Measurement's report IBM ThinkPad X31 test and graphs - Reference Audio Analyzer
IBM ThinkPad X31
Headphone amplifierHeadphone amplifier
Headphone amplifierHeadphone amplifier
DAC Line OutDAC Line Out



Manufacturers / IBM

Test report IBM ThinkPad X31 (report for a pro)



About this report
This is a report for professionals with a suite of test of headphone amplifier.

You can see a simple report for "dummies" with explanations of the main characteristics for IBM ThinkPad X31

One product can have multiple reports in different modes and with different a suite of tests.

A suite of tests for a headphone amplifier can be applied to just a universal output without a formal presence of an amplifier, if in this mode you can connect headphones to this output. Based on the results of the tests, you can understand the real picture, is the output powerful enough or not, with the initial data on the circuitry as a "black box".



Test report - general data of IBM ThinkPad X31 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

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General results
General results
IBM ThinkPad X31
Channel
Center/Summary
Average variation in FR in the band 40 Hz to 15 kHz, dB
-0,06, 0,08
Average value of impedance band in 40 Hz to 15 kHz, ohm
70,0
Max voltage output
VRMS
dBV
Clear or equal class AF.A.Q.
0,25
-12,08
Optimal or equal class ABF.A.Q.
0,25
-12,08
Hard or equal class BF.A.Q.
0,25
-12,08
Max, before clippingF.A.Q.
0,25
-12,08
Maximum current output at loaded
ohm
mA
Clear or equal class AF.A.Q.
30,5
0,22
Optimal or equal class ABF.A.Q.
300,0
0,54
Hard or equal class BF.A.Q.
62,4
0,95
Max, before clippingF.A.Q.
15,8
2,92
Max power output
ohm
mW
dBm
Clear or equal class AF.A.Q.
300,0
0,01
-20,62
Optimal or equal class ABF.A.Q.
300,0
0,09
-10,63
Hard or equal class BF.A.Q.
198,9
0,17
-7,69
Max, before clippingF.A.Q.
62,4
0,22
-6,52

The table shows a most important technical characteristics of IBM ThinkPad X31

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



Test conditions


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Frequency response of IBM ThinkPad X31 as AMP mode


Graphics setting view
Range, dB:
Channel:


Brief information
Translation of the description is not yet ready

Original text in Russian report. You can help with translation via the forum or feedback.


Table
Frequency response IBM ThinkPad X31
Channel
Left
Right
Variation in frequency response in band from 100 Hz to 10 kHz, dB
-0,06, 0,07
-0,05, 0,07

Impedance of IBM ThinkPad X31 as AMP mode


Graphics setting view
Channel:


Brief information
Translation of the description is not yet ready

Original text in Russian report. You can help with translation via the forum or feedback.


Table
Impedance IBM ThinkPad X31
Channel
Left
Right
Impedance average in band from 40 Hz to 15 kHz, ohm
71,8
68,2
Resistance at 500 Hz, ohm
71,0
67,4
Resistance at 1000 Hz, ohm
70,8
67,3
The minimum value in band from 40 Hz to 15 kHz at frequency, Hz
7910,5
7910,5
The minimum value in band from 40 Hz to 15 kHz, ohm
70,7
67,2
The maximum value in band from 40 Hz to 15 kHz at frequency, Hz
45,6
45,6
The maximum value in band from 40 Hz to 15 kHz, ohm
80,1
75,7


Comparison of the parameters by on-line services

Comparison of basic characteristics the

Impedance.
Voltage, Current and Impedance

Crosstalk of IBM ThinkPad X31 as AMP mode


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


Brief information
Translation of the description is not yet ready

Original text in Russian report. You can help with translation via the forum or feedback.


Table

Crosstalk Phase of IBM ThinkPad X31 as AMP mode


Graphics setting view
Channel:
Load, ohm:


Brief information
Translation of the description is not yet ready

Original text in Russian report. You can help with translation via the forum or feedback.

Frequency response of IBM ThinkPad X31 with loaded resistors as AMP mode


Graphics setting view
Range, dB:
Channel:


Brief information
Translation of the description is not yet ready

Original text in Russian report. You can help with translation via the forum or feedback.


Table
Frequency response of amplifier headphone amplifier IBM ThinkPad X31
with resistive load
Channel
Center/Summary
Variation in frequency response in band 40 Hz to 15 kHz loaded 16 ohm, dB
0,87
Variation in frequency response in band 40 Hz to 15 kHz loaded 32 ohm, dB
0,74
Variation in frequency response in band 40 Hz to 15 kHz loaded 50 ohm, dB
0,63
Variation in frequency response in band 40 Hz to 15 kHz loaded 100 ohm, dB
0,45
Variation in frequency response in band 40 Hz to 15 kHz loaded 250 ohm, dB
0,24
Variation in frequency response in band 40 Hz to 15 kHz loaded 600 ohm, dB
0,12

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



Comparison of the parameters by on-line services

Compare the frequency response of a bundle of headphones and amplifiers

How the frequency response of IBM ThinkPad X31 changes when connected to different headphones? In the example the IBM ThinkPad X31 and headphones Sennheiser CX 5.00, Sunrise Dragon Default, Audio-Technica ATH-E40, Apple EarPods, Enigma Acoustics & Lotoo Dharma D200, Kennerton Thror, OPPO PM1, Audeze LCD-XC ). You can choose and compare bundles with other headphones .

Frequency response of IBM ThinkPad X31 loaded dynamic headphone type as AMP mode


Graphics setting view
Range, dB:
Channel:


Brief information
Translation of the description is not yet ready

Original text in Russian report. You can help with translation via the forum or feedback.


Table
Frequency response of the headphone amplifier IBM ThinkPad X31
loaded dynamic headphone type
Channel
Center/Summary
Variation in frequency response in band 40 Hz to 15 kHz load the dynamic type, dB
4,38

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



Comparison of the parameters by on-line services

Compare the frequency response of a bundle of headphones and amplifiers

How the frequency response of IBM ThinkPad X31 changes when connected to different headphones? In the example the IBM ThinkPad X31 and headphones Grado eGrado, VE Monk Plus, Jays v-Jays Small, Tecsun Wood Headphones, Denon AH-MM400, Audio-Technica ATH-M50x, ASTRO Gaming A40, Sony MDR-XB950, Sennheiser HD 558, Grado GS2000e, Kennerton Vali ). You can choose and compare bundles with other headphones .

Deviation of frequency response of IBM ThinkPad X31 loaded dynamic headphone type as AMP mode


Graphics setting view
Range, dB:
Channel:


Brief information
Translation of the description is not yet ready

Original text in Russian report. You can help with translation via the forum or feedback.


Table
Frequency response of amplifier IBM ThinkPad X31
loaded dynamic headphone type
Channel
Center/Summary
Variation in frequency response in band 40 Hz to 15 kHz load the dynamic type, dB
4,34

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



Comparison of the parameters by on-line services

Compare the frequency response of a bundle of headphones and amplifiers

How the frequency response of IBM ThinkPad X31 changes when connected to different headphones? In the example the IBM ThinkPad X31 and headphones Grado eGrado, VE Monk Plus, Jays v-Jays Small, Tecsun Wood Headphones, Denon AH-MM400, Audio-Technica ATH-M50x, ASTRO Gaming A40, Sony MDR-XB950, Sennheiser HD 558, Grado GS2000e, Kennerton Vali ). You can choose and compare bundles with other headphones .

Frequency response of IBM ThinkPad X31 loaded type balance armature headphone type (one driver) as AMP mode


Graphics setting view
Range, dB:
Channel:


Brief information
Translation of the description is not yet ready

Original text in Russian report. You can help with translation via the forum or feedback.


Table
Frequency response of amplifier IBM ThinkPad X31
loaded type balanced armature
Channel
Center/Summary
Variation in frequency response in band 40 Hz to 15 kHz loaded type balanced armature, dB
12,36

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



Comparison of the parameters by on-line services

Compare the frequency response of a bundle of headphones and amplifiers

How the frequency response of IBM ThinkPad X31 changes when connected to different headphones? In the example the IBM ThinkPad X31 and headphones Sony XBA-Z5, Creative In-Ear 3, Phiaton PS 320, Dunu DN-2002, iBasso IT03, Dunu DN 900, Oriolus Mellianus, Pioneer SE 700, Bose On-ear headphones, Creative Aurvana Platinum, AKG K 340 ED ). You can choose and compare bundles with other headphones .

Deviation of frequency response of IBM ThinkPad X31 loaded type balance armature headphone type (one driver) as AMP mode


Graphics setting view
Range, dB:
Channel:


Brief information
Translation of the description is not yet ready

Original text in Russian report. You can help with translation via the forum or feedback.


Table
Frequency response of amplifier IBM ThinkPad X31
loaded type balanced armature
Channel
Center/Summary
Variation in frequency response in band 40 Hz to 15 kHz loaded type balanced armature, dB
11,92

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



Comparison of the parameters by on-line services

Compare the frequency response of a bundle of headphones and amplifiers

How the frequency response of IBM ThinkPad X31 changes when connected to different headphones? In the example the IBM ThinkPad X31 and headphones Sony XBA-Z5, Creative In-Ear 3, Phiaton PS 320, Dunu DN-2002, iBasso IT03, Dunu DN 900, Oriolus Mellianus, Pioneer SE 700, Bose On-ear headphones, Creative Aurvana Platinum, AKG K 340 ED ). You can choose and compare bundles with other headphones .



Maximum voltage output level vs load of IBM ThinkPad X31 as AMP mode


Graphics setting view
Channel:


Brief information
Translation of the description is not yet ready

Original text in Russian report. You can help with translation via the forum or feedback.


Table
Maximum voltage output level vs load IBM ThinkPad X31 (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
0,00
-51,71
0,01
-41,72
0,01
-38,72
0,05
-26,73
loaded 25 ohm
0,00
-48,85
0,01
-38,86
0,02
-32,85
0,06
-23,87
loaded 31 ohm
0,01
-43,59
0,01
-37,59
0,03
-31,59
0,07
-22,60
loaded 62 ohm
0,01
-39,55
0,03
-30,55
0,06
-24,55
0,12
-18,57
loaded 100 ohm
0,02
-34,65
0,05
-25,65
0,09
-20,65
0,15
-16,67
loaded 199 ohm
0,03
-29,69
0,10
-19,69
0,18
-14,71
0,18
-14,71
loaded 300 ohm
0,05
-25,85
0,16
-15,86
0,20
-13,87
0,20
-13,87
loaded 763 ohm
0,08
-21,83
0,23
-12,85
0,23
-12,85
0,23
-12,85
Not loaded
0,25
-12,08
0,25
-12,08
0,25
-12,08
0,25
-12,08




Comparison of the parameters by on-line services

Comparison of the power characteristics of the

Comparison of the power characteristics of the IBM ThinkPad X31.



Comparison of the power characteristics of the

Comparison the IBM ThinkPad X31 and another amplifiers by loudness (Volume Level).


Comparison of basic characteristics the

Operating mode of the amplifiers (equivalent class F.A.Q.): Voltage.
Voltage, Current and Impedance



The maximum level of voltage from the musical power of IBM ThinkPad X31 as AMP mode

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Brief information


Table
Recommended impedances for headphones for IBM ThinkPad X31
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
No recommendation, Amp is too quiet
For Over-Ear Headphones
No recommendation, Amp is too quiet
No recommendation, Amp is too quiet


Table
IBM ThinkPad X31
Output Impedance
69.99 ohm
Power characteristics of the
Voltage
Current
Equivalent class A F.A.Q.
0.25 VRMS
-12.08 dBV
0.17 mA
-15.39 dB(mA)
Equivalent class AB F.A.Q.
0.25 VRMS
-12.08 dBV
0.49 mA
-6.25 dB(mA)
Equivalent class B F.A.Q.
0.25 VRMS
-12.08 dBV
0.87 mA
-1.19 dB(mA)
Maximum mode F.A.Q.
0.25 VRMS
-12.08 dBV
2.89 mA
9.21 dB(mA)


Comparison of the parameters by on-line services

Comparison of the power characteristics of the

Comparison of the power characteristics of the and interaction headphones IBM ThinkPad X31: Enigma Acoustics & Lotoo Dharma D200, Sennheiser CX 5.00, Sunrise Dragon Default, Audio-Technica ATH-E40, Apple EarPods, Grado eGrado, VE Monk Plus, Jays v-Jays Small, Oriolus MK2, Sony XBA-Z5, Creative In-Ear 3, Phiaton PS 320, Dunu DN-2002, Dunu DN 900, Kennerton Odin, OPPO PM1, Audeze LCD-XC, Tecsun Wood Headphones, Denon AH-MM400, Audio-Technica ATH-M50x, ASTRO Gaming A40, Sony MDR-XB950, Sennheiser HD 558, Grado GS2000e, Kennerton Vali, Pioneer SE 700, Bose On-ear headphones, Creative Aurvana Platinum, AKG K 340 ED.

Comparison of volume gain AMPs

Comparison the IBM ThinkPad X31 and another amplifiers by loudness (Volume Level).

Maximum current level output vs load of IBM ThinkPad X31 as AMP mode


Graphics setting view
Channel:


Brief information
Translation of the description is not yet ready

Original text in Russian report. You can help with translation via the forum or feedback.


Table
Maximum current level output vs load IBM ThinkPad X31 (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
0,16
-15,69
0,52
-5,69
0,73
-2,69
2,92
9,30
loaded 25 ohm
0,15
-16,64
0,47
-6,64
0,93
-0,63
2,61
8,35
loaded 31 ohm
0,22
-13,27
0,43
-7,27
0,86
-1,27
2,43
7,71
loaded 62 ohm
0,17
-15,45
0,48
-6,46
0,95
-0,46
1,89
5,52
loaded 100 ohm
0,19
-14,65
0,52
-5,65
0,93
-0,65
1,47
3,33
loaded 199 ohm
0,16
-15,66
0,52
-5,66
0,92
-0,68
0,92
-0,68
loaded 300 ohm
0,17
-15,39
0,54
-5,40
0,67
-3,42
0,67
-3,42
loaded 763 ohm
0,11
-19,48
0,30
-10,50
0,30
-10,50
0,30
-10,50
Not loaded
0,00
-46,06
0,00
-46,06
0,00
-46,06
0,00
-46,06




Comparison of the parameters by on-line services

Comparison of basic characteristics the

Operating mode of the amplifiers (equivalent class F.A.Q.): Current.
Voltage, Current and Impedance

Maximum power level output level vs load of IBM ThinkPad X31 as AMP mode


Graphics setting view
Channel:


Brief information
Translation of the description is not yet ready

Original text in Russian report. You can help with translation via the forum or feedback.


Table
Maximum power level output level vs load IBM ThinkPad X31 (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
0,00
-33,70
0,00
-23,70
0,01
-20,70
0,13
-8,72
loaded 25 ohm
0,00
-32,75
0,01
-22,75
0,02
-16,74
0,17
-7,76
loaded 31 ohm
0,00
-28,43
0,01
-22,43
0,02
-16,43
0,18
-7,45
loaded 62 ohm
0,00
-27,50
0,01
-18,51
0,06
-12,50
0,22
-6,52
loaded 100 ohm
0,00
-24,65
0,03
-15,65
0,09
-10,65
0,22
-6,67
loaded 199 ohm
0,01
-22,67
0,05
-12,67
0,17
-7,69
0,17
-7,69
loaded 300 ohm
0,01
-20,62
0,09
-10,63
0,14
-8,64
0,14
-8,64
loaded 763 ohm
0,01
-20,65
0,07
-11,68
0,07
-11,68
0,07
-11,68
Not loaded
0,00
-29,07
0,00
-29,07
0,00
-29,07
0,00
-29,07





THD vs load vs output voltage of IBM ThinkPad X31 as AMP mode


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


Brief information
Full translation of the description is not yet ready

Original text in Russian report. You can help with translation via the forum or feedback.


Table

Spectrum of Total Harmonic Distortion vs Level of IBM ThinkPad X31 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:


Brief information
Full translation of the description is not yet ready

Original text in Russian report. You can help with translation via the forum or feedback.

Spectrum of IMD SMPTE vs Level of IBM ThinkPad X31 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:


Brief information
Translation of the description is not yet ready

Original text in Russian report. You can help with translation via the forum or feedback.

Spectrum of IMD CCIF vs Level of IBM ThinkPad X31 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:


Brief information
Translation of the description is not yet ready

Original text in Russian report. You can help with translation via the forum or feedback.

Spectrum of Multitone Distortion vs Level vs Load of IBM ThinkPad X31 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:


Brief information
Translation of the description is not yet ready

Original text in Russian report. You can help with translation via the forum or feedback.


On-line comparison and selection services for IBM ThinkPad X31

The automatic selection of the optimal AMP models from IBM ThinkPad X31 .
from the measured power parameters of the amplifying part and the measured parameters of the headphones for different purpose of use.



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