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 FX-Audio R06 Balanced Out

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 FX-Audio R06 (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	9.0	ohm
Voltage: Linear Mode / Maximum or before clipping level	21.0/21.0	dBV
	11.3/11.3	V_RMS
Current: Linear Mode / Maximum or before clipping level	44.6/44.3	dB(mA)
	169.7/164.8	mA

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Frequency response FX-Audio R06 Balanced Out (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 FX-Audio R06 Balanced Out (as headphone amplifier)

Graphics setting view

Channel

Channel:	Left	Right
Impedance average in band from 40 Hz - 15 kHz	9.0	8.9	ohm
The minimum value in band from 40 Hz - 15 kHz	9.0	8.9	ohm
The maximum value in band from 40 Hz - 15 kHz	9.0	8.9	ohm

Comparison of basic characteristics AMPs

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Crosstalk FX-Audio R06 Balanced Out (as headphone amplifier)

Graphics setting view

Channel

Range

Load

Channel:	Left	Right
Crosstalk @ 1 kHz @ 15.8 ohm	-98.7	-100.0	dB
Crosstalk @ 1 kHz @ 24.5 ohm	-105.3	-106.7	dB
Crosstalk @ 1 kHz @ 30.5 ohm	-109.1	-98.3	dB
Crosstalk @ 1 kHz @ 62.4 ohm	-99.9	-99.8	dB
Crosstalk @ 1 kHz @ 100.0 ohm	-109.6	-102.8	dB
Crosstalk @ 1 kHz @ 198.9 ohm	-103.5	-102.1	dB
Crosstalk @ 1 kHz @ 300.0 ohm	-104.1	-103.4	dB
Crosstalk @ 1 kHz @ 763.0 ohm	-104.2	-101.5	dB
Crosstalk @ 1 kHz @ Not loaded	-101.7	-108.3	dB

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Crosstalk Phase FX-Audio R06 Balanced Out (as headphone amplifier)

Graphics setting view

Channel

Load

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Frequency response FX-Audio R06 Balanced Out with resistive load

Graphics setting view

Channel

Range

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

Channel:	Left	Right
TEST 16 ? + FX-Audio R06 Balanced Out	0.0	0.0	dB
TEST 32 ? + FX-Audio R06 Balanced Out	0.0	0.0	dB
TEST 64 ? + FX-Audio R06 Balanced Out	0.0	0.0	dB
TEST 126 ? + FX-Audio R06 Balanced Out	0.0	0.0	dB
TEST 256 ? + FX-Audio R06 Balanced Out	0.0	0.0	dB
TEST 512 ? + FX-Audio R06 Balanced Out	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 FX-Audio R06 Balanced Out 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 ? + FX-Audio R06 Balanced Out	0.0	0.0	dB
Grado GH4 Limited Edition + FX-Audio R06 Balanced Out	1.4	1.3	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 FX-Audio R06 Balanced Out 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 ? + FX-Audio R06 Balanced Out	0.0	0.0	dB
Campfire Audio Andromeda + FX-Audio R06 Balanced Out	8.1	8.0	dB
Fearless Audio S8F Freedom + FX-Audio R06 Balanced Out	6.5	6.0	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

THD vs load vs output voltage FX-Audio R06 Balanced Out

Graphics setting view

Channel

Load

Harmonic, number

Range

Graphics setting view

Channel

Load

Harmonic, number

Range

Graphics setting view

Channel

Load

Range

Brief information

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

Maximum voltage output level vs load FX-Audio R06 Balanced Out

Graphics setting view

Type of chart

RAW coordinates

Power characteristics of the	Voltage		Current
	dBV	V_RMS	dB(mA)	mA
Linear Mode	21.0	11.3	44.6	169.7
Optimal Mode	21.0	11.3	44.3	164.8
Hard Mode	21.0	11.3	44.3	164.8
Maximum mode	21.0	11.3	44.3	164.8

Volume Control Type	Analog
Optimal range of volume control	36.0	dB

Comparison FX-Audio R06 Balanced Out and another amplifiers by loudness (Volume Level)

Main characteristics of the FX-Audio R06 Balanced Out

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Maximum voltage output level vs load FX-Audio R06 Balanced Out

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	7.6	2.4	7.6	2.4	7.6	2.4	7.6	2.4
24.5 ohm	12.7	4.3	12.7	4.3	12.7	4.3	12.7	4.3
30.5 ohm	14.8	5.5	18.8	5.5	18.8	5.5	18.8	5.5
62.4 ohm	19.8	9.8	19.8	9.8	19.8	9.8	19.8	9.8
100 ohm	20.3	10.3	20.3	10.3	20.3	10.3	20.3	10.3
198.9 ohm	20.6	10.7	20.6	10.7	20.6	10.7	20.6	10.7
300 ohm	20.8	10.9	20.8	10.9	20.8	10.9	20.8	10.9
763 ohm	20.9	11.1	20.9	11.1	20.9	11.1	20.9	11.1
Not loaded	21.0	11.3	21.0	11.3	21.0	11.3	21.0	11.3

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	43.7	152.5	43.7	152.5	43.7	152.5	43.7	152.5
24.5 ohm	45.0	177.1	45.0	177.1	45.0	177.1	45.0	177.1
30.5 ohm	45.1	179.5	49.1	284.6	49.1	284.6	49.1	284.6
62.4 ohm	43.9	157.1	43.9	157.1	43.9	157.1	43.9	157.1
100 ohm	40.3	103.0	40.3	103.0	40.3	103.0	40.3	103.0
198.9 ohm	34.7	54.0	34.7	54.0	34.7	54.0	34.7	54.0
300 ohm	31.2	36.4	31.2	36.4	31.2	36.4	31.2	36.4
763 ohm	23.3	14.6	23.3	14.6	23.3	14.6	23.3	14.6

Power

Load	Linear Mode		Optimal Mode		Hard Mode		Max, before clipping
	dBm	mW	dBm	mW	dBm	mW	dBm	mW
15.8 ohm	25.7	367.6	25.7	367.6	25.7	367.6	25.7	367.6
24.5 ohm	28.9	768.8	28.9	768.8	28.9	768.8	28.9	768.8
30.5 ohm	29.9	983.2	33.9	2470.2	33.9	2470.2	33.9	2470.2
62.4 ohm	31.9	1540.6	31.9	1540.6	31.9	1540.6	31.9	1540.6
100 ohm	30.3	1061.1	30.3	1061.1	30.3	1061.1	30.3	1061.1
198.9 ohm	27.6	580.8	27.6	580.8	27.6	580.8	27.6	580.8
300 ohm	26.0	396.5	26.0	396.5	26.0	396.5	26.0	396.5
763 ohm	22.1	161.8	22.1	161.8	22.1	161.8	22.1	161.8

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 FX-Audio R06 Balanced Out (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

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

Spectrum of Multitone Distortion vs Level vs Load FX-Audio R06 Balanced Out (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

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

Spectrum of IMD SMPTE vs Level FX-Audio R06 Balanced Out (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

Brief information

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

Spectrum of IMD CCIF vs Level FX-Audio R06 Balanced Out (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

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

More detailed

Measurements of FX-Audio R06 Balanced Out were carried out by Roman Kuznetsov on the hardware-software complex RAA.

The FX-Audio R06 Balanced Out 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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