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 Questyle QP1R L-Gain

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 Questyle QP1R (as headphone amplifier)

Frequency response, Impedance and Frequency response with standard headphones

Average value of impedance band in 40 Hz - 15 kHz

0.0

ohm

Brief information

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Crosstalk Questyle QP1R L-Gain (as headphone amplifier)

Graphics setting view

Channel

Range

Load

Channel:	Left	Right
Crosstalk @ 1 kHz @ 15.8 ohm	-63.8	-63.6	dB
Crosstalk @ 1 kHz @ Not loaded	-100.8	-96.3	dB

Brief information

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THD vs load vs output voltage Questyle QP1R L-Gain

Graphics setting view

Channel

Load

Harmonic, number

Graphics setting view

Channel

Load

Harmonic, number

Graphics setting view

Channel

Load

Brief information

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Maximum voltage output level vs load Questyle QP1R L-Gain

Graphics setting view

Type of chart

RAW coordinates

Power characteristics of the	Voltage		Current
	dBV	V_RMS	dB(mA)	mA
Equivalent class A	0.0	1.0	0.0	1.0
Equivalent class AB	0.0	1.0	0.0	1.0
Equivalent class B	0.0	1.0	0.0	1.0
Maximum mode	0.0	1.0	0.0	1.0

Volume Control Type	Analog
Optimal range of volume control	36.0	dB

Comparison Questyle QP1R L-Gain and another amplifiers by loudness (Volume Level)

Main characteristics of the Questyle QP1R L-Gain

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 Questyle QP1R L-Gain

Graphics setting view

Type of chart

RAW coordinates

Maximum Amplifier Voltage Level

Load	Pure or equal class A		Optimal or equal class AB		Hard or equal class B		Max, before clipping
	dBV	V_RMS	dBV	V_RMS	dBV	V_RMS	dBV	V_RMS

Maximum level of amplifier current

Load	Pure or equal class A		Optimal or equal class AB		Hard or equal class B		Max, before clipping
	dB(mA)	mA	dB(mA)	mA	dB(mA)	mA	dB(mA)	mA

Power

Load	Pure or equal class A		Optimal or equal class AB		Hard or equal class B		Max, before clipping
	dBm	mW	dBm	mW	dBm	mW	dBm	mW

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 Questyle QP1R L-Gain (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 Questyle QP1R L-Gain (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 Questyle QP1R L-Gain (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 Questyle QP1R L-Gain (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 Noise Distortion vs Level vs Load Questyle QP1R L-Gain (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 Questyle QP1R L-Gain were carried out by Roman Kuznetsov on the hardware-software complex RAA.

The Questyle QP1R L-Gain 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.