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harryytm

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51# 跳轉到 »
發表於 2011-1-26 17:24 | 只看該作者
本帖最後由 harryytm 於 2011-1-26 17:35 編輯

回復 50# bennetng

RightMark Audio Analyzer test report
Testing deviceRCA Out 44.1KHz
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 change0.3 dB / 0.2 dB
Mono modeOFF
Calibration singal, Hz1000
Polarity correct/correct



Summary
Frequency response (from 40 Hz to 15 kHz), dB

+0.02, -0.13

Very good

Noise level, dB (A)

-96.1

Excellent

Dynamic range, dB (A)

96.6

Excellent

THD, %

0.0005

Excellent

THD + Noise, dB (A)

-90.3

Very good

IMD + Noise, %

0.0042

Excellent

Stereo crosstalk, dB

-83.8

Very good

IMD at 10 kHz, %

0.0045

Excellent

General performance

Very good


Frequency response

From 20 Hz to 20 kHz, dB

-0.25, +0.02

From 40 Hz to 15 kHz, dB

-0.13, +0.02

Noise Level


Left

Right

RMS power, dB

-95.1

-95.1

RMS power (A-weighted), dB

-96.1

-96.1

Peak level, dB FS

-82.4

-82.9

DC offset, %

-0.0

-0.0

Dynamic range


Left

Right

Dynamic range, dB

+95.7

+95.5

Dynamic range (A-weighted), dB

+96.8

+96.5

DC offset, %

-0.00

-0.00

THD + Noise (at -3 dB FS)


Left

Right

THD, %

+0.0005

+0.0005

THD + Noise, %

+0.0034

+0.0034

THD + Noise (A-weighted), %

+0.0030

+0.0031

Intermodulation distortion


Left

Right

IMD + Noise, %

+0.0043

+0.0042

IMD + Noise (A-weighted), %

+0.0038

+0.0038

Stereo crosstalk


Left

Right

Crosstalk at 100 Hz, dB

-97

-97

Crosstalk at 1000 Hz, dB

-83

-83

Crosstalk at 10000 Hz, dB

-63

-64


IMD (swept tones)


Left

Right

IMD + Noise at 5000 Hz,

0.0044

0.0046

IMD + Noise at 10000 Hz,

0.0044

0.0044

IMD + Noise at 15000 Hz,

0.0046

0.0046
附件: 您需要登錄才可以下載或查看附件。沒有帳號？註冊

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RoyalHorse

52#
發表於 2011-1-26 17:34 | 只看該作者
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peter627

Rank: 1
53#
發表於 2011-1-26 17:37 | 只看該作者
回復 52# RoyalHorse

因為火牛有4路供電
拉條獨立出黎測RMAA
noise level有提升

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harryytm

Rank: 4Rank: 4Rank: 4Rank: 4
54#
發表於 2011-1-26 17:41 | 只看該作者
本帖最後由 harryytm 於 2011-1-26 17:43 編輯
請問 d 底噪係唔係好明顯 ka
會唔會係我自已隻耳聽唔到 ???
我用 IE8 and Z1000  ...
GOD_DAMNIT 發表於 2011-1-26 16:18



    我用緊Philips SHE9700，D噪聲好明顯ga，唔播任何野將44.1KHz轉做48KHz會很明顯聽到變得很靜。

Philips SHE9700參考：
頻率響應: 6 - 23 500 Hz
阻抗: 16 Ohm
最大電量輸入: 50 mW
敏感度: 103 dB

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wing0603

55#
發表於 2011-1-26 17:47 | 只看該作者
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harryytm

Rank: 4Rank: 4Rank: 4Rank: 4
56#
發表於 2011-1-26 17:48 | 只看該作者
本帖最後由 harryytm 於 2011-1-26 17:58 編輯

回復 50# bennetng

RightMark Audio Analyzer test report
Testing deviceRCA Out 48KHz
Sampling mode16-bit, 48 kHz
Interface
Testing chainExternal loopback (line-out - line-in)
RMAA Version6.2.3


20 Hz - 20 kHz filterON
Normalize amplitudeON
Level change0.3 dB / 0.2 dB
Mono modeOFF
Calibration singal, Hz1000
Polarity correct/correct



Summary
Frequency response (from 40 Hz to 15 kHz), dB

+0.02, -0.13

Very good

Noise level, dB (A)

-97.1

Excellent

Dynamic range, dB (A)

97.0

Excellent

THD, %

0.0008

Excellent

THD + Noise, dB (A)

-90.6

Very good

IMD + Noise, %

0.0040

Excellent

Stereo crosstalk, dB

-83.4

Very good

IMD at 10 kHz, %

0.0042

Excellent

General performance

Very good


Frequency response


From 20 Hz to 20 kHz, dB

-0.24, +0.02

From 40 Hz to 15 kHz, dB

-0.13, +0.02




Noise level



Left

Right

RMS power, dB

-96.0

-96.2

RMS power (A-weighted), dB

-97.0

-97.1

Peak level, dB FS

-83.2

-83.2

DC offset, %

-0.0

-0.0




Dynamic range



Left

Right

Dynamic range, dB

+96.2

+96.0

Dynamic range (A-weighted), dB

+97.1

+96.9

DC offset, %

-0.00

-0.00




THD + Noise (at -3 dB FS)



Left

Right

THD, %

+0.0008

+0.0008

THD + Noise, %

+0.0032

+0.0033

THD + Noise (A-weighted), %

+0.0029

+0.0030




Intermodulation distortion



Left

Right

IMD + Noise, %

+0.0040

+0.0040

IMD + Noise (A-weighted), %

+0.0035

+0.0035




Stereo crosstalk



Left

Right

Crosstalk at 100 Hz, dB

-99

-97

Crosstalk at 1000 Hz, dB

-82

-83

Crosstalk at 10000 Hz, dB

-63

-63


IMD (swept tones)



Left

Right

IMD + Noise at 5000 Hz,

0.0042

0.0043

IMD + Noise at 10000 Hz,

0.0042

0.0042

IMD + Noise at 15000 Hz,

0.0042

0.0042
附件: 您需要登錄才可以下載或查看附件。沒有帳號？註冊

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harryytm

Rank: 4Rank: 4Rank: 4Rank: 4
57#
發表於 2011-1-26 17:56 | 只看該作者
回復  harryytm
有冇試過其他耳機or拎你條耳機係第二到試去比較?
wing0603 發表於 2011-1-26 17:47


我試過用audio-technica ATH-AD300試過聽唔到有噪聲，但Philips SHE9700就聽到，部機D設定碰都沒碰過。

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peter627

Rank: 1
58#
發表於 2011-1-26 18:08 | 只看該作者
落抗阻線可以reduce個底噪

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RoyalHorse

59#
發表於 2011-1-26 18:26 | 只看該作者
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harryytm

Rank: 4Rank: 4Rank: 4Rank: 4
60#
發表於 2011-1-26 18:28 | 只看該作者
本帖最後由 harryytm 於 2011-1-26 18:30 編輯

回復 59# RoyalHorse


又如何解釋改變Sample Rate可以令噪聲消失呢？
是線路問題，還是軟件問題？

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