Measurement's report Topping Professional E2x2 OTG Hi Gain - Reference Audio Analyzer

Topping Professional E2x2 OTG

Hi Gain
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 Topping Professional E2x2 OTG Hi 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 Topping Professional E2x2 OTG (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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The main parameters of the universal block diagram of the amplifier
Average value of impedance band in 40 Hz - 15 kHz1.0ohm
Voltage:
Linear Mode / Maximum or before clipping level
14.4/14.4dBV
5.3/5.3VRMS
Current:
Linear Mode / Maximum or before clipping level
31.0/41.3dB(mA)
35.6/116.4mA


General data - Signal/Noise
RMS dBFS (C) dBFS (A) dBFS 22 - 22k UNW
Left Right Left Right Left Right Left Right
Signal-to-noise ratio from the minimum background noise level, dB -132.63 -132.84 -134.35 -134.68 -133.45 -133.88 -132.65 -132.98
Volume control range, dB 91.64 91.40
Noise floor level at the minimum volume level position, dBV -118.20 -118.41 -119.92 -120.25 -119.02 -119.45 -118.22 -118.55
Noise floor level at the minimum volume level position, µVRMS 1.23 1.20 1.01 0.97 1.12 1.07 1.23 1.18
Optimal range of volume control, dB 42.67 42.57 46.15 46.08 45.05 44.98 42.75 42.68
Maximum level at 0 dBFS, dBV 14.43 14.43
Additional information
Signal-to-noise at maximum volume level, dB -112.67 -112.57 -116.15 -116.08 -115.05 -114.98 -112.75 -112.68
Noise floor level at maximum volume level, dBV -98.24 -98.14 -101.72 -101.65 -100.62 -100.55 -98.32 -98.25
The difference in noise floor from the minimum and maximum volume levels, dB 19.96 20.27 18.20 18.60 18.40 18.90 19.90 20.30

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Frequency response Topping Professional E2x2 OTG Hi Gain (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



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



Impedance Topping Professional E2x2 OTG Hi Gain (as headphone amplifier)

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Channel

Channel:LeftRight
Impedance average in band from 40 Hz - 15 kHz1.0 1.0ohm
The minimum value in band from 40 Hz - 15 kHz1.0 1.0ohm
The maximum value in band from 40 Hz - 15 kHz1.0 1.0ohm


Comparison of basic characteristics AMPs


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Crosstalk Topping Professional E2x2 OTG Hi Gain (as headphone amplifier)

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Channel

Range

Load

Channel:LeftRight
Crosstalk @ 1 kHz @ 15.8 ohm -67.9 -67.9dB
Crosstalk @ 1 kHz @ 24.5 ohm -71.4 -71.5dB
Crosstalk @ 1 kHz @ 30.5 ohm -73.9 -74.3dB
Crosstalk @ 1 kHz @ 62.4 ohm -81.2 -83.8dB
Crosstalk @ 1 kHz @ 100.0 ohm -87.9 -90.2dB
Crosstalk @ 1 kHz @ 198.9 ohm -91.6 -92.6dB
Crosstalk @ 1 kHz @ 300.0 ohm -94.6 -90.2dB
Crosstalk @ 1 kHz @ 763.0 ohm -91.1 -88.0dB
Crosstalk @ 1 kHz @ Not loaded-87.7 -87.3dB



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Crosstalk Phase Topping Professional E2x2 OTG Hi Gain (as headphone amplifier)

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Channel

Load




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Frequency response Topping Professional E2x2 OTG Hi Gain with resistive load

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Range

Frequency response of amplifier with resistive load @ 40 Hz - 15 kHz
Channel:LeftRight
TEST 16 ? + Topping Professional E2x2 OTG Hi Gain 0.00.0dB
TEST 32 ? + Topping Professional E2x2 OTG Hi Gain 0.00.0dB
TEST 64 ? + Topping Professional E2x2 OTG Hi Gain 0.00.0dB
TEST 126 ? + Topping Professional E2x2 OTG Hi Gain 0.00.0dB
TEST 256 ? + Topping Professional E2x2 OTG Hi Gain 0.00.0dB
TEST 512 ? + Topping Professional E2x2 OTG Hi Gain 0.00.0dB



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 Topping Professional E2x2 OTG Hi Gain loaded dynamic headphone type

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Channel

Range

Frequency response of amplifier loaded dynamic headphone type @ 40 Hz - 15 kHz
Channel:LeftRight
TEST 10000 ? + Topping Professional E2x2 OTG Hi Gain 0.00.0dB
Grado GH4 Limited Edition + Topping Professional E2x2 OTG Hi Gain 0.20.2dB



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 Topping Professional E2x2 OTG Hi Gain 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
TEST 10000 ? + Topping Professional E2x2 OTG Hi Gain 0.00.0dB
Campfire Audio Andromeda + Topping Professional E2x2 OTG Hi Gain 1.71.7dB
Fearless Audio S8F Freedom + Topping Professional E2x2 OTG Hi Gain 1.41.3dB



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 Topping Professional E2x2 OTG Hi Gain

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Channel

Load

Harmonic, number

Range

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Channel

Load

Harmonic, number

Range

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Channel

Load

Range


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Maximum voltage output level vs load Topping Professional E2x2 OTG Hi Gain

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Type of chart

RAW coordinates

Power characteristics of the Voltage Current
dBVVRMSdB(mA)mA
Linear Mode14.45.331.035.6
Optimal Mode14.45.341.3116.4
Hard Mode14.45.341.3116.4
Maximum mode 14.45.341.3116.4


Volume Control TypeAnalog
Optimal range of volume control48.0dB


Comparison Topping Professional E2x2 OTG Hi Gain and another amplifiers by loudness (Volume Level)

Main characteristics of the Topping Professional E2x2 OTG Hi Gain


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Maximum voltage output level vs load Topping Professional E2x2 OTG Hi Gain

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RAW coordinates

Maximum Amplifier Voltage Level
Load Linear ModeOptimal ModeHard ModeMax, before clipping
dBVVRMSdBVVRMSdBVVRMSdBVVRMS
15.8 ohm -5.40.56.60.56.60.56.60.5
24.5 ohm -1.00.98.00.98.00.98.00.9
30.5 ohm 1.71.210.71.210.71.210.71.2
62.4 ohm 6.82.212.82.212.82.212.82.2
100 ohm 10.33.313.33.313.33.313.33.3
198.9 ohm 13.14.514.14.514.14.514.14.5
300 ohm 13.14.514.14.514.14.514.14.5
763 ohm 13.24.514.24.514.24.514.24.5
Not loaded14.45.314.45.314.45.314.45.3



Maximum level of amplifier current
Load Linear ModeOptimal ModeHard ModeMax, before clipping
dB(mA)mAdB(mA)mAdB(mA)mAdB(mA)mA
15.8 ohm 30.634.042.6135.242.6135.242.6135.2
24.5 ohm 31.236.240.2102.140.2102.140.2102.1
30.5 ohm 32.039.741.0111.941.0111.941.0111.9
62.4 ohm 30.935.336.970.336.970.336.970.3
100 ohm 30.332.933.346.433.346.433.346.4
198.9 ohm 27.222.828.225.628.225.628.225.6
300 ohm 23.615.124.617.024.617.024.617.0
763 ohm 15.56.016.56.716.56.716.56.7


Power
Load Linear ModeOptimal ModeHard ModeMax, before clipping
dBmmWdBmmWdBmmWdBmmW
15.8 ohm 12.618.224.6288.824.6288.824.6288.8
24.5 ohm 15.132.224.1255.524.1255.524.1255.5
30.5 ohm 16.848.125.8382.025.8382.025.8382.0
62.4 ohm 18.977.624.9308.824.9308.824.9308.8
100 ohm 20.3108.023.3215.423.3215.423.3215.4
198.9 ohm 20.1103.221.1129.921.1129.921.1129.9
300 ohm 18.468.619.486.419.486.419.486.4
763 ohm 14.327.115.334.115.334.115.334.1



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 Topping Professional E2x2 OTG Hi Gain (as headphone amplifier)

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Channel

Level

Range

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Channel

Level

Range

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Shift

dBm

Range

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Shift

dBV

Range




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Spectrum of Multitone Distortion vs Level vs Load Topping Professional E2x2 OTG Hi Gain (as headphone amplifier)

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Channel

Level

Range

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Level

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Shift

dBm

Range

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Shift

dBV

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Spectrum of IMD SMPTE vs Level Topping Professional E2x2 OTG Hi Gain (as headphone amplifier)

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Channel

Level

Range

Range

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Level

Range

Range

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Shift

Range

dBm

Range

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dBV

Range


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Spectrum of IMD CCIF vs Level Topping Professional E2x2 OTG Hi Gain (as headphone amplifier)

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Channel

Level

Range

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Channel

Level

Range

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Shift

dBm

Range

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dBV

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More detailed

Measurements of Topping Professional E2x2 OTG Hi Gain were carried out by Roman Kuznetsov on the hardware-software complex RAA.

The Topping Professional E2x2 OTG Hi 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.

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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Topping Professional E2x2 OTG is available in reports and services. You are in a professional report.

Information for entry level users

    reports for a newbie (Headphone amplifier)
    The automatic selection of the optimal AMP models









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