Measurement's report SMSL sAp II - Reference Audio Analyzer

Reports / SMSL / sAp II / A set of device tests as a headphone amplifier - report for a pro

Test report SMSL sAp II (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 SMSL sAp II

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 SMSL sAp II (as headphone amplifier)

Frequency response, Impedance and Frequency response with standard headphones

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Voltage levels from the load at the output of the amplifier

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Average value of impedance band in 40 Hz - 15 kHz10.1ohm
Voltage:
Pure or equal class A / Maximum or before clipping level
12.7/15.7dBV
4.3/6.1VRMS
Current:
Pure or equal class A / Maximum or before clipping level
39.2/46.5dB(mA)
91.6/210.9mA






Frequency response SMSL sAp II (as headphone amplifier)

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Graphics setting view
Channel

Range

Channel:LeftRight
Variation in frequency response in band from 40 Hz - 15 kHz -0.1, +0.0-0.1, +0.0dB


Brief information

Clicking on the graph will take you to the comparison page of different headphone models with advanced graph display settings.



Impedance SMSL sAp II (as headphone amplifier)

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Channel

Channel:LeftRight
Impedance average in band from 40 Hz - 15 kHz10.1 10.1ohm
The minimum value in band from 40 Hz - 15 kHz10.1 10.1ohm
The maximum value in band from 40 Hz - 15 kHz10.1 10.1ohm


Comparison of basic characteristics AMPs

Brief information

Clicking on the graph will take you to the comparison page of different headphone models with advanced graph display settings.



Crosstalk SMSL sAp II (as headphone amplifier)

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Channel

Range

Load

Channel:LeftRight
Crosstalk @ 1 kHz @ 15.8 ohm -63.8 -63.6dB
Crosstalk @ 1 kHz @ 24.5 ohm -67.7 -67.2dB
Crosstalk @ 1 kHz @ 30.5 ohm -68.2 -67.9dB
Crosstalk @ 1 kHz @ 62.4 ohm -73.1 -72.8dB
Crosstalk @ 1 kHz @ 100.0 ohm -74.3 -74.4dB
Crosstalk @ 1 kHz @ 198.9 ohm -80.9 -80.7dB
Crosstalk @ 1 kHz @ 300.0 ohm -82.9 -83.1dB
Crosstalk @ 1 kHz @ 763.0 ohm -88.1 -88.9dB
Crosstalk @ 1 kHz @ Not loaded-92.5 -92.4dB


Brief information

Clicking on the graph will take you to the comparison page of different headphone models with advanced graph display settings.



Crosstalk Phase SMSL sAp II (as headphone amplifier)

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Graphics setting view
Channel

Load



Brief information

Clicking on the graph will take you to the comparison page of different headphone models with advanced graph display settings.



Frequency response SMSL sAp II with resistive load

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Channel

Range

Frequency response of amplifier with resistive load @ 40 Hz - 15 kHz
Channel:LeftRight
HP 16 Ω + SMSL sAp II 0.00.0dB
HP 32 Ω + SMSL sAp II 0.00.0dB
HP 64 Ω + SMSL sAp II 0.00.0dB
HP 126 Ω + SMSL sAp II 0.00.0dB
HP 256 Ω + SMSL sAp II 0.00.0dB
HP 512 Ω + SMSL sAp II 0.00.0dB


Brief information

Clicking on the graph will take you to the comparison page of different headphone models with advanced graph display settings.



Frequency response SMSL sAp II loaded dynamic headphone type

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Channel

Range

Frequency response of amplifier loaded dynamic headphone type @ 40 Hz - 15 kHz
Channel:LeftRight
HP 10000 Ω + SMSL sAp II 0.00.0dB
Grado GH4 Limited Edition + SMSL sAp II 1.61.5dB


Brief information

Clicking on the graph will take you to the comparison page of different headphone models with advanced graph display settings.



Frequency response SMSL sAp II loaded type balance armature headphone type

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Channel

Range

Frequency response of amplifier loaded type balance armature headphone type @ 40 Hz - 15 kHz
Channel:LeftRight
HP 10000 Ω + SMSL sAp II 0.00.0dB
Campfire Audio Andromeda + SMSL sAp II 8.68.6dB
Fearless Audio S8F Freedom + SMSL sAp II 6.96.4dB


Brief information

Clicking on the graph will take you to the comparison page of different headphone models with advanced graph display settings.



THD vs load vs output voltage SMSL sAp II

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Channel

Load

Harmonic, number

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Channel

Load

Harmonic, number

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Graphics setting view
Channel

Load

Brief information

Clicking on the graph will take you to the comparison page of different headphone models with advanced graph display settings.



Maximum voltage output level vs load SMSL sAp II

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Graphics setting view
Type of chart

RAW coordinates

Power characteristics of the Voltage Current
dBVVRMSdB(mA)mA
Equivalent class A 12.74.339.291.6
Equivalent class AB 15.76.146.5210.9
Equivalent class B 15.76.146.5210.9
Maximum mode 15.76.146.5210.9


Volume Control TypeAnalog
Optimal range of volume control36.0dB


Comparison SMSL sAp II and another amplifiers by loudness (Volume Level)

Main characteristics of the SMSL sAp II

Brief information

Clicking on the graph will take you to the comparison page of different headphone models with advanced graph display settings.



Maximum voltage output level vs load SMSL sAp II

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