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 xDuoo XD-05 Plus Mid Boost On

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".

Line-out, differences from the output for headphones and speakers

Advantages and disadvantages of balanced amplifiers

Test report - general data xDuoo XD-05 Plus (as headphone amplifier)

Frequency response, Impedance and Frequency response with standard headphones

Voltage levels from the load at the output of the amplifier

The main parameters of the universal block diagram of the amplifier
Average value of impedance band in 40 Hz - 15 kHz	2.3	ohm
Voltage: Linear Mode / Maximum or before clipping level	12.1/12.1	dBV
	4.0/4.0	V_RMS
Current: Linear Mode / Maximum or before clipping level	19.1/44.0	dB(mA)
	9.0/158.2	mA

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Frequency response xDuoo XD-05 Plus Mid Boost On (as headphone amplifier)

Graphics setting view

Channel

Range

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

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On the frequency response comparison page, there is an export option and additional tools for adjusting the frequency response

Impedance xDuoo XD-05 Plus Mid Boost On (as headphone amplifier)

Graphics setting view

Channel

Channel:	Left	Right
Impedance average in band from 40 Hz - 15 kHz	2.3	2.3	ohm
The minimum value in band from 40 Hz - 15 kHz	2.3	2.3	ohm
The maximum value in band from 40 Hz - 15 kHz	2.3	2.3	ohm

Comparison of basic characteristics AMPs

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Crosstalk xDuoo XD-05 Plus Mid Boost On (as headphone amplifier)

Graphics setting view

Channel

Range

Load

Channel:	Left	Right
Crosstalk @ 1 kHz @ 15.8 ohm	-68.4	-63.8	dB
Crosstalk @ 1 kHz @ 24.5 ohm	-71.6	-67.3	dB
Crosstalk @ 1 kHz @ 30.5 ohm	-73.7	-69.2	dB
Crosstalk @ 1 kHz @ 62.4 ohm	-79.7	-75.4	dB
Crosstalk @ 1 kHz @ 100.0 ohm	-82.4	-79.3	dB
Crosstalk @ 1 kHz @ 198.9 ohm	-84.3	-85.0	dB
Crosstalk @ 1 kHz @ 300.0 ohm	-84.3	-88.8	dB
Crosstalk @ 1 kHz @ 763.0 ohm	-85.2	-99.0	dB
Crosstalk @ 1 kHz @ Not loaded	-84.3	-97.9	dB

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Crosstalk Phase xDuoo XD-05 Plus Mid Boost On (as headphone amplifier)

Graphics setting view

Channel

Load

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Frequency response xDuoo XD-05 Plus Mid Boost On with resistive load

Graphics setting view

Channel

Range

Frequency response of amplifier with resistive load @ 40 Hz - 15 kHz

Channel:	Left	Right
TEST 16 ? + xDuoo XD-05 Plus Mid Boost On	0.0	0.0	dB
TEST 32 ? + xDuoo XD-05 Plus Mid Boost On	0.0	0.0	dB
TEST 64 ? + xDuoo XD-05 Plus Mid Boost On	0.0	0.0	dB
TEST 126 ? + xDuoo XD-05 Plus Mid Boost On	0.0	0.0	dB
TEST 256 ? + xDuoo XD-05 Plus Mid Boost On	0.0	0.0	dB
TEST 512 ? + xDuoo XD-05 Plus Mid Boost On	0.0	0.0	dB

Brief information

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

On the frequency response comparison page, there is an export option and additional tools for adjusting the frequency response

Frequency response xDuoo XD-05 Plus Mid Boost On loaded dynamic headphone type

Graphics setting view

Channel

Range

Frequency response of amplifier loaded dynamic headphone type @ 40 Hz - 15 kHz

Channel:	Left	Right
TEST 10000 ? + xDuoo XD-05 Plus Mid Boost On	0.0	0.0	dB
Grado GH4 Limited Edition + xDuoo XD-05 Plus Mid Boost On	0.4	0.4	dB

Brief information

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

On the frequency response comparison page, there is an export option and additional tools for adjusting the frequency response

Frequency response xDuoo XD-05 Plus Mid Boost On loaded type balance armature headphone type

Graphics setting view

Channel

Range

Frequency response of amplifier loaded type balance armature headphone type @ 40 Hz - 15 kHz

Channel:	Left	Right
TEST 10000 ? + xDuoo XD-05 Plus Mid Boost On	0.0	0.0	dB
Campfire Audio Andromeda + xDuoo XD-05 Plus Mid Boost On	3.4	3.4	dB
Fearless Audio S8F Freedom + xDuoo XD-05 Plus Mid Boost On	2.8	2.5	dB

Brief information

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

On the frequency response comparison page, there is an export option and additional tools for adjusting the frequency response

THD vs load vs output voltage xDuoo XD-05 Plus Mid Boost On

Graphics setting view

Channel

Load

Harmonic, number

Range

Graphics setting view

Channel

Load

Harmonic, number

Range

Graphics setting view

Channel

Load

Range

Brief information

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Maximum voltage output level vs load xDuoo XD-05 Plus Mid Boost On

Graphics setting view

Type of chart

RAW coordinates

Power characteristics of the	Voltage		Current
	dBV	V_RMS	dB(mA)	mA
Linear Mode	12.1	4.0	19.1	9.0
Optimal Mode	12.1	4.0	26.9	22.1
Hard Mode	12.1	4.0	44.0	158.2
Maximum mode	12.1	4.0	44.0	158.2

Volume Control Type	Analog
Optimal range of volume control	36.0	dB

Comparison xDuoo XD-05 Plus Mid Boost On and another amplifiers by loudness (Volume Level)

Main characteristics of the xDuoo XD-05 Plus Mid Boost On

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Maximum voltage output level vs load xDuoo XD-05 Plus Mid Boost On

Graphics setting view

Type of chart

RAW coordinates

Maximum Amplifier Voltage Level

Load	Linear Mode		Optimal Mode		Hard Mode		Max, before clipping
	dBV	V_RMS	dBV	V_RMS	dBV	V_RMS	dBV	V_RMS
15.8 ohm	-19.0	0.1	-10.0	0.1	8.0	0.1	8.0	0.1
24.5 ohm	-9.7	0.3	-3.7	0.3	11.3	0.3	11.3	0.3
30.5 ohm	-13.5	0.2	-3.5	0.2	11.5	0.2	11.5	0.2
62.4 ohm	-6.2	0.5	2.8	0.5	11.8	0.5	11.8	0.5
100 ohm	2.9	1.4	5.9	1.4	11.9	1.4	11.9	1.4
198.9 ohm	3.0	1.4	12.0	1.4	12.0	1.4	12.0	1.4
300 ohm	6.1	2.0	12.1	2.0	12.1	2.0	12.1	2.0
763 ohm	12.1	4.0	12.1	4.0	12.1	4.0	12.1	4.0
Not loaded	12.1	4.0	12.1	4.0	12.1	4.0	12.1	4.0

Maximum level of amplifier current

Load	Linear Mode		Optimal Mode		Hard Mode		Max, before clipping
	dB(mA)	mA	dB(mA)	mA	dB(mA)	mA	dB(mA)	mA
15.8 ohm	17.0	7.1	26.0	19.9	44.0	158.2	44.0	158.2
24.5 ohm	22.6	13.4	28.6	26.8	43.6	150.6	43.6	150.6
30.5 ohm	16.8	6.9	26.8	21.9	41.8	123.2	41.8	123.2
62.4 ohm	17.9	7.9	26.9	22.2	35.9	62.5	35.9	62.5
100 ohm	22.9	14.0	25.9	19.8	31.9	39.5	31.9	39.5
198.9 ohm	17.1	7.1	26.1	20.1	26.1	20.1	26.1	20.1
300 ohm	16.5	6.7	22.5	13.4	22.5	13.4	22.5	13.4
763 ohm	14.5	5.3	14.5	5.3	14.5	5.3	14.5	5.3

Power

Load	Linear Mode		Optimal Mode		Hard Mode		Max, before clipping
	dBm	mW	dBm	mW	dBm	mW	dBm	mW
15.8 ohm	-1.0	0.8	8.0	6.3	26.0	395.4	26.0	395.4
24.5 ohm	6.4	4.4	12.4	17.6	27.4	555.4	27.4	555.4
30.5 ohm	1.7	1.5	11.7	14.6	26.7	463.1	26.7	463.1
62.4 ohm	5.9	3.9	14.9	30.7	23.9	243.7	23.9	243.7
100 ohm	12.9	19.7	15.9	39.2	21.9	156.2	21.9	156.2
198.9 ohm	10.0	10.1	19.0	80.3	19.0	80.3	19.0	80.3
300 ohm	11.3	13.5	17.3	53.7	17.3	53.7	17.3	53.7
763 ohm	13.3	21.3	13.3	21.3	13.3	21.3	13.3	21.3

Brief information

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

Spectrum of Total Harmonic Distortion vs Level xDuoo XD-05 Plus Mid Boost On (as headphone amplifier)

Graphics setting view

Channel

Level

Range

Graphics setting view

Channel

Level

Range

Graphics setting view

Channel

Shift

dBm

Range

Graphics setting view

Channel

Shift

dBV

Range

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Spectrum of Multitone Distortion vs Level vs Load xDuoo XD-05 Plus Mid Boost On (as headphone amplifier)

Graphics setting view

Channel

Level

Range

Graphics setting view

Channel

Level

Range

Graphics setting view

Channel

Shift

dBm

Range

Graphics setting view

Channel

Shift

dBV

Range

Brief information

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Spectrum of IMD SMPTE vs Level xDuoo XD-05 Plus Mid Boost On (as headphone amplifier)

Graphics setting view

Channel

Level

Range

Range

Graphics setting view

Channel

Level

Range

Range

Graphics setting view

Channel

Shift

Range

dBm

Range

Graphics setting view

Channel

Shift

Range

dBV

Range

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Spectrum of IMD CCIF vs Level xDuoo XD-05 Plus Mid Boost On (as headphone amplifier)

Graphics setting view

Channel

Level

Range

Graphics setting view

Channel

Level

Range

Graphics setting view

Channel

Shift

dBm

Range

Graphics setting view

Channel

Shift

dBV

Range

Brief information

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More detailed

Measurements of xDuoo XD-05 Plus Mid Boost On were carried out by Roman Kuznetsov on the hardware-software complex RAA.

The xDuoo XD-05 Plus Mid Boost On 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

Information for Authors. You can freely use the graphics in your articles with a link to us.

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