2012年4月15日日曜日

MacでRMAA: Apogee Duet2 (再測定)


オーディオインターフェイスとして、さらにヘッドフォンアンプとして、ゴキゲンに活躍中のDuet2くんです。

どれくらいゴキゲンか定量的に調べる方法はないものかしら。

ということで始めたRMAAを使った測定。
前回は、まぁこんなもんかーっていう結果でした。
やっぱりbalanced入出力でも試したいなー、と思いつつ時は過ぎ。

やっとXLR to 1/4'' TRS Connectorが入手できたので、 再測定してみました。

【結果発表】
Duet2 RMAA 24bit 44.1kHz (balanced)
Duet2 RMAA 24bit 48kHz (balanced)
Duet2 RMAA 24bit 96kHz (balanced)

注意
あくまで、うちの環境でわりかし適当に測定してみた結果です。
再生と録音がRMAAの想定しているとおりに正しく行われている確証はありません。
Duet2くんの実力全開かどうか分からない、ということです。


THD + Noiseなど全般的に良くなったようです。balanced入出力の効果アリと思っていいかと。
それでこそ、この測定以外に使わなさそうなコネクタを入手した甲斐があったというものだ...

残念ながら周波数特性の傾向は変わりませんでした。
測定方法に問題がある可能性もあるなぁ...


Thanks,


hiro

投稿者 時刻:
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Duet2 RMAA 24bit 44.1kHz (balanced)

RightMark Audio Analyzer test : duet2 44 balanced

RightMark Audio Analyzer test report

Testing device duet2 44 balanced
Sampling mode 24-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 -0.0 dB / -0.0 dB
Mono mode OFF
Calibration singal, Hz 1000
Polarity correct/correct



Summary

Frequency response (from 40 Hz to 15 kHz), dB
+0.03, -0.13
Very good
Noise level, dB (A)
-107.4
Excellent
Dynamic range, dB (A)
106.7
Excellent
THD, %
0.0007
Excellent
THD + Noise, dB (A)
-100.2
Excellent
IMD + Noise, %
0.0014
Excellent
Stereo crosstalk, dB
-108.3
Excellent
IMD at 10 kHz, %
0.0015
Excellent
General performance
Very good



Frequency response



From 20 Hz to 20 kHz, dB
-0.24, +0.03
From 40 Hz to 15 kHz, dB
-0.13, +0.03



Noise level



Left
Right
RMS power, dB
-106.3
-107.0
RMS power (A-weighted), dB
-106.9
-107.9
Peak level, dB FS
-91.1
-91.4
DC offset, %
+0.0
+0.0



Dynamic range



Left
Right
Dynamic range, dB
+106.3
+106.3
Dynamic range (A-weighted), dB
+106.7
+106.7
DC offset, %
+0.00
+0.00



THD + Noise (at -3 dB FS)



Left
Right
THD, %
+0.0008
+0.0006
THD + Noise, %
+0.0012
+0.0011
THD + Noise (A-weighted), %
+0.0010
+0.0009



Intermodulation distortion



Left
Right
IMD + Noise, %
+0.0015
+0.0013
IMD + Noise (A-weighted), %
+0.0012
+0.0012



Stereo crosstalk



Left
Right
Crosstalk at 100 Hz, dB
-113
-111
Crosstalk at 1000 Hz, dB
-108
-107
Crosstalk at 10000 Hz, dB
-106
-106



IMD (swept tones)



Left
Right
IMD + Noise at 5000 Hz,
0.0015
0.0015
IMD + Noise at 10000 Hz,
0.0015
0.0015
IMD + Noise at 15000 Hz,
0.0015
0.0015



投稿者 時刻:

Duet2 RMAA 24bit 48kHz (balanced)

RightMark Audio Analyzer test : duet2 48 balanced

RightMark Audio Analyzer test report

Testing device duet2 48 balanced
Sampling mode 24-bit, 48 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 -0.0 dB / -0.0 dB
Mono mode OFF
Calibration singal, Hz 1000
Polarity correct/correct



Summary

Frequency response (from 40 Hz to 15 kHz), dB
+0.03, -0.14
Very good
Noise level, dB (A)
-107.4
Excellent
Dynamic range, dB (A)
106.6
Excellent
THD, %
0.0007
Excellent
THD + Noise, dB (A)
-100.4
Excellent
IMD + Noise, %
0.0014
Excellent
Stereo crosstalk, dB
-106.4
Excellent
IMD at 10 kHz, %
0.0014
Excellent
General performance
Very good



Frequency response



From 20 Hz to 20 kHz, dB
-0.23, +0.03
From 40 Hz to 15 kHz, dB
-0.14, +0.03



Noise level



Left
Right
RMS power, dB
-106.3
-107.0
RMS power (A-weighted), dB
-107.0
-107.8
Peak level, dB FS
-86.9
-86.1
DC offset, %
-0.0
-0.0



Dynamic range



Left
Right
Dynamic range, dB
+106.3
+106.3
Dynamic range (A-weighted), dB
+106.6
+106.6
DC offset, %
+0.00
-0.00



THD + Noise (at -3 dB FS)



Left
Right
THD, %
+0.0008
+0.0006
THD + Noise, %
+0.0012
+0.0010
THD + Noise (A-weighted), %
+0.0010
+0.0009



Intermodulation distortion



Left
Right
IMD + Noise, %
+0.0014
+0.0013
IMD + Noise (A-weighted), %
+0.0012
+0.0011



Stereo crosstalk



Left
Right
Crosstalk at 100 Hz, dB
-115
-113
Crosstalk at 1000 Hz, dB
-105
-105
Crosstalk at 10000 Hz, dB
-106
-106



IMD (swept tones)



Left
Right
IMD + Noise at 5000 Hz,
0.0014
0.0013
IMD + Noise at 10000 Hz,
0.0014
0.0013
IMD + Noise at 15000 Hz,
0.0014
0.0013



投稿者 時刻:

Duet2 RMAA 24bit 96kHz (balanced)

RightMark Audio Analyzer test : duet2 96 balanced

RightMark Audio Analyzer test report

Testing device duet2 96 balanced
Sampling mode 24-bit, 96 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 -0.0 dB / -0.0 dB
Mono mode OFF
Calibration singal, Hz 1000
Polarity correct/correct



Summary

Frequency response (from 40 Hz to 15 kHz), dB
+0.04, -0.10
Excellent
Noise level, dB (A)
-107.5
Excellent
Dynamic range, dB (A)
107.2
Excellent
THD, %
0.0007
Excellent
THD + Noise, dB (A)
-100.6
Excellent
IMD + Noise, %
0.0014
Excellent
Stereo crosstalk, dB
-108.2
Excellent
IMD at 10 kHz, %
0.0015
Excellent
General performance
Very good



Frequency response



From 20 Hz to 20 kHz, dB
-0.24, +0.04
From 40 Hz to 15 kHz, dB
-0.10, +0.04



Noise level
Left
Right
RMS power, dB
-106.3
-107.0
RMS power (A-weighted), dB
-107.0
-108.0
Peak level, dB FS
-82.1
-81.9
DC offset, %
-0.0
-0.0



Dynamic range
Left
Right
Dynamic range, dB
+106.5
+106.5
Dynamic range (A-weighted), dB
+107.1
+107.2
DC offset, %
+0.00
+0.00



THD + Noise (at -3 dB FS)
Left
Right
THD, %
+0.0008
+0.0006
THD + Noise, %
+0.0011
+0.0010
THD + Noise (A-weighted), %
+0.0010
+0.0009



Intermodulation distortion
Left
Right
IMD + Noise, %
+0.0014
+0.0013
IMD + Noise (A-weighted), %
+0.0012
+0.0011



Stereo crosstalk
Left
Right
Crosstalk at 100 Hz, dB
-106
-106
Crosstalk at 1000 Hz, dB
-107
-108
Crosstalk at 10000 Hz, dB
-104
-104



IMD (swept tones)
Left
Right
IMD + Noise at 5000 Hz,
0.0015
0.0014
IMD + Noise at 10000 Hz,
0.0015
0.0014
IMD + Noise at 15000 Hz,
0.0015
0.0014



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