Measurement's report Xiaomi Mi A1 VLC OpenSL ES test and graphs - Reference Audio Analyzer

Reports / Xiaomi / Mi A1 / VLC OpenSL ES / Amplifier path / report for a pro

Test report Xiaomi Mi A1: VLC OpenSL ES (report for a pro)






Test report - general data of Xiaomi Mi A1 VLC OpenSL ES 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
Xiaomi Mi A1 VLC OpenSL ES
Channel
Center/Summary
Average variation in FR in the band 40 Hz to 15 kHz, dB
-0,06, 0,12
Average value of impedance band in 40 Hz to 15 kHz, ohm
1,3
Max voltage output
VRMS
dBV
Pure or equal class A
0,00
-84,13
Optimal or equal class AB
1,99
5,97
Hard or equal class B
1,99
5,97
Max, before clipping
1,99
5,97
Maximum current output at loaded
ohm
mA
Pure or equal class A
24,5
0,00
Optimal or equal class AB
30,5
31,26
Hard or equal class B
30,5
31,26
Max, before clipping
30,5
31,26
Max power output
ohm
mW
dBm
Pure or equal class A
24,5
0,00
-68,51
Optimal or equal class AB
100,0
30,59
14,86
Hard or equal class B
100,0
30,59
14,86
Max, before clipping
100,0
30,59
14,86

The table shows a most important technical characteristics of Xiaomi Mi A1 VLC OpenSL ES

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



Test conditions



Frequency response of Xiaomi Mi A1 VLC OpenSL ES as AMP mode


Graphics setting view
Range, dB:
Channel:




Table of measured characteristics
Frequency response Xiaomi Mi A1 VLC OpenSL ES
Channel
Left
Right
Variation in frequency response in band from 100 Hz to 10 kHz, dB
-0,06, 0,07
-0,06, 0,07

Impedance of Xiaomi Mi A1 VLC OpenSL ES as AMP mode


Graphics setting view
Channel:




Table of measured characteristics
Impedance Xiaomi Mi A1 VLC OpenSL ES
Channel
Left
Right
Impedance average in band from 40 Hz to 15 kHz, ohm
1,3
1,3
Resistance at 500 Hz, ohm
1,3
1,3
Resistance at 1000 Hz, ohm
1,3
1,3
The minimum value in band from 40 Hz to 15 kHz at frequency, Hz
14028,9
14028,9
The minimum value in band from 40 Hz to 15 kHz, ohm
1,3
1,3
The maximum value in band from 40 Hz to 15 kHz at frequency, Hz
1418,2
60,7
The maximum value in band from 40 Hz to 15 kHz, ohm
1,3
1,4

Crosstalk of Xiaomi Mi A1 VLC OpenSL ES as AMP mode


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




Table of measured characteristics

Crosstalk Phase of Xiaomi Mi A1 VLC OpenSL ES as AMP mode


Graphics setting view
Channel:
Load, ohm:



Frequency response of Xiaomi Mi A1 VLC OpenSL ES with loaded resistors as AMP mode


Graphics setting view
Range, dB:
Channel:




Table of measured characteristics
Frequency response of amplifier headphone amplifier Xiaomi Mi A1 VLC OpenSL ES
with resistive load
Channel
Center/Summary
Variation in frequency response in band 40 Hz to 15 kHz loaded 16 ohm, dB
0,03
Variation in frequency response in band 40 Hz to 15 kHz loaded 32 ohm, dB
0,01
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
0,00
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 Xiaomi Mi A1 VLC OpenSL ES loaded dynamic headphone type as AMP mode


Graphics setting view
Range, dB:
Channel:




Table of measured characteristics
Frequency response of the headphone amplifier Xiaomi Mi A1 VLC OpenSL ES
loaded dynamic headphone type
Channel
Center/Summary
Variation in frequency response in band 40 Hz to 15 kHz load the dynamic type, dB
0,24

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


Deviation of frequency response of Xiaomi Mi A1 VLC OpenSL ES loaded dynamic headphone type as AMP mode


Graphics setting view
Range, dB:
Channel:




Table of measured characteristics
Frequency response of amplifier Xiaomi Mi A1 VLC OpenSL ES
loaded dynamic headphone type
Channel
Center/Summary
Variation in frequency response in band 40 Hz to 15 kHz load the dynamic type, dB
0,14

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


Frequency response of Xiaomi Mi A1 VLC OpenSL ES 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 Xiaomi Mi A1 VLC OpenSL ES
loaded type balanced armature
Channel
Center/Summary
Variation in frequency response in band 40 Hz to 15 kHz loaded type balanced armature, dB
0,79

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


Deviation of frequency response of Xiaomi Mi A1 VLC OpenSL ES 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 Xiaomi Mi A1 VLC OpenSL ES
loaded type balanced armature
Channel
Center/Summary
Variation in frequency response in band 40 Hz to 15 kHz loaded type balanced armature, dB
0,61

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




Maximum voltage output level vs load of Xiaomi Mi A1 VLC OpenSL ES as AMP mode


Graphics setting view
Channel:




Table of measured characteristics
Maximum voltage output level vs load Xiaomi Mi A1 VLC OpenSL ES (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
0,00
-121,68
0,49
-6,26
0,49
-6,26
0,49
-6,26
loaded 25 ohm
0,00
-84,62
0,67
-3,52
0,67
-3,52
0,67
-3,52
loaded 31 ohm
0,00
-84,51
0,95
-0,42
0,95
-0,42
0,95
-0,42
loaded 62 ohm
0,00
-84,33
1,38
2,78
1,38
2,78
1,38
2,78
loaded 100 ohm
0,00
-84,23
1,75
4,86
1,75
4,86
1,75
4,86
loaded 199 ohm
0,00
-84,19
1,65
4,37
1,65
4,37
1,65
4,37
loaded 300 ohm
0,00
-84,16
1,98
5,93
1,98
5,93
1,98
5,93
loaded 763 ohm
0,00
-84,13
1,57
3,92
1,57
3,92
1,57
3,92
Not loaded
0,00
-84,13
1,99
5,97
1,99
5,97
1,99
5,97





The maximum level of voltage from the musical power of Xiaomi Mi A1 VLC OpenSL ES as AMP mode




Brief information


Table of measured characteristics
Recommended impedances for headphones for Xiaomi Mi A1 VLC OpenSL ES
Recommended impedance for headphones from the range
8 - 1008 Ом для режима работы усилителя
Equivalent class A
Max, before clipping
For In-Ear Headphones
No recommendation, Amp is too quiet
8 - 1007 ohm
For Over-Ear Headphones
No recommendation, Amp is too quiet
64 - 78 ohm


Table of measured characteristics
Xiaomi Mi A1 VLC OpenSL ES
Output Impedance
1.30 ohm
Power characteristics of the
Voltage
Current
Equivalent class A
0.00 VRMS
-84.13 dBV
0.00 mA
-63.28 dB(mA)
Equivalent class AB
1.99 VRMS
5.97 dBV
27.63 mA
28.83 dB(mA)
Equivalent class B
1.99 VRMS
5.97 dBV
27.63 mA
28.83 dB(mA)
Maximum mode
1.99 VRMS
5.97 dBV
27.63 mA
28.83 dB(mA)

Maximum current level output vs load of Xiaomi Mi A1 VLC OpenSL ES as AMP mode


Graphics setting view
Channel:




Table of measured characteristics
Maximum current level output vs load Xiaomi Mi A1 VLC OpenSL ES (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
0,00
-85,65
30,79
29,77
30,79
29,77
30,79
29,77
loaded 25 ohm
0,00
-52,40
27,22
28,70
27,22
28,70
27,22
28,70
loaded 31 ohm
0,00
-54,19
31,26
29,90
31,26
29,90
31,26
29,90
loaded 62 ohm
0,00
-60,23
22,08
26,88
22,08
26,88
22,08
26,88
loaded 100 ohm
0,00
-64,23
17,49
24,86
17,49
24,86
17,49
24,86
loaded 199 ohm
0,00
-70,16
8,31
18,40
8,31
18,40
8,31
18,40
loaded 300 ohm
0,00
-73,70
6,59
16,38
6,59
16,38
6,59
16,38
loaded 763 ohm
0,00
-81,78
2,06
6,27
2,06
6,27
2,06
6,27
Not loaded
0,00
-118,11
0,04
-28,00
0,04
-28,00
0,04
-28,00



Maximum power level output level vs load of Xiaomi Mi A1 VLC OpenSL ES as AMP mode


Graphics setting view
Channel:




Table of measured characteristics
Maximum power level output level vs load Xiaomi Mi A1 VLC OpenSL ES (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
0,00
-103,67
14,98
11,75
14,98
11,75
14,98
11,75
loaded 25 ohm
0,00
-68,51
18,16
12,59
18,16
12,59
18,16
12,59
loaded 31 ohm
0,00
-69,35
29,80
14,74
29,80
14,74
29,80
14,74
loaded 62 ohm
0,00
-72,28
30,43
14,83
30,43
14,83
30,43
14,83
loaded 100 ohm
0,00
-74,23
30,59
14,86
30,59
14,86
30,59
14,86
loaded 199 ohm
0,00
-77,17
13,75
11,38
13,75
11,38
13,75
11,38
loaded 300 ohm
0,00
-78,93
13,05
11,15
13,05
11,15
13,05
11,15
loaded 763 ohm
0,00
-82,96
3,23
5,10
3,23
5,10
3,23
5,10
Not loaded
0,00
-101,12
0,08
-11,02
0,08
-11,02
0,08
-11,02





THD vs load vs output voltage of Xiaomi Mi A1 VLC OpenSL ES as AMP mode


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




Table of measured characteristics

Spectrum of Total Harmonic Distortion vs Level of Xiaomi Mi A1 VLC OpenSL ES 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 Xiaomi Mi A1 VLC OpenSL ES 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 Xiaomi Mi A1 VLC OpenSL ES 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 Xiaomi Mi A1 VLC OpenSL ES 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 Xiaomi Mi A1 VLC OpenSL ES

The automatic selection of the optimal AMP models from Xiaomi Mi A1 VLC OpenSL ES.
from the measured power parameters of the amplifying part and the measured parameters of the headphones for different purpose of use.


Close

Measurements of Xiaomi Mi A1 VLC OpenSL ES were carried out by Roman Kuznetsov on the hardware-software complex RAA.

The Xiaomi Mi A1 VLC OpenSL ES 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




Xiaomi Mi A1 is available in reports and services. You are in a professional report.



Information for entry level users

reports for a newbie (Headphone amplifier)





Original text in Russian page. Translation page is not yet ready

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Comments

Commentary view:





romanrex
2019-01-05 02:06:14

Комментарий к профессиональному отчету Xiaomi Mi A1 Neutron Android 9
Хороший звук с выводом без искажений видимо окончательно остался в Android 7. Ни в восьмом, ни в девятом звука без искажений нет.
Reply


romanrex
2019-01-06 14:00:19

Комментарий к профессиональному отчету Xiaomi Mi A1 Stellio OpenSL On
У Stellio можно видеть короткую импульсную характеристику от ресемплирования. Это дает более ранний пологий завал АЧХ и соответсвенно более "мягкий" звук.
Reply


Cregl
2019-01-06 15:02:29

Комментарий к профессиональному отчету Xiaomi Mi A1 Neutron Android 9

romanrex 2019-01-05 02:06:14
Комментарий к профессиональному отчету Xiaomi Mi A1 Neutron Android 9
Хороший звук с выводом без искажений видимо окончательно остался в Android 7. Ни в восьмом, ни в девятом звука без искажений нет.


А по USB звук не испортился?
Reply


romanrex
2019-01-07 12:11:48



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