Measurement's report Cowon D2 Plus test and graphs - Reference Audio Analyzer

Cowon D2 Plus is available in reports and services. You are in a professional report.



Information for entry level users

report for a newbie
(Headphone amplifier)

General recommendations

The automatic selection of the optimal AMP models

Information for all

Comparison of on-line graphs


Reports / Cowon / D2 Plus / Amplifier path / report for a pro

Test report Cowon D2 Plus (report for a pro)






Test report - general data of Cowon D2 Plus as AMP mode

Frequency response, Impedance and Frequency response with standard headphones


Graphics setting view
Range, dB:

The maximum level of voltage from the musical power



General results
General results
Cowon D2 Plus
Channel
Left
Average variation in FR in the band 40 Hz to 15 kHz, dB
-0,08, 0,08
Average value of impedance band in 40 Hz to 15 kHz, ohm
2,3
Max voltage output
VRMS
dBV
Maximum current output at loaded
ohm
mA
Max power output
ohm
mW
dBm

The table shows a most important technical characteristics of Cowon D2 Plus



Test conditions
  • For record of test signals RAA was used ADC: E-MU 1616m
  • During tests RAA software-hardware measuring complex was used galvanic isolated power transformer and was excluded the effect of ground loop in the spectra



Frequency response of Cowon D2 Plus as AMP mode


Graphics setting view
Range, dB:




Table of measured characteristics
Frequency response Cowon D2 Plus
Channel
Left
Variation in frequency response in band from 100 Hz to 10 kHz, dB
-0,08, 0,05

Impedance of Cowon D2 Plus as AMP mode





Table of measured characteristics
Impedance Cowon D2 Plus
Channel
Left
Impedance average in band from 40 Hz to 15 kHz, ohm
2,3
Resistance at 500 Hz, ohm
1,4
Resistance at 1000 Hz, ohm
1,4
The minimum value in band from 40 Hz to 15 kHz at frequency, Hz
4145,0
The minimum value in band from 40 Hz to 15 kHz, ohm
1,2
The maximum value in band from 40 Hz to 15 kHz at frequency, Hz
40,5
The maximum value in band from 40 Hz to 15 kHz, ohm
11,4

Frequency response of Cowon D2 Plus with loaded resistors as AMP mode


Graphics setting view
Range, dB:




Table of measured characteristics
Frequency response of amplifier headphone amplifier Cowon D2 Plus
with resistive load
Channel
Left
Variation in frequency response in band 40 Hz to 15 kHz loaded 16 ohm, dB
4,04
Variation in frequency response in band 40 Hz to 15 kHz loaded 32 ohm, dB
2,32
Variation in frequency response in band 40 Hz to 15 kHz loaded 50 ohm, dB
1,57
Variation in frequency response in band 40 Hz to 15 kHz loaded 100 ohm, dB
0,83
Variation in frequency response in band 40 Hz to 15 kHz loaded 250 ohm, dB
0,35
Variation in frequency response in band 40 Hz to 15 kHz loaded 600 ohm, dB
0,15

Frequency response of Cowon D2 Plus loaded dynamic headphone type as AMP mode


Graphics setting view
Range, dB:




Table of measured characteristics
Frequency response of the headphone amplifier Cowon D2 Plus
loaded dynamic headphone type
Channel
Left
Variation in frequency response in band 40 Hz to 15 kHz load the dynamic type, dB
0,80

Deviation of frequency response of Cowon D2 Plus loaded dynamic headphone type as AMP mode


Graphics setting view
Range, dB:




Table of measured characteristics
Frequency response of amplifier Cowon D2 Plus
loaded dynamic headphone type
Channel
Left
Variation in frequency response in band 40 Hz to 15 kHz load the dynamic type, dB
0,76

Frequency response of Cowon D2 Plus loaded type balance armature headphone type (one driver) as AMP mode


Graphics setting view
Range, dB:




Table of measured characteristics
Frequency response of amplifier Cowon D2 Plus
loaded type balanced armature
Channel
Left
Variation in frequency response in band 40 Hz to 15 kHz loaded type balanced armature, dB
4,57

Deviation of frequency response of Cowon D2 Plus loaded type balance armature headphone type (one driver) as AMP mode


Graphics setting view
Range, dB:




Table of measured characteristics
Frequency response of amplifier Cowon D2 Plus
loaded type balanced armature
Channel
Left
Variation in frequency response in band 40 Hz to 15 kHz loaded type balanced armature, dB
4,58



Maximum voltage output level vs load of Cowon D2 Plus as AMP mode





Table of measured characteristics

The device was tested for a long time, a method of constructing the graph and table were outdated and not suitable for direct comparison of values between different devices. The current data are the closest to "Before hard overload" as the maximum level before clipping. The latest version of the methodology uses to build on the characters of the spectra and divided into "Pure power @ class A", "Optimal power @ class AB", "Hard power @ B class" and "Before hard overload".

Now the original data to update the graph and table no. Require re-testing of the device. Re-test will be conducted only in the presence of the device in a test lab RAA.

CloseMore detailed
Reports and testing methodology is gradually updated. We try to generate the report in such a way that it would have been a single kind of report for all devices, convenient for direct comparison.

We constantly introduce new tests and improving the options for displaying graphs and parameters. It introduces different changes in reports. Because reports are generated automatically, the updates do not take much time.

In the development and implementation of new tests, new reports are more complete. To update some charts and tables may require additional time to process the raw data separately for each device.

Some devices require re-testing.



The maximum voltage level load before overload or the certain level of distortion Cowon D2 Plus
(the values of the maximum current and voltage)
Limit
Pure
Optimal
Hard
Level
VRMS
dBV
VRMS
dBV
VRMS
dBV
loaded 16 ohm
N/А
N/А
N/А
N/А
0,59
-4,52
loaded 24 ohm
N/А
N/А
N/А
N/А
0,78
-2,17
loaded 30 ohm
N/А
N/А
N/А
N/А
0,79
-2,07
loaded 50 ohm
N/А
N/А
N/А
N/А
0,80
-1,91
loaded 100 ohm
N/А
N/А
N/А
N/А
0,81
-1,79
loaded 200 ohm
N/А
N/А
N/А
N/А
0,82
-1,73
loaded 300 ohm
N/А
N/А
N/А
N/А
0,82
-1,71
loaded 600 ohm
N/А
N/А
N/А
N/А
0,82
-1,68
loaded 750 ohm
N/А
N/А
N/А
N/А
0,82
-1,68





The maximum level of voltage from the musical power of Cowon D2 Plus as AMP mode

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Brief information


Table of measured characteristics
Recommended impedances for headphones for Cowon D2 Plus
Recommended impedance for headphones from the range
8 - 1008 Ом для режима работы усилителя
Equivalent class A F.A.Q.
Max, before clippingF.A.Q.
For In-Ear Headphones
No recommendation, Amp is too quiet
8 - 154 ohm
For Over-Ear Headphones
No recommendation, Amp is too quiet
8 - 16 ohm


Table of measured characteristics
Cowon D2 Plus
Output Impedance
1.81 ohm
Power characteristics of the
Voltage
Current
Equivalent class A F.A.Q.
0.70 VRMS
-3.11 dBV
0.13 mA
-17.67 dB(mA)
Equivalent class AB F.A.Q.
0.88 VRMS
-1.11 dBV
0.56 mA
-5.08 dB(mA)
Equivalent class B F.A.Q.
0.88 VRMS
-1.13 dBV
1.50 mA
3.50 dB(mA)
Maximum mode F.A.Q.
0.88 VRMS
-1.11 dBV
34.89 mA
30.86 dB(mA)

Maximum current level output vs load of Cowon D2 Plus as AMP mode





Table of measured characteristics

The device was tested for a long time, a method of constructing the graph and table were outdated and not suitable for direct comparison of values between different devices. The current data are the closest to "Before hard overload" as the maximum level before clipping. The latest version of the methodology uses to build on the characters of the spectra and divided into "Pure power @ class A", "Optimal power @ class AB", "Hard power @ B class" and "Before hard overload".

Now the original data to update the graph and table no. Require re-testing of the device. Re-test will be conducted only in the presence of the device in a test lab RAA.

CloseMore detailed
Reports and testing methodology is gradually updated. We try to generate the report in such a way that it would have been a single kind of report for all devices, convenient for direct comparison.

We constantly introduce new tests and improving the options for displaying graphs and parameters. It introduces different changes in reports. Because reports are generated automatically, the updates do not take much time.

In the development and implementation of new tests, new reports are more complete. To update some charts and tables may require additional time to process the raw data separately for each device.

Some devices require re-testing.



Maximum output current level vs load at overload or achive the certain level of distortion Cowon D2 Plus
(the values of the maximum current and voltage)
Limit
Pure
mA
Optimal
mA
Hard
mA
loaded 16 ohm
N/А
N/А
37,13
loaded 24 ohm
N/А
N/А
32,52
loaded 30 ohm
N/А
N/А
26,14
loaded 50 ohm
N/А
N/А
16,01
loaded 100 ohm
N/А
N/А
8,14
loaded 200 ohm
N/А
N/А
4,11
loaded 300 ohm
N/А
N/А
2,73
loaded 600 ohm
N/А
N/А
1,37
loaded 750 ohm
N/А
N/А
1,10



Maximum power level output level vs load of Cowon D2 Plus as AMP mode





Table of measured characteristics

The device was tested for a long time, a method of constructing the graph and table were outdated and not suitable for direct comparison of values between different devices. The current data are the closest to "Before hard overload" as the maximum level before clipping. The latest version of the methodology uses to build on the characters of the spectra and divided into "Pure power @ class A", "Optimal power @ class AB", "Hard power @ B class" and "Before hard overload".

Now the original data to update the graph and table no. Require re-testing of the device. Re-test will be conducted only in the presence of the device in a test lab RAA.

CloseMore detailed
Reports and testing methodology is gradually updated. We try to generate the report in such a way that it would have been a single kind of report for all devices, convenient for direct comparison.

We constantly introduce new tests and improving the options for displaying graphs and parameters. It introduces different changes in reports. Because reports are generated automatically, the updates do not take much time.

In the development and implementation of new tests, new reports are more complete. To update some charts and tables may require additional time to process the raw data separately for each device.

Some devices require re-testing.



Maximum output power level vs load at overload or achive the certain level of distortion Cowon D2 Plus
(the values of the maximum current and voltage)
Limit
Pure
Optimal
Hard
Level
mW
dBm
mW
dBm
mW
dBm
loaded 16 ohm
N/А
N/А
N/А
N/А
0,02
-33,13
loaded 24 ohm
N/А
N/А
N/А
N/А
0,03
-31,93
loaded 30 ohm
N/А
N/А
N/А
N/А
0,02
-33,73
loaded 50 ohm
N/А
N/А
N/А
N/А
0,01
-37,82
loaded 100 ohm
N/А
N/А
N/А
N/А
0,01
-43,58
loaded 200 ohm
N/А
N/А
N/А
N/А
0,00
-49,45
loaded 300 ohm
N/А
N/А
N/А
N/А
0,00
-52,99
loaded 600 ohm
N/А
N/А
N/А
N/А
0,00
-58,95
loaded 750 ohm
N/А
N/А
N/А
N/А
0,00
-60,86





THD vs load vs output voltage of Cowon D2 Plus as AMP mode


Graphics setting view
Load, ohm:




Table of measured characteristics


On-line comparison and selection services for Cowon D2 Plus

The automatic selection of the optimal AMP models from Cowon D2 Plus .
from the measured power parameters of the amplifying part and the measured parameters of the headphones for different purpose of use.


Close

Measurements of Cowon D2 Plus were carried out by Roman Kuznetsov on the hardware-software complex RAA.

The Cowon D2 Plus test was conducted as a black box test, without regard to cost and prestige. This is the basic principle for making measurements, measurement reports and developing tests in RAA.

I believe that it is important to do not make an absolute assessment of the device, but an aggregate assessment when working together with a headphones and taking into account external factors. This allows you to effectively reveal the potential of the entire set of devices or to make a more optimal choice of components.




Kuznetsov Roman
Founder of RAA



Known by the nickname romanrex
Аuthor of articles iXBT.com




Cowon D2 Plus is available in reports and services. You are in a professional report.



Information for entry level users

report for a newbie
(Headphone amplifier)

General recommendations

The automatic selection of the optimal AMP models

Information for all

Comparison of on-line graphs






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