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 TEST ? 0 ?

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 TEST AMP ➘ 0 Ω (as headphone amplifier)

Frequency response, Impedance and Frequency response with standard headphones

Average value of impedance band in 40 Hz - 15 kHz

1.1

ohm

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 TEST ? 0 ? were carried out by Roman Kuznetsov on the hardware-software complex RAA.

The TEST ? 0 ? 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

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TEST AMP ➘ 0 Ω is available in reports and services. You are in a professional report.

Information for entry level users

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Information for professionals

report for a pro

Comparison of on-line graphs

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

Channel:	Left	Right
Impedance average in band from 40 Hz - 15 kHz	1.1	1.1	ohm
The minimum value in band from 40 Hz - 15 kHz	0.0	0.0	ohm
The maximum value in band from 40 Hz - 15 kHz	8.1	8.1	ohm

Channel:	Left	Right
TEST 16 ? + TEST ? 0 ?	4.2	4.2	dB
TEST 32 ? + TEST ? 0 ?	2.4	2.4	dB
TEST 64 ? + TEST ? 0 ?	1.3	1.3	dB
TEST 126 ? + TEST ? 0 ?	0.7	0.7	dB
TEST 256 ? + TEST ? 0 ?	0.3	0.3	dB
TEST 512 ? + TEST ? 0 ?	0.2	0.2	dB

Channel:	Left	Right
TEST 10000 ? + TEST ? 0 ?	0.0	0.0	dB
Grado GH4 Limited Edition + TEST ? 0 ?	1.3	1.4	dB

TEST AMP ➘ 0 Ω

About this report

Test report - general data TEST AMP ➘ 0 Ω (as headphone amplifier)

Frequency response, Impedance and Frequency response with standard headphones

Frequency response TEST ? 0 ? (as headphone amplifier)

Impedance TEST ? 0 ? (as headphone amplifier)

Frequency response TEST ? 0 ? with resistive load

Frequency response TEST ? 0 ? loaded dynamic headphone type

Frequency response TEST ? 0 ? loaded type balance armature headphone type

Comments

Channel:	Left	Right
TEST 10000 ? + TEST ? 0 ?	0.0	0.0	dB
Campfire Audio Andromeda + TEST ? 0 ?	11.4	11.2	dB
Fearless Audio S8F Freedom + TEST ? 0 ?	8.0	8.0	dB