Measurement's report QLS Quloos QA390 Single Hi - Low - Reference Audio Analyzer

Reports / QLS / Quloos QA390 / Single Hi - Low / A set of device tests as a headphone amplifier - report for a pro

Test report QLS Quloos QA390: Single Hi - Low (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 QLS Quloos QA390 Single Hi - Low

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 QLS Quloos QA390 (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 kHz4.0ohm
Voltage:
Pure or equal class A / Maximum or before clipping level
9.6/9.6dBV
3.0/3.0VRMS
Current:
Pure or equal class A / Maximum or before clipping level
10.9/41.2dB(mA)
3.5/115.0mA






Frequency response QLS Quloos QA390 Single Hi - Low (as headphone amplifier)

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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 QLS Quloos QA390 Single Hi - Low (as headphone amplifier)

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Channel

Channel:LeftRight
Impedance average in band from 40 Hz - 15 kHz4.0 4.0ohm
The minimum value in band from 40 Hz - 15 kHz4.0 4.0ohm
The maximum value in band from 40 Hz - 15 kHz4.0 4.0ohm


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 QLS Quloos QA390 Single Hi - Low (as headphone amplifier)

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Channel

Range

Load

Channel:LeftRight
Crosstalk @ 1 kHz @ 15.8 ohm -66.9 -67.0dB
Crosstalk @ 1 kHz @ 24.5 ohm -69.4 -69.3dB
Crosstalk @ 1 kHz @ 30.5 ohm -70.5 -70.7dB
Crosstalk @ 1 kHz @ 62.4 ohm -74.9 -75.0dB
Crosstalk @ 1 kHz @ 100.0 ohm -79.1 -78.7dB
Crosstalk @ 1 kHz @ 198.9 ohm -86.3 -85.6dB
Crosstalk @ 1 kHz @ 300.0 ohm -88.2 -88.3dB
Crosstalk @ 1 kHz @ 763.0 ohm -93.9 -94.5dB
Crosstalk @ 1 kHz @ Not loaded-97.7 -96.6dB


Brief information

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



Crosstalk Phase QLS Quloos QA390 Single Hi - Low (as headphone amplifier)

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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 QLS Quloos QA390 Single Hi - Low 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 + QLS Quloos QA390 Single Hi - Low 0.00.0dB
HP 32 Ω + QLS Quloos QA390 Single Hi - Low 0.00.0dB
HP 64 Ω + QLS Quloos QA390 Single Hi - Low 0.00.0dB
HP 126 Ω + QLS Quloos QA390 Single Hi - Low 0.00.0dB
HP 256 Ω + QLS Quloos QA390 Single Hi - Low 0.00.0dB
HP 512 Ω + QLS Quloos QA390 Single Hi - Low 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 QLS Quloos QA390 Single Hi - Low 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 + QLS Quloos QA390 Single Hi - Low 0.00.0dB
Grado GH4 Limited Edition + QLS Quloos QA390 Single Hi - Low 0.70.6dB


Brief information

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



Frequency response QLS Quloos QA390 Single Hi - Low 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 + QLS Quloos QA390 Single Hi - Low 0.00.0dB
Campfire Audio Andromeda + QLS Quloos QA390 Single Hi - Low 5.25.1dB
Fearless Audio S8F Freedom + QLS Quloos QA390 Single Hi - Low 4.23.8dB


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 QLS Quloos QA390 Single Hi - Low

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Channel

Load

Harmonic, number

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Channel

Load

Harmonic, number

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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 QLS Quloos QA390 Single Hi - Low

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Type of chart

RAW coordinates

Power characteristics of the Voltage Current
dBVVRMSdB(mA)mA
Equivalent class A 9.63.010.93.5
Equivalent class AB 9.63.039.492.9
Equivalent class B