Measurement's report Weiliang Audio U9 test and graphs - Reference Audio Analyzer

Weiliang Audio U9 is available in reports and services. You are in a professional report.



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Test report Weiliang Audio U9 (report for a pro)






Test report - general data of Weiliang Audio U9 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
Weiliang Audio U9
Channel
Center/Summary
Average variation in FR in the band 40 Hz to 15 kHz, dB
-0,06, 0,05
Average value of impedance band in 40 Hz to 15 kHz, ohm
12,2
Max voltage output
VRMS
dBV
Pure or equal class A
4,99
13,95
Optimal or equal class AB
4,99
13,95
Hard or equal class B
4,99
13,95
Max, before clipping
4,99
13,95
Maximum current output at loaded
ohm
mA
Pure or equal class A
62,4
25,04
Optimal or equal class AB
24,5
31,47
Hard or equal class B
24,5
31,47
Max, before clipping
62,4
35,05
Max power output
ohm
mW
dBm
Pure or equal class A
198,9
110,82
20,45
Optimal or equal class AB
198,9
110,82
20,45
Hard or equal class B
198,9
110,82
20,45
Max, before clipping
100,0
122,43
20,88

The table shows a most important technical characteristics of Weiliang Audio U9

*Center channel is received by data averaging between the left and right channels



Test conditions



Frequency response of Weiliang Audio U9 as AMP mode


Graphics setting view
Range, dB:
Channel:




Table of measured characteristics
Frequency response Weiliang Audio U9
Channel
Left
Right
Variation in frequency response in band from 100 Hz to 10 kHz, dB
-0,06, 0,04
-0,06, 0,04

Impedance of Weiliang Audio U9 as AMP mode


Graphics setting view
Channel:




Table of measured characteristics
Impedance Weiliang Audio U9
Channel
Left
Right
Impedance average in band from 40 Hz to 15 kHz, ohm
12,1
12,2
Resistance at 500 Hz, ohm
12,1
12,2
Resistance at 1000 Hz, ohm
12,1
12,2
The minimum value in band from 40 Hz to 15 kHz at frequency, Hz
45,6
45,6
The minimum value in band from 40 Hz to 15 kHz, ohm
12,1
12,1
The maximum value in band from 40 Hz to 15 kHz at frequency, Hz
7910,5
7910,5
The maximum value in band from 40 Hz to 15 kHz, ohm
12,1
12,2

Crosstalk of Weiliang Audio U9 as AMP mode


Graphics setting view
Range, dB:
Channel:
Load, ohm:




Table of measured characteristics

Crosstalk Phase of Weiliang Audio U9 as AMP mode


Graphics setting view
Channel:
Load, ohm:



Frequency response of Weiliang Audio U9 with loaded resistors as AMP mode


Graphics setting view
Range, dB:
Channel:




Table of measured characteristics
Frequency response of amplifier headphone amplifier Weiliang Audio U9
with resistive load
Channel
Center/Summary
Variation in frequency response in band 40 Hz to 15 kHz loaded 16 ohm, dB
0,02
Variation in frequency response in band 40 Hz to 15 kHz loaded 32 ohm, dB
0,02
Variation in frequency response in band 40 Hz to 15 kHz loaded 50 ohm, dB
0,01
Variation in frequency response in band 40 Hz to 15 kHz loaded 100 ohm, dB
0,01
Variation in frequency response in band 40 Hz to 15 kHz loaded 250 ohm, dB
0,00
Variation in frequency response in band 40 Hz to 15 kHz loaded 600 ohm, dB
0,00

*Center channel is received by data averaging between the left and right channels


Frequency response of Weiliang Audio U9 loaded dynamic headphone type as AMP mode


Graphics setting view
Range, dB:
Channel:




Table of measured characteristics
Frequency response of the headphone amplifier Weiliang Audio U9
loaded dynamic headphone type
Channel
Center/Summary
Variation in frequency response in band 40 Hz to 15 kHz load the dynamic type, dB
1,19

*Center channel is received by data averaging between the left and right channels


Deviation of frequency response of Weiliang Audio U9 loaded dynamic headphone type as AMP mode


Graphics setting view
Range, dB:
Channel:




Table of measured characteristics
Frequency response of amplifier Weiliang Audio U9
loaded dynamic headphone type
Channel
Center/Summary
Variation in frequency response in band 40 Hz to 15 kHz load the dynamic type, dB
1,15

*Center channel is received by data averaging between the left and right channels


Frequency response of Weiliang Audio U9 loaded type balance armature headphone type (one driver) as AMP mode


Graphics setting view
Range, dB:
Channel:




Table of measured characteristics
Frequency response of amplifier Weiliang Audio U9
loaded type balanced armature
Channel
Center/Summary
Variation in frequency response in band 40 Hz to 15 kHz loaded type balanced armature, dB
4,30

*Center channel is received by data averaging between the left and right channels


Deviation of frequency response of Weiliang Audio U9 loaded type balance armature headphone type (one driver) as AMP mode


Graphics setting view
Range, dB:
Channel:




Table of measured characteristics
Frequency response of amplifier Weiliang Audio U9
loaded type balanced armature
Channel
Center/Summary
Variation in frequency response in band 40 Hz to 15 kHz loaded type balanced armature, dB
4,17

*Center channel is received by data averaging between the left and right channels




Maximum voltage output level vs load of Weiliang Audio U9 as AMP mode


Graphics setting view
Channel:




Table of measured characteristics
Maximum voltage output level vs load Weiliang Audio U9 (the source data for the spectra)
Limit
Pure or equal class A
Optimal or equal class AB
Hard or equal class B
Max, before clipping
Level
VRMS
dBV
VRMS
dBV
VRMS
dBV
VRMS
dBV
loaded 16 ohm
0,30
-10,55
0,37
-8,57
0,37
-8,57
0,42
-7,59
loaded 25 ohm
0,55
-5,17
0,77
-2,26
0,77
-2,26
0,86
-1,35
loaded 31 ohm
0,59
-4,51
0,94
-0,58
0,94
-0,58
1,04
0,36
loaded 62 ohm
1,56
3,88
1,96
5,84
1,96
5,84
2,19
6,80
loaded 100 ohm
2,22
6,94
3,13
9,91
3,13
9,91
3,50
10,88
loaded 199 ohm
4,69
13,43
4,69
13,43
4,69
13,43
4,69
13,43
loaded 300 ohm
4,79
13,60
4,79
13,60
4,79
13,60
4,79
13,60
loaded 763 ohm
4,91
13,82
4,91
13,82
4,91
13,82
4,91
13,82
Not loaded
4,99
13,95
4,99
13,95
4,99
13,95
4,99
13,95





The maximum level of voltage from the musical power of Weiliang Audio U9 as AMP mode




Brief information


Table of measured characteristics
Recommended impedances for headphones for Weiliang Audio U9
Recommended impedance for headphones from the range
8 - 1008 Ом для режима работы усилителя
Equivalent class A
Max, before clipping
For In-Ear Headphones
8 - 1007 ohm
8 - 1007 ohm
For Over-Ear Headphones
104 - 482 ohm
44 - 482 ohm


Table of measured characteristics
Weiliang Audio U9
Output Impedance
12.16 ohm
Power characteristics of the
Voltage
Current
Equivalent class A
4.99 VRMS
13.95 dBV
21.59 mA
26.69 dB(mA)
Equivalent class AB
4.99 VRMS
13.95 dBV
29.64 mA
29.44 dB(mA)
Equivalent class B
4.99 VRMS
13.95 dBV
29.64 mA
29.44 dB(mA)
Maximum mode
4.99 VRMS
13.95 dBV
33.05 mA
30.38 dB(mA)

Maximum current level output vs load of Weiliang Audio U9 as AMP mode


Graphics setting view
Channel:




Table of measured characteristics
Maximum current level output vs load Weiliang Audio U9 (the source data for the spectra)
Level, mA
Pure or equal class A
Optimal or equal class AB
Hard or equal class B
Max, before clipping
Level
mA
dB(mA)
mA
dB(mA)
mA
dB(mA)
mA
dB(mA)
loaded 16 ohm
18,79
25,48
23,59
27,46
23,59
27,46
26,41
28,44
loaded 25 ohm
22,50
27,04
31,47
29,96
31,47
29,96
34,93
30,86
loaded 31 ohm
19,50
25,80
30,69
29,74
30,69
29,74
34,18
30,67
loaded 62 ohm
25,04
27,97
31,41
29,94
31,41
29,94
35,05
30,89
loaded 100 ohm
22,23
26,94
31,31
29,91
31,31
29,91
34,99
30,88
loaded 199 ohm
23,60
27,46
23,60
27,46
23,60
27,46
23,60
27,46
loaded 300 ohm
15,96
24,06
15,96
24,06
15,96
24,06
15,96
24,06
loaded 763 ohm
6,43
16,17
6,43
16,17
6,43
16,17
6,43
16,17
Not loaded
0,10
-20,02
0,10
-20,02
0,10
-20,02
0,10
-20,02



Maximum power level output level vs load of Weiliang Audio U9 as AMP mode


Graphics setting view
Channel:




Table of measured characteristics
Maximum power level output level vs load Weiliang Audio U9 (the source data for the spectra)
Limit
Pure or equal class A
Optimal or equal class AB
Hard or equal class B
Max, before clipping
Level
mW
dBm
mW
dBm
mW
dBm
mW
dBm
loaded 16 ohm
5,58
7,46
8,79
9,44
8,79
9,44
11,02
10,42
loaded 25 ohm
12,40
10,93
24,27
13,85
24,27
13,85
29,90
14,76
loaded 31 ohm
11,60
10,64
28,72
14,58
28,72
14,58
35,63
15,52
loaded 62 ohm
39,11
15,92
61,55
17,89
61,55
17,89
76,66
18,85
loaded 100 ohm
49,41
16,94
98,00
19,91
98,00
19,91
122,43
20,88
loaded 199 ohm
110,82
20,45
110,82
20,45
110,82
20,45
110,82
20,45
loaded 300 ohm
76,41
18,83
76,41
18,83
76,41
18,83
76,41
18,83
loaded 763 ohm
31,56
14,99
31,56
14,99
31,56
14,99
31,56
14,99
Not loaded
0,50
-3,03
0,50
-3,03
0,50
-3,03
0,50
-3,03





THD vs load vs output voltage of Weiliang Audio U9 as AMP mode


Graphics setting view
Channel:
Load, ohm:
Type test:




Table of measured characteristics

Spectrum of Total Harmonic Distortion vs Level of Weiliang Audio U9 as AMP mode

Not loaded


Graphics setting view
Channel:
Level, dBV:

Loaded 15,8 ohm


Graphics setting view
Channel:
Level, dBV/dBm:

Loaded 24,5 ohm


Graphics setting view
Channel:
Level, dBV/dBm:

Loaded 30,5 ohm


Graphics setting view
Channel:
Level, dBV/dBm:

Loaded 62,4 ohm


Graphics setting view
Channel:
Level, dBV/dBm:

Loaded 100 ohm


Graphics setting view
Channel:
Level, dBV/dBm:

Loaded 198,9 ohm


Graphics setting view
Channel:
Level, dBV/dBm:

Loaded 300 ohm


Graphics setting view
Channel:
Level, dBV/dBm:

Loaded 763 ohm


Graphics setting view
Channel:
Level, dBV/dBm:



Spectrum of IMD SMPTE vs Level of Weiliang Audio U9 as AMP mode

Not loaded


Graphics setting view
Frequency band, Hz:
Channel:
Level, dBV:

Loaded 15,8 ohm


Graphics setting view
Frequency band, Hz:
Channel:
Level, dBV/dBm:

Loaded 24,5 ohm


Graphics setting view
Frequency band, Hz:
Channel:
Level, dBV/dBm:

Loaded 30,5 ohm


Graphics setting view
Frequency band, Hz:
Channel:
Level, dBV/dBm:

Loaded 62,4 ohm


Graphics setting view
Frequency band, Hz:
Channel:
Level, dBV/dBm:

Loaded 100 ohm


Graphics setting view
Frequency band, Hz:
Channel:
Level, dBV/dBm:

Loaded 198,9 ohm


Graphics setting view
Frequency band, Hz:
Channel:
Level, dBV/dBm:

Loaded 300 ohm


Graphics setting view
Frequency band, Hz:
Channel:
Level, dBV/dBm:

Loaded 763 ohm


Graphics setting view
Frequency band, Hz:
Channel:
Level, dBV/dBm:



Spectrum of IMD CCIF vs Level of Weiliang Audio U9 as AMP mode

Not loaded


Graphics setting view
Channel:
Level, dBV:

Loaded 15,8 ohm


Graphics setting view
Channel:
Level, dBV/dBm:

Loaded 24,5 ohm


Graphics setting view
Channel:
Level, dBV/dBm:

Loaded 30,5 ohm


Graphics setting view
Channel:
Level, dBV/dBm:

Loaded 62,4 ohm


Graphics setting view
Channel:
Level, dBV/dBm:

Loaded 100 ohm


Graphics setting view
Channel:
Level, dBV/dBm:

Loaded 198,9 ohm


Graphics setting view
Channel:
Level, dBV/dBm:

Loaded 300 ohm


Graphics setting view
Channel:
Level, dBV/dBm:

Loaded 763 ohm


Graphics setting view
Channel:
Level, dBV/dBm:



Spectrum of Multitone Distortion vs Level vs Load of Weiliang Audio U9 as AMP mode

Not loaded


Graphics setting view
Channel:
Level, dBV:

Loaded 15,8 ohm


Graphics setting view
Channel:
Level, dBV/dBm:

Loaded 24,5 ohm


Graphics setting view
Channel:
Level, dBV/dBm:

Loaded 30,5 ohm


Graphics setting view
Channel:
Level, dBV/dBm:

Loaded 62,4 ohm


Graphics setting view
Channel:
Level, dBV/dBm:

Loaded 100 ohm


Graphics setting view
Channel:
Level, dBV/dBm:

Loaded 198,9 ohm


Graphics setting view
Channel:
Level, dBV/dBm:

Loaded 300 ohm


Graphics setting view
Channel:
Level, dBV/dBm:

Loaded 763 ohm


Graphics setting view
Channel:
Level, dBV/dBm:




On-line comparison and selection services for Weiliang Audio U9

The automatic selection of the optimal AMP models from Weiliang Audio U9 .
from the measured power parameters of the amplifying part and the measured parameters of the headphones for different purpose of use.


Close

Measurements of Weiliang Audio U9 were carried out by Roman Kuznetsov on the hardware-software complex RAA.

The Weiliang Audio U9 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




Weiliang Audio U9 is available in reports and services. You are in a professional report.



Information for entry level users

reports for a newbie (Headphone amplifier)





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