Benjie X1 - Test report a newbie-dummies Reference Audio Analyzer
Benjie X1
Headphone amplifierHeadphone amplifier
Headphone amplifierHeadphone amplifier
DAC Line Out16 bit
24 bit



Manufacturers / Benjie

Test report Benjie X1 (report for a newbie)





About the simple report
This is the simply report for dummies who are poorly versed in the characteristics of the amp part of various devices and don’t understand specialized graphs.

Information in this report is presented in simple and clear form. Data interpretation were made as simple as possible and accordingly hadn’t much subtleties and nuances. Simple report is sufficient for a general assessment of the device. For more complete and accurate assessment you should read professional report.

All characteristics are accompanied by detailed explanations to enable reader to gradually understand dependencies between the characteristics. The aim is to give you ability to understand a more complex professional report.

For example, when choose new computer video card, many persons do not understand the set of tables with the final data of the test packages of video cards. How to understand the relative difference in these figures? In most cases, the unprepared reader is satisfied with only the textual evaluation of the author, without delving into the figures. When the choice of a product is done thoroughly and consciously, then the reader gradually deepens into complex tables, mastering information from simple to complex.

We made the separation of reports into "simple" and "complex", where a simple report with explanations will allow you to gradually understand and professional report.

General characteristics of the amp part of Benjie X1

Output Impedance
4.88 ohm

Characteristics for the high quality mode

About the high quality mode
We make borders for the maximum characteristics for current and voltage by sound signal reproduction quality levels. In general, when the volume level is increased, the sound quality of the amplifier degrade. Approximately as a car above a certain speed becomes less manageable. High-quality mode is a mode in which it is considered that the amplifier works as clear as possible without distortion and corresponds to the equivalent class A F.A.Q.. As a car at speed with excellent manageability.

Power characteristics of the Benjie X1
Headphone impedance, ohm
Power, mW
Voltage, dBV
32
0.25
-21.04
300
0.82
-6.09

Recommended impedance for headphones from the range 8 - 1008 ohm
For In-Ear Headphones
40 - 42 ohm
For Over-Ear Headphones
No recommendation, Amp is too quiet

Characteristics for the maximum mode

About the maximum mode
We make borders for the maximum characteristics for current and voltage by sound signal reproduction quality levels. In general, when the volume level is increased, the sound quality of the amplifier degrade. The maximum mode F.A.Q. is a mode in which it is considered that the amplifier operates without an audible wheeze from overloading (clipping) F.A.Q. or this is the maximum position of the volume control and a higher volume level is not possible. As if the car has already reached a speed above which manageability is lost or the car can not reach a higher speed.

Power characteristics of the Benjie X1
Headphone impedance, ohm
Power, mW
Voltage, dBV
32
5.98
-7.18
300
0.82
-6.09

Recommended impedance for headphones from the range 8 - 1008 ohm
For In-Ear Headphones
8 - 42 ohm
For Over-Ear Headphones
No recommendation, Amp is too quiet

How is the range of recommended impedances determined?
Recommended headphone impedances are determined for in-headphones with a sensitivity of 109 dB / mW SPL and full-sized 100 dB / mW SPL while providing a maximum sound pressure level of 116 dB SPL (average sound pressure level will be 20 dB less, since the music track is usually contains not only loud parts, but also quiet ones).

Detailed description in article Recommended headphone impedance for the amplifier.


How to compare amplifiers by loudness?
When you compare amplifiers by loudness, the voltage value, expressed in dBV, should be used. The difference in voltage will show the difference in decibel (dB) between the amplifiers.

The power values in regular mW do not convenient to direct comparison.

The direct comparison by power is only suitable for speaker amplifiers operating with an ultra-low-ohm load. This does not apply to headphone amplifiers where the headphone resistance is higher than 8-16 ohms.

Because of the higher resistance of the headphones, when compare the volume of a musical signal it is necessary to simultaneously take into account the current and voltage limits. The speaker amplifier have limit by current. For the exact difference between the amplifiers in decibel, the power value must be converted into voltage in units of dBV, taking into account the margin by current for the music signal to 12 dB.

If made a comparison simply by power, then the error will reach up to 12 dB. When sorting by volume, you can see that at the same volume values in dBV, the power values in mW will be different.

What and how to compare with the characteristics provided by manufacturers
The value of the high quality mode power is equivalent to class A. Typically, manufacturers for this power indicate the percentage of distortion, which should be no more than 1%.

Simply the Maximum power, this is the power level above, which the amplifier is already "wheezing" or the volume control is already at its maximum level. Usually indicated without a percentage of distortion, because high quality for this volume level is not implied.


Analysis and recommendations for the Benjie X1 based on the measured characteristics

Analysis and recommendations for Benjie X1 based on the measured characteristics
Headphones Areas of using headphones Voltage Not loaded Max F.A.Q. / in equal class A F.A.Q., dBV Current in equal class AF.A.Q., dB(mA) Noise Isolation Necessity Total
-5.95 /-5.95 8.86
In-Ear or Tablet
Sensitivity: 126 dB/V SPL
Impedance : 16 ohm
The type of acoustic design: Closed
Examples ±6 dB
Home or studio, where sound from the headphones does not bother anyone 5
★★★★★
5
★★★★★
1
★☆☆☆☆
3.7
★★★☆☆
Office and home, where people should not hear the sound from the headphones 5
★★★★★
5
★★★★★
5
★★★★★
5.0
★★★★★
Street with active traffic 5
★★★★★
5
★★★★★
1
★☆☆☆☆
3.7
★★★☆☆
Metro (subway), public transport 5
★★★★★
4
★★★★☆
5
★★★★★
4.3
★★★★☆
In-Ear or Tablet
Sensitivity: 120 dB/V SPL
Impedance : 32 ohm
The type of acoustic design: Open
Examples ±6 dB
Home or studio, where sound from the headphones does not bother anyone 5
★★★★★
5
★★★★★
5
★★★★★
5.0
★★★★★
Office and home, where people should not hear the sound from the headphones 5
★★★★★
5
★★★★★
1
★☆☆☆☆
3.7
★★★☆☆
Street with active traffic 4
★★★★☆
4
★★★★☆
5
★★★★★
4.3
★★★★☆
Metro (subway), public transport 3
★★★☆☆
3
★★★☆☆
1
★☆☆☆☆
2.3
★★☆☆☆
Over-ear Low impedance
Sensitivity: 115 dB/V SPL
Impedance : 32 ohm
The type of acoustic design: Closed
Examples ±6 dB
Home or studio, where sound from the headphones does not bother anyone 5
★★★★★
5
★★★★★
1
★☆☆☆☆
3.7
★★★☆☆
Office and home, where people should not hear the sound from the headphones 5
★★★★★
5
★★★★★
5
★★★★★
5.0
★★★★★
Street with active traffic 4
★★★★☆
4
★★★★☆
1
★☆☆☆☆
3.0
★★★☆☆
Metro (subway), public transport 3
★★★☆☆
3
★★★☆☆
5
★★★★★
3.7
★★★☆☆
Over-ear Low impedance
Sensitivity: 115 dB/V SPL
Impedance : 32 ohm
The type of acoustic design: Open
Examples ±6 dB
Home or studio, where sound from the headphones does not bother anyone 4
★★★★☆
4
★★★★☆
5
★★★★★
4.3
★★★★☆
Street with active traffic 3
★★★☆☆
3
★★★☆☆
5
★★★★★
3.7
★★★☆☆
Metro (subway), public transport 2
★★☆☆☆
2
★★☆☆☆
1
★☆☆☆☆
1.7
★☆☆☆☆
Over-ear Hi impedance
Sensitivity: 105 dB/V SPL
Impedance : 300 ohm
The type of acoustic design: Open
Examples ±6 dB
Home or studio, where sound from the headphones does not bother anyone 3
★★★☆☆
5
★★★★★
5
★★★★★
3.7
★★★☆☆
Street with active traffic 2
★★☆☆☆
4
★★★★☆
5
★★★★★
3.0
★★★☆☆
Over-ear Low Sensitivity
Sensitivity: 95 dB/V SPL
Impedance : 60 ohm
The type of acoustic design: Open
Examples ±6 dB
Home or studio, where sound from the headphones does not bother anyone 1
★☆☆☆☆
1
★☆☆☆☆
5
★★★★★
2.3
★★☆☆☆


About the table of recommendations
The table shows the most common "typical" headphones and the field of application of headphones with an amplifier.

Typically, the power limit for low-impedance headphones is current. For high-resistance headphones the power limit is voltage. In the table, these restrictions are evaluated separately.

The compatibility rating is similar to car analysis by its clearance. When we know clearance we can estimate which type of road will optimally for that car without evaluating the class of the car. On a race car of Formula 1 is difficult to drive on a ground road. The same foolish idea to use caterpillar all-terrain vehicle on a highway.

Detailed description formula of the table of AMPs.

To assess the compatibility of the amp part and the sencivity of headphones, we assume that the user will listen to music at a loudness level of 90 dB SPL. Depending on external conditions, this volume level varies and we estimate the conditions under which the sound source will play in a high-quality mode, and in which conditions there will be hear a lack of volume level, unnecessary distortions or other negative factors.


Description of the characteristics and recommendations for Benjie X1 on the table of recommendations


In the table, the characteristics are interpreted and then the ratings are given on a five-point scale. You can see below the more comprehensive analysis of the characteristics by the algorithms used in the table.


The table provides two main estimates for the amplifier: an estimate by current and an estimate by voltage. The characteristics of the headphones and the environment affect the final desired voltage level from the amplifier output, which must provide a sufficiently level of loudness from the headphones.


Main characteristics of the Benjie X1

The main "universal" characteristics of the amplifier are maximum current, maximum voltage and output impedance.

Значения тока и напряжения может быть разделено по порогам качества.

В общем случае, при увеличении громкости, качество звучания усилителя ухудшается. Примерно как автомобиль с определенной скороcти становится менее управляемым. В этом отчете мы рассматриваем два порога.
  • Режим эквивалентного класса А F.A.Q. - высокое качества (как великолепная управляемость автомобиля на небольшой скорости).
  • Максимальный режим F.A.Q. - предельные характеристики, выше которых усилитель или хрипит или невозможно для него выставить уровень громкости выше (когда автомобиль теряет управляемость выше определенной скорости или не может развить скорость выше).
Voltage
  • The maximum voltage level F.A.Q. without load is -5.95 dBV.
  • The maximum voltage level in equivalent class A F.A.Q. without load is -5.95 dBV.
Уровень сигнала на выходе усилителя регулируется через напряжение. Именно этим параметром управляет регулятор громкости.

Current
  • The maximum current level F.A.Q. without load is 23.44 dB(mA)
  • The current level in equivalent class A F.A.Q. without load is 8.86 dB(mA).
В зависимости от сопротивления подключенных наушников и выставленного напряжения усилитель отдает ток. Уровнь тока пропорционален напряжению, а коэффициентом отношения тока и напряжения является сопротивление наушников как 1/R. Чем выше сопротивление у наушников, тем меньше требуется отдача тока от усилителя.

Impedance
  • The output impedance of the amplifier is 4.88 ohm.
Выходное сопротивление усилителя влияет на амплитуду напряжения с выхода усилителя при подключенных наушниках. Чем выше выходное сопротивления усилителя и ниже сопротивление наушников, тем амплитуда сигнала напряжения на выходе ниже.



Analyse of the output impedance of the Benjie X1


When load is on (headphones were connected) the output voltage level decreases depending on the output impedance of the amplifier. The Benjie X1 has an output impedance of 4.88 ohms.

This is a low-impedance, close to zero. With this impedance, the voltage drop at a low impedance load is small.

For а low-impedance load this is well because of good gain margin. But on low volume level background noise can be heard.


If the voltage is -5.90 at the 600 ohm load, then under load of 16 ohm voltage will decreases by -1.34 dB to -4.56 dBV.


Analysis of voltage and current Benjie X1 на графике


One of the main tasks of the detection of compatibility of headphones with a specific amplifier, is to find out whether the amplifier can give the optimum voltage level. That section describes with details how to construct a graph of maximum voltage from the music power from the initial parameters of the amplifier.

Based on the values of the maximum voltage F.A.Q. levels and impedance of the amplifier, the maximum voltage levels for the headphone impedances of interest are determined. On the graph in the example, these are the impedance: 16, 32, 70, 150, 300 and 600 ohms. Grey columns show maximum voltage levels.

Voltage values are expressed not in volts, but in decibels to 1 volt - dBV. This allows you to compare the volume immediately in dB, which many are used in the equalizer and while adjust the volume.

We are interested not only in how loud the amplifier can work, but also to determine the range on what volume level we can get good quality. So we make estimation according to the voltage and current data of the in equivalent class A F.A.Q..

The lilac color area shows the voltage range for the equivalent class A under load without current limitation. This region is constructed in the same way as for the maximum voltage, depending on the magnitude of the load. However, each load value requires a certain current level at the output voltage at the amplifier output. Yellow area indicates the voltage range for the equivalent class A under load with only a current limitation with a margin of 12 dB (correction for a musical signal). From two areas, a green area is obtained - a range that enters both the lilac and yellow zones simultaneously. This is the desired range, which is optimal for the amplifier.

The lower bound for the yellow, lilac and green ranges in the form of the minimum voltage value is determined by the maximum level minus 36 dB. It is often believed that the louder the amplifier is the better, but it is not. If the amplifier is excessively loud, then when you lower the volume level, you often have to deal with different problems: audible background noise or channel imbalance.

  • Digital volume control - when the volume is lowered by program way or through the controller in the DAC, the useful signal decreases in amplitude, but the background noise remains at the same level. After lowering the volume to a comfortable level, you can hear definitely clear the noise in high-sensitivity headphones (or in middle- sensitivity headphones if the amplifier is initially very loud / powerful).
    In smart phones, tablets and laptops in the low volume area there can be a noticeable contribution of distortions from the software algorithms of SSRC, which are even more destructive than background noise. Moreover, where volume control is performed through the OS (Windows, Linux), the volume control range may not exceed 48 dB and the user will have a choice between the loud sound and its total absence.
  • Analogue volume control - most analogue controls have an unbalance in the low volume level, when one channel sounds quieter than the other. To obtain a better volume control, use variable resistors from ALPS. In this case, imbalance is observed at much lower volume levels. To obtain maximum quality, discrete regulators (stepped volume control) are used. Но, обычно шаг регулировки в области низких громкости - большой.
It is best to use an amplifier with such a margin in volume that for the headphones used, the range of volume down regulation does not exceed 36 dB.

Thus, the lower level is limited by the recommended volume control range, and the upper level is calculated based on the current and voltage limits in the highest quality mode for this device, which we define as equivalent to class A.


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For headphones, based on their sensitivity, ambient conditions and the required volume level, the required voltage is calculated. If the required voltage value is under the green area, then the headphones will be too sensitive for Benjie X1 and to set the optimum volume level it will be necessary to lower the level by more than 36 dB from the maximum.

If the required voltage value is above the green area, then you have headphones with not enough sensitivity-level and / or amp with insufficient voltage level in the equivalent class A.

If the value is above the green area, but does not exceed the gray area, then the headphones will give the necessary volume level, but the sound will be less qualitative, because the amplifier will work already in less qualitative equivalent modes AB, B фтв maximum level.

If the value exceeds the maximum level, then the necessary volume level can not be reach, or will be clearly heard the "wheezing sound" from clipping.

The simplified formula of the desired voltage for headphones is as follows:
V = SPL - Sensitivity + Peak factor - Output voltage + Correction for external circumstances
where:
  • SPL - the desired sound pressure in dB SPL at the headphone output.
  • Sensitivity - the sensitivity of the headphones to the voltage.
  • Correction for a music signal of 20 dB to account for the unevenness of the volume on the sound track.
  • Output Voltage - the level of the output voltage of the amplifier in dBV when loaded of the headphone impedance.
  • The correction for external circumstances is the noise of the environment and the presence of noise insulation in the headphones.
Thus, we calculate the star rating for the table. You can study formulas more detailed.

The analysis for specific headphones can be viewed separately by selecting the appropriate headphone models on professional graphics.


Analysis of use Benjie X1 with headphones of different acoustic design


This rate primarily depends on the acoustic design of the headphones and the field of application of the headphones. Additionally, depending on the acoustic design, a correction is made to calculate the optimum volume level at which headphones are supposed to be used. In closed-type headphones due to noise isolation from outside sounds, the volume level can be slightly reduced, in calculations it is equal to -6 dB.


The table shows the options with closed and open headphones and ratings from 1 or 5.


Open headphones
When you use open type headphones, then people surrounding you can hear the music from the headphones, and the listener (you) - the surrounding sounds. Headphones without noise isolation are well suited for home and studio in a quiet environment, as well as on the street with traffic, because allowing you to notice the car in time. Headphones without noise isolation aren't fit to use in noisy public transport. Due to external noise it is necessary to increase the volume of the music, which is harmful for hearing at long listening and unpleasant to surrounding passengers. In the studio, when recording vocals or instruments on a microphone, open headphones are likewise not suitable, because sound from the "minus" from the headphones will fall into the microphone.


Closed headphones
When you use closed type headphones, it have passive noise isolation so for people near you the headphones play significantly quieter than for the listener (you). Sound from outside is similarly will be quiet inside headphones. Headphones with noise isolation are good for home use. You will not to disturb family mates with listening to music. Closed headphones will be good in a noisy office, allowing you not to be distracted. In noisy public transport in such headphones, playing music is more safe for hearing, because due to noise isolation it is possible to listen to music at an average or low volume level. In the studio, when recording vocals or musical instruments on a microphone, the closed type headphones fit best because sound from the "minus" of the headphones will not get into the microphone. But headphones with noise isolation are dangerous to use on the street with active traffic because you can hear beep or sound of car quieter then music.

Recommendation by compatibility of headphones with Benjie X1 based on measured characteristics

Benjie X1 with low-impedance high-sensitivity headphones (126 dB/V SPL 16 ohm ) имеет незначительный запас по громкости в виде 0.94 дБ. Есть хороший запас по регулировке громкости вниз на 28.26 дБ.

Benjie X1 with low-impedance middle-sensitivity headphones (115 dB/V SPL 32 ohm ) не имеет запаса по громкости как в качественном режиме эквивалентного класса А в виде -4.04 дБ, так и в менее качественных режимах в виде -2.18 дБ. Усилитель недостаточен для работы с такими наушниками, он будет тихим. Есть запас по регулировке громкости вниз более 36 дБ.

Benjie X1 with low-impedance low-sensitivity headphones (95 dB/V SPL 32 ohm ) не имеет запаса по громкости как в качественном режиме эквивалентного класса А в виде -24.04 дБ, так и в менее качественных режимах в виде -22.18 дБ. Усилитель недостаточен для работы с такими наушниками, он будет тихим. Есть запас по регулировке громкости вниз более 36 дБ.

Benjie X1 with middle-impedance low-sensitivity headphones (95 dB/V SPL 60 ohm ) не имеет запаса по громкости как в качественном режиме эквивалентного класса А в виде -21.63 дБ, так и в менее качественных режимах в виде -21.63 дБ. Усилитель недостаточен для работы с такими наушниками, он будет тихим. Есть запас по регулировке громкости вниз более 36 дБ.

Benjie X1 with hi-impedance low-sensitivity headphones (105 dB/V SPL 300 ohm ) не имеет запаса по громкости как в качественном режиме эквивалентного класса А в виде -11.09 дБ, так и в менее качественных режимах в виде -11.09 дБ. Усилитель недостаточен для работы с такими наушниками, он будет тихим. Есть запас по регулировке громкости вниз более 36 дБ.


Compatibility of a headphone with a AMP of loudness is feature of the AMP to provide sound pressure 90 dB SPL with with a margin of volume control, both up and down. Recommendations are given for home conditions, without correction for noise insolation and external noise.

Посмотреть отдельно рекомендации для другого желаемого звукового давления, конкретных наушников и xDuoo D3 nano.

A lot of manufacturers indicate the sensitivity of headphones to power, not to voltage. Therefore, in assessing the general case, the sensitivity value must be converted to voltage. Otherwise, the recommendations will be far from reality.

The simplified formula for the desired voltage is as follows:
V = SPL - Sensitivity + Peak factor - Output voltage
where
  • SPL - is the desired sound pressure level in dB SPL at the headphone output.
  • Sensitivity - the sensitivity of the headphones to the voltage in dB/V SPL.
  • Correction for a music signal of 20 dB to account for the unevenness of the volume of the soundtrack.
  • Output Voltage - the level of the output voltage of the amplifier when the headphone impedance in dBV is connected.



Selection of other AMPs
If in your situation, the Benjie X1 in the table do not have a high rating, you can choose more suitable AMPs models in a special on-line selection for the selected parameters. If fully suited, then similarly you can see what other models may suit you.

Selection of headphones for X1
The automatic selection of the optimal AMP models from Benjie X1 .
from the measured power parameters of the amplifying part and the measured parameters of the headphones for different purpose of use.

About of the universality of AMPs
For different purposes it is best to select individual AMPs, and not to look for some universal AMPs for all occasions. Unfortunately, some properties of AMPs mutually exclude the use of AMPs in different situations. True connoisseurs of quality sound use several pairs of AMPs. Headphone AMPs are compact and do not take up much space.


Анализ других измеренных характеристик Benjie X1

Мы готовим автоматический анализ с пояснениями и других характеристик и графиков, таких как:
  • Описание анализа к амплитудно-частотной характеристике
  • Изменение АЧХ от подключения усилителя к типовым наушникам
Следите за нашими новостями и развитием "простых" отчетов.


On-line comparison and selection services for Benjie X1

The automatic selection of the optimal AMP models from Benjie X1 .
from the measured power parameters of the amplifying part and the measured parameters of the headphones for different purpose of use.



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