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03

2013-Jun

Measurements Astell&Kern AK120

Nick Name: Golden Ears Registered Date: Jun 03, 2013, 18:44:28 IP ADRESS: *.56.123.5 Views: 19536

 00.Astell&Kern_ak120.png

 

 

아스텔앤컨 (Astell&Kern) AK120 리뷰 - 측정편 : d01fd8725d6667fb653ace7d3d7dd01b.png  

* Golden Ears Philosophy

* How we measure (Phones, DAPs, Amplifiers)

* How to read measurements - Phones, DAPs, Amplifiers

* Distortion and the Data

* Frequency response & perceived sound 

 

 Note.

Please keep in mind that the following data are from a test unit reviewed by Golden Ears - the test unit is not necessarily a representative sample of the model being reviewed. 

 

 

 아스텔앤컨 (Astell&Kern) AK120 리뷰 - 측정편 : c10411123335d3e71c91b64dd44fe434.png

1. WAV Test Result (Lossless File)

1.1 16bit-44.1kHz Test Signal

 01.16bit44.1kHz_fr.png

 16bit, 44.1kHz / Astell&Kern AK120

 

Frequency response (from 40 Hz to 15 kHz), dB
+0.01, -0.08
Excellent
Noise level, dB (A)
-97.3
Excellent
Dynamic range, dB (A)
96.9
Excellent
THD, %
0.0006
Excellent
THD + Noise, dB (A)
-90.7
Very good
IMD + Noise, %
0.0042
Excellent
Stereo crosstalk, dB
-97.0
Excellent
IMD at 10 kHz, %
0.0041
Excellent

 

  1.2 24bit-192kHz Test Signal

 02.24bit192kHz_fr.png

 24bit, 192kHz / Astell&Kern AK120

 

Frequency response (from 40 Hz to 15 kHz), dB
+0.00, -0.03
Excellent
Noise level, dB (A)
-114.2
Excellent
Dynamic range, dB (A)
114.4
Excellent
THD, %
0.0005
Excellent
THD + Noise, dB (A)
-101.7
Excellent
IMD + Noise, %
0.0032
Excellent
Stereo crosstalk, dB
-110.5
Excellent
IMD at 10 kHz, %
0.0008
Excellent

 

2. Lossy File Test Result

 03.Encoding_fr.png

 Sampling Frequency : 44.1kHz / Astell&Kern AK120

 

Test AK120 Wav AK120 WMA VBRQ98 AK120 OGG VBRQ10 AK120 MP3 CBR320
Frequency response (from 40 Hz to 15 kHz), dB: +0.01, -0.10 +0.21, -0.41 +0.10, -0.24 +0.05, -0.35
Noise level, dB (A): -114.0 -112.6 -106.9 -98.9
Dynamic range, dB (A): 114.0 80.2 94.8 101.2
THD, %: 0.0006 0.0015 0.0011 0.0010
IMD + Noise, %: 0.0018 5.377 0.319 0.011
Stereo crosstalk, dB: -113.1 -107.6 -107.1 -98.0

 

3. Optical Input Test Result (24bit-96kHz Test Signal)

 04.Optical_fr.png

  Sampling Frequency: 96kHz / Optical In

 

Frequency response (from 40 Hz to 15 kHz), dB
+0.00, -0.01
Excellent
Noise level, dB (A)
-113.7
Excellent
Dynamic range, dB (A)
113.6
Excellent
THD, %
0.0005
Excellent
THD + Noise, dB (A)
-89.8
Good
IMD + Noise, %
0.0060
Excellent
Stereo crosstalk, dB
-109.0
Excellent
IMD at 10 kHz, %
0.0055
Excellent

 

  

Amplifier Test

A given headphone output may accommodate many different headphones - in general, a smaller load impedance (on headphones) will lead to a larger sound, but at cost of accuracy in measurable data due to the increased current - this cost usually manifests in an increasingly weak bass and elevated crosstalk values as the load impedance decreases. The purpose of the tests to follow is to see how these values change as a function of impedance.

 

 05.Load_fr.png

R16:16Ω / R33:33Ω / R62:62Ω / R250:250Ω

Sampling Frequency : 44.1kHz / Astell&Kern - AK120

 

Test AK120 R250 AK120 R62 AK120 R33 AK120 R16
Frequency response (from 40 Hz to 15 kHz), dB: +0.01, -0.10 +0.01, -0.10 +0.01, -0.10 +0.01, -0.10
Noise level, dB (A): -111.2 -111.1 -111.0 -110.8
Dynamic range, dB (A): 111.1 110.9 110.9 110.8
THD, %: 0.0023 0.0073 0.013 0.021
IMD + Noise, %: 0.0025 0.0071 0.012 0.020
Stereo crosstalk, dB: -96.8 -97.2 -79.4 -66.4

R16:16Ω / R33:33Ω / R62:62Ω / R250:250Ω

Test Mode : 24bit, 44.1kHz

 

 

Output Impedance

A lower impedance is desirable on the headphone outputs of amplifiers. The output impedance is closely related to the damping factor, and is one of the most important parameters that determine headphones' performance - desktop amps tend to exhibit high impedance values, corresponding to poor performance.

 

Interaction between output impedance and phones  

 

06.png

 Creative Commons License
Images, text and measured data by Golden Ears Corporation is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.

 

Golden Ears Test System - for more information (Link)
1. HATS: Bruel & Kjær - Head and Torso Simulator Type 4128C
2. Microphone Amplifier: Bruel & Kjær - NEXUS Conditioning Amplifier 
3. Audio Interface: Lynx L22
4. DAC: Golden Ears D/A Converter
5. Headphone Amplifier: Golden Ears Headphone Amplifier 

How we test
1. Headphone / Earphone
2. Speaker
3. Amplifier / DAP
 

How to read G.E. Graph
1. Earphone / Headphone
2. Speaker (Directivity Pattern)
3. DAP / Amplifier

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5

COMMENTED

Measurements SONY PHA-1

  • Registered Date: Feb 20, 2013

26978

VIEWS

4

COMMENTED

Pictures SONY PHA-1

  • Registered Date: Feb 20, 2013

16500

VIEWS

2

COMMENTED

Measurements Grace Design m903

  • Registered Date: Mar 23, 2012

21100

VIEWS

13

COMMENTED

  • Registered Date: Mar 23, 2012

22222

VIEWS

3

COMMENTED

  • Registered Date: Feb 15, 2012

25219

VIEWS

4

COMMENTED

  • Registered Date: Feb 15, 2012

28386

VIEWS

3

COMMENTED

  • Registered Date: Oct 31, 2011

20105

VIEWS

4

COMMENTED

  • Registered Date: Oct 31, 2011

14737

VIEWS

7

COMMENTED

  • Registered Date: Oct 13, 2011

20741

VIEWS

4

COMMENTED

  • Registered Date: Oct 13, 2011

26097

VIEWS

6

COMMENTED

Measurements Audinst HUD MX-1

  • Registered Date: Oct 13, 2011

27746

VIEWS

5

COMMENTED