Measurement's report Astell&Kern AK70 Balanced test and graphs - Reference Audio Analyzer

Astell&Kern AK70 is available in reports and services. You are in a professional report.

Service and suite of tests

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 / Astell&Kern / AK70 / Balanced / Amplifier path / report for a pro

Conducted technical work on updating the report. Charts may temporarily not be displayed at the time of the work.

Test report Astell&Kern AK70: Balanced (report for a pro)






Test report - general data of Astell&Kern AK70 Balanced 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
Astell&Kern AK70 Balanced
Channel
Center/Summary
Average variation in FR in the band 40 Hz to 15 kHz, dB
-0,06, 0,03
Average value of impedance band in 40 Hz to 15 kHz, ohm
9,9
Max voltage output
VRMS
dBV
Clear or equal class AF.A.Q.
1,11
0,92
Optimal or equal class ABF.A.Q.
2,22
6,91
Hard or equal class BF.A.Q.
2,22
6,91
Max, before clippingF.A.Q.
2,22
6,91
Maximum current output at loaded
ohm
mA
Clear or equal class AF.A.Q.
15,8
6,08
Optimal or equal class ABF.A.Q.
62,4
14,41
Hard or equal class BF.A.Q.
100,0
15,99
Max, before clippingF.A.Q.
100,0
20,12
Max power output
ohm
mW
dBm
Clear or equal class AF.A.Q.
300,0
3,86
5,86
Optimal or equal class ABF.A.Q.
198,9
22,41
13,50
Hard or equal class BF.A.Q.
100,0
25,58
14,08
Max, before clippingF.A.Q.
100,0
40,49
16,07

The table shows a most important technical characteristics of Astell&Kern AK70 Balanced

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



Test conditions



Frequency response of Astell&Kern AK70 Balanced as AMP mode


Graphics setting view
Range, dB:
Channel:




Table of measured characteristics
Frequency response Astell&Kern AK70 Balanced
Channel
Left
Right
Variation in frequency response in band from 100 Hz to 10 kHz, dB
-0,06, 0,03
-0,06, 0,03

Impedance of Astell&Kern AK70 Balanced as AMP mode


Graphics setting view
Channel:




Table of measured characteristics
Impedance Astell&Kern AK70 Balanced
Channel
Left
Right
Impedance average in band from 40 Hz to 15 kHz, ohm
9,9
9,9
Resistance at 500 Hz, ohm
9,9
9,9
Resistance at 1000 Hz, ohm
9,9
9,9
The minimum value in band from 40 Hz to 15 kHz at frequency, Hz
52,6
60,7
The minimum value in band from 40 Hz to 15 kHz, ohm
9,8
9,8
The maximum value in band from 40 Hz to 15 kHz at frequency, Hz
14028,9
14028,9
The maximum value in band from 40 Hz to 15 kHz, ohm
9,9
9,9

Crosstalk of Astell&Kern AK70 Balanced as AMP mode


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




Table of measured characteristics

Crosstalk Phase of Astell&Kern AK70 Balanced as AMP mode


Graphics setting view
Channel:
Load, ohm:



Frequency response of Astell&Kern AK70 Balanced with loaded resistors as AMP mode


Graphics setting view
Range, dB:
Channel:




Table of measured characteristics
Frequency response of amplifier headphone amplifier Astell&Kern AK70 Balanced
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
0,01
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
0,01
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 Astell&Kern AK70 Balanced loaded dynamic headphone type as AMP mode


Graphics setting view
Range, dB:
Channel:




Table of measured characteristics
Frequency response of the headphone amplifier Astell&Kern AK70 Balanced
loaded dynamic headphone type
Channel
Center/Summary
Variation in frequency response in band 40 Hz to 15 kHz load the dynamic type, dB
1,00

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


Deviation of frequency response of Astell&Kern AK70 Balanced loaded dynamic headphone type as AMP mode


Graphics setting view
Range, dB:
Channel:




Table of measured characteristics
Frequency response of amplifier Astell&Kern AK70 Balanced
loaded dynamic headphone type
Channel
Center/Summary
Variation in frequency response in band 40 Hz to 15 kHz load the dynamic type, dB
0,95

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


Frequency response of Astell&Kern AK70 Balanced 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 Astell&Kern AK70 Balanced
loaded type balanced armature
Channel
Center/Summary
Variation in frequency response in band 40 Hz to 15 kHz loaded type balanced armature, dB
3,58

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


Deviation of frequency response of Astell&Kern AK70 Balanced 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 Astell&Kern AK70 Balanced
loaded type balanced armature
Channel
Center/Summary
Variation in frequency response in band 40 Hz to 15 kHz loaded type balanced armature, dB
3,58

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




Maximum voltage output level vs load of Astell&Kern AK70 Balanced as AMP mode


Graphics setting view
Channel:




Table of measured characteristics
Maximum voltage output level vs load Astell&Kern AK70 Balanced (the source data for the spectra)
Limit
Clear or equal class AF.A.Q.
Optimal or equal class ABF.A.Q.
Hard or equal class BF.A.Q.
Max, before clippingF.A.Q.
Level
VRMS
dBV
VRMS
dBV
VRMS
dBV
VRMS
dBV
loaded 16 ohm
0,10
-20,36
0,19
-14,37
0,24
-12,39
0,27
-11,41
loaded 25 ohm
0,13
-17,68
0,33
-9,69
0,37
-8,70
0,37
-8,70
loaded 31 ohm
0,18
-15,10
0,35
-9,11
0,44
-7,11
0,44
-7,11
loaded 62 ohm
0,23
-12,91
0,90
-0,92
0,90
-0,92
0,90
-0,92
loaded 100 ohm
0,36
-8,91
1,43
3,08
1,60
4,08
2,01
6,07
loaded 199 ohm
0,75
-2,50
2,11
6,49
2,11
6,49
2,11
6,49
loaded 300 ohm
1,08
0,63
2,14
6,63
2,14
6,63
2,14
6,63
loaded 763 ohm
1,10
0,81
2,19
6,80
2,19
6,80
2,19
6,80
Not loaded
1,11
0,92
2,22
6,91
2,22
6,91
2,22
6,91





The maximum level of voltage from the musical power of Astell&Kern AK70 Balanced as AMP mode

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Brief information


Table of measured characteristics
Recommended impedances for headphones for Astell&Kern AK70 Balanced
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
16 - 231 ohm
8 - 973 ohm
For Over-Ear Headphones
No recommendation, Amp is too quiet
9 - 105 ohm


Table of measured characteristics
Astell&Kern AK70 Balanced
Output Impedance
9.86 ohm
Power characteristics of the
Voltage
Current
Equivalent class A F.A.Q.
1.11 VRMS
0.92 dBV
4.42 mA
12.91 dB(mA)
Equivalent class AB F.A.Q.
2.22 VRMS
6.91 dBV
13.09 mA
22.34 dB(mA)
Equivalent class B F.A.Q.
2.22 VRMS
6.91 dBV
15.01 mA
23.53 dB(mA)
Maximum mode F.A.Q.
2.22 VRMS
6.91 dBV
16.51 mA
24.35 dB(mA)

Maximum current level output vs load of Astell&Kern AK70 Balanced as AMP mode


Graphics setting view
Channel:




Table of measured characteristics
Maximum current level output vs load Astell&Kern AK70 Balanced (the source data for the spectra)
Level, mA
Clear or equal class AF.A.Q.
Optimal or equal class ABF.A.Q.
Hard or equal class BF.A.Q.
Max, before clippingF.A.Q.
Level
mA
dB(mA)
mA
dB(mA)
mA
dB(mA)
mA
dB(mA)
loaded 16 ohm
6,08
15,67
12,10
21,66
15,20
23,63
17,02
24,62
loaded 25 ohm
5,33
14,54
13,37
22,53
14,99
23,52
14,99
23,52
loaded 31 ohm
5,77
15,22
11,49
21,21
14,45
23,20
14,45
23,20
loaded 62 ohm
3,63
11,19
14,41
23,18
14,41
23,18
14,41
23,18
loaded 100 ohm
3,59
11,09
14,26
23,08
15,99
24,08
20,12
26,07
loaded 199 ohm
3,77
11,52
10,61
20,52
10,61
20,52
10,61
20,52
loaded 300 ohm
3,59
11,09
7,15
17,09
7,15
17,09
7,15
17,09
loaded 763 ohm
1,44
3,16
2,87
9,15
2,87
9,15
2,87
9,15
Not loaded
0,02
-33,06
0,04
-27,07
0,04
-27,07
0,04
-27,07



Maximum power level output level vs load of Astell&Kern AK70 Balanced as AMP mode


Graphics setting view
Channel:




Table of measured characteristics
Maximum power level output level vs load Astell&Kern AK70 Balanced (the source data for the spectra)
Limit
Clear or equal class AF.A.Q.
Optimal or equal class ABF.A.Q.
Hard or equal class BF.A.Q.
Max, before clippingF.A.Q.
Level
mW
dBm
mW
dBm
mW
dBm
mW
dBm
loaded 16 ohm
0,58
-2,34
2,31
3,64
3,65
5,62
4,58
6,61
loaded 25 ohm
0,70
-1,57
4,38
6,42
5,51
7,41
5,51
7,41
loaded 31 ohm
1,01
0,06
4,03
6,05
6,37
8,04
6,37
8,04
loaded 62 ohm
0,82
-0,86
12,96
11,13
12,96
11,13
12,96
11,13
loaded 100 ohm
1,29
1,09
20,34
13,08
25,58
14,08
40,49
16,07
loaded 199 ohm
2,83
4,51
22,41
13,50
22,41
13,50
22,41
13,50
loaded 300 ohm
3,86
5,86
15,33
11,86
15,33
11,86
15,33
11,86
loaded 763 ohm
1,58
1,98
6,28
7,98
6,28
7,98
6,28
7,98
Not loaded
0,02
-16,07
0,10
-10,08
0,10
-10,08
0,10
-10,08





THD vs load vs output voltage of Astell&Kern AK70 Balanced as AMP mode


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




Table of measured characteristics

Spectrum of Total Harmonic Distortion vs Level of Astell&Kern AK70 Balanced 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 Astell&Kern AK70 Balanced 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 Astell&Kern AK70 Balanced 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 Astell&Kern AK70 Balanced 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 Astell&Kern AK70 Balanced

The automatic selection of the optimal AMP models from Astell&Kern AK70 Balanced.
from the measured power parameters of the amplifying part and the measured parameters of the headphones for different purpose of use.






Измерения Astell&Kern AK70 Balanced проведены Романом Кузнецовым на программно-аппаратном комплексе RAA.

Тест Astell&Kern AK70 Balanced проведен как черного ящика, без учета стоимости и престижа. Это главный принцип измерений и разработки тестов в RAA.

Считаю, что важно делать не абсолютную оценку устройства, а совокупную оценку при совместной работе с наушниками и учетом внешних факторов. Это позволяет эффективно раскрывать потенциал всей связки устройств или делать более оптимальный подбор компонентов.




Kuznetsov Roman
Founder of RAA



Known by the nickname romanrex
Аuthor of articles iXBT.com




Astell&Kern AK70 is available in reports and services. You are in a professional report.

Service and suite of tests

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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