HiFiMan HE-400



Reports / HiFiMan / HE-400 / report for a newbie

HiFiMan HE-400 (report for a newbie)

General results HiFiMan HE-400

  • Sensitivity F.A.Q. by voltage: 108.57 dB/V SPL
  • Sensitivity F.A.Q. by power: 94.88 dB/mW SPL
  • Average impedance : 42.74 ohm
  • The type of acoustic design: Open
  • Headphone: Mid-impedance
  • Type of headphones: Over-ear

Analysis with recommendations for HiFiMan HE-400 headphones based on the measured characteristics

Analysis and recommendations for HiFiMan HE-400 based on the measured characteristics
Sources
(what the headphones to be connected)
Areas of using headphones Sensitivity Impedance The type of acoustic design Total
108.57 dB/V SPL 42.74 ohm Open  
Low-power sources -6dBV/15dB(mA):

a smartphone
a player
a tablet
Examples
Home or studio, where sound from the headphones does not bother anyone 4
★★★★☆
3
★★★☆☆
5
★★★★★
4.0
★★★★☆
Office and home, where people should not hear the sound from the headphones 4
★★★★☆
3
★★★☆☆
1
★☆☆☆☆
2.7
★★☆☆☆
Street with active traffic 3
★★★☆☆
2
★★☆☆☆
5
★★★★★
3.3
★★★☆☆
Metro (subway), public transport 2
★★☆☆☆
1
★☆☆☆☆
1
★☆☆☆☆
1.3
★☆☆☆☆
Mid-power sources 6dBV/27dB(mA):
a computer with sound card
a Hi-Fi player
a portable amplifier
a mixing console
Examples
Home or studio, where sound from the headphones does not bother anyone 5
★★★★★
5
★★★★★
5
★★★★★
5.0
★★★★★
Metro (subway), public transport 4
★★★★☆
3
★★★☆☆
1
★☆☆☆☆
2.7
★★☆☆☆
Recording a voice or instrument in the studio 5
★★★★★
4
★★★★☆
1
★☆☆☆☆
3.3
★★★☆☆
Hi-power sources 18dBV:

a home system with a headphone amplifier
Examples
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
★★★☆☆


Analysis of acoustic design HiFiMan HE-400

The HiFiMan HE-400 headphones are made with an acoustic design of an open type.

Due to the open type, the headphones do not have noise isolation - the surrounding people hear the music from the headphones well, and the listener can hear ambient sounds.

Headphones without noise isolation are well suited for home and studio in a quiet environment, as well as on the street with active traffic, allowing you to notice the danger in time.

Headphones without noise isolation are unsuitable for use in noisy public transport - due to external noise it is necessary to increase the volume level of reproduced music, which is harmful for hearing during long listening. Loud sound is unpleasant to passengers nearby. In a studio, while recording vocals or instruments by a microphone, the open headphones are likewise not suitable, because sound from the "minus" from the headphones will fall into the microphone.

Analysis of the sensitivity of HiFiMan HE-400 headphones


The sensitivity of the HiFiMan HE-400 headphones is 108.57 dB/V SPL by the voltage and 94.88 dB/mW SPL by the power. The sensitivity by voltage reflects the relative "loudness" of the headphones among others - the higher the value, so the headphones are louder. The sensitivity by power reflects the efficiency of the headphones. High sensitivity of the headphones means less energy need from the source (for portable devices - less battery power).

Depending on the sensitivity, headphones are best to use with sources of optimum power. If the source is too powerful, then there is a high probability of constantly hearing background noise. If source power is weak, there will be insufficient volume level.

In a quiet environment for the HiFiMan HE-400 , an amplifier with a voltage level of at least 1.43 dBV at 43 Ohms is recommended for listening to music with a level of 90 dB SPL (without noise isolation). An amplifier with a level above 39.43 dBV is not desirable if the volume control is digital, not analog.

For noisy environments, an amplifier with a voltage level of at least 13.43 dBV at a load of 42.74 ohms is desirable.


If you want to listen to music at a different volume level, you just need to add or subtract a change in dB to 90 dB SPL (for example, for a desired level of 105 dB SPL, add 15 dB and the minimum voltage level for the amplifier is 1.43 dBV + 15 dB = 16.43 dBV).


Analysis of the impedance of HiFiMan HE-400 headphones

The average resistance at the headphones HiFiMan HE-400 is 42.74 Ohm.

The resistance affects the amount of current that the amplifier should give to the headphones. If the current is not enough, the sound quality will deteriorate, beginning with harsh in the sound and ending with a banal rattling. In most cases, at low current values, the amplifiers operate in comparable quality to class A, and as the current level rises, the quality decreases toward AB, B, and the clipping zone.

Imagine that you have a water tank, which gradually becomes filled with water. The voltage at the amplifier, this pressure, with which the pump pumped water from the reservoir. If the inflow of water in the tank is lower than the volume that the pump pumps out, then at the pump outlet we collect water and "bubbles". Similarly, with the sound from the headphones, which lacked current from the amplifier.

For a quiet environment, an amplifier with an output current level of at least 27.57 mA in a given class of quality is desirable (preferably orientated to comparable class A) and 109.76 mA for loud.





Analysis of other measured characteristics for HiFiMan HE-400

We prepare automatic analysis with comments of other characteristics and graphs, such as: Follow our news.


On-line comparison and selection services for HiFiMan HE-400

Comparison the frequency response HiFiMan HE-400 versus other models

Compare the sensitivity and impedance HiFiMan HE-400 versus other models.

The automatic selection of the optimal AMP models from HiFiMan HE-400 from the measured power parameters of the amplifying part and the measured parameters of the headphones for different purpose of use.

Сравнение АЧХ и звукового давления HiFiMan HE-400 в зависимости от подаваемого напряжения и импеданса усилителя.

Измерения HiFiMan HE-400 проведены Романом Кузнецовым на программно-аппаратном комплексе RAA.

Тест HiFiMan HE-400 проведен как черного ящика, без учета стоимости и престижа. Это главный принцип измерений и разработки тестов в RAA.

Считаю, что важно делать не абсолютную оценку устройства, а совокупную оценку при совместной работе сусилителем источника и учетом внешних факторов. Это позволяет эффективно раскрывать потенциал всей связки устройств или делать более оптимальный подбор компонентов.




Kuznetsov Roman
Founder of RAA



Known by the nickname romanrex
Аuthor of articles iXBT.com



Last news




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