x: f) @20 Hz - 20 kHz filter ON
+ b" }: }' F8 j0 C" {, J1 g- H3 I5 SNormalize amplitude OFF 2 t1 C- q; L4 T$ Z3 l3 D
Level change -2.0 dB / -1.9 dB
' P& H W8 X7 F I) |! P" l& HMono mode OFF
) h0 [( L+ s# n$ f7 HCalibration singal, Hz 1000 - ^ O0 E8 \ S C. n' \8 L
Polarity inverted/inverted : n5 O& B& P/ ^! f$ {
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Summary
& g( k, o* P0 VFrequency response (from 40 Hz to 15 kHz), dB +0.68, -1.45 Average ; O& Y3 r1 \2 ^# X% _! u
Noise level, dB (A) -106.0 Excellent
5 }6 V3 R2 Z5 d) b. _& N2 y4 tDynamic range, dB (A) 93.7 Very good
5 B1 Z9 q: u/ [6 _1 |! NTHD, % 0.0033 Very good , P5 ?4 D( `2 O% w
THD + Noise, dB (A) -84.6 Good
* A' f- F+ ?+ ?IMD + Noise, % 0.0070 Excellent 太好了! t6 @* i/ I' L( K; Y t
Stereo crosstalk, dB -72.6 Good , ~/ g. @, t ^4 d# s4 W
IMD at 10 kHz, % 0.0089 Very good 非常好
8 F8 [' J5 z2 ^5 [+ B& P& r7 ^General performance Very good
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IMD 在10KHZ的位置 一个在天,一个在地,差别如此悬殊,问题在哪里?
~0 d5 `7 j2 S! }) @* H- n我不懂,我只是偶然发现了这个问题。[img][/img] |
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