Ultrasone HFI 2400 - Test report a newbie-dummies Reference Audio Analyzer

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Reports / Ultrasone / HFI 2400 / report for a newbie

Ultrasone HFI 2400 (report for a newbie)

General results Ultrasone HFI 2400

  • Sensitivity F.A.Q. by voltage: 106.22 dB/V SPL
  • Sensitivity F.A.Q. by power: 95.33 dB/mW SPL
  • Average impedance : 81.47 ohm
  • The type of acoustic design: Open
  • Headphone: Mid-impedance
  • Type of headphones: Over-ear

Analysis with recommendations for Ultrasone HFI 2400 headphones based on the measured characteristics

Analysis and recommendations for Ultrasone HFI 2400 based on the measured characteristics
Sources
(to which the headphones will be connected)
Areas of using headphones Sensitivity Impedance The type of acoustic design Total
106.22 dB/V SPL 81.47 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
★★★★☆
4
★★★★☆
5
★★★★★
4.3
★★★★☆
Office and home, where people should not hear the sound from the headphones 4
★★★★☆
4
★★★★☆
1
★☆☆☆☆
3.0
★★★☆☆
Street with active traffic 3
★★★☆☆
3
★★★☆☆
5
★★★★★
3.7
★★★☆☆
Metro (subway), public transport 2
★★☆☆☆
2
★★☆☆☆
1
★☆☆☆☆
1.7
★☆☆☆☆
Mid-power sources 6dBV/27dB(mA):
a computer with sound card
a Hi-Fi player
a portable amplifier
a mixer console
Examples
Home or studio, where sound from the headphones does not bother anyone 5
★★★★★
5
★★★★★
5
★★★★★
5.0
★★★★★
Metro (subway), public transport 4
★★★★☆
4
★★★★☆
1
★☆☆☆☆
3.0
★★★☆☆
Recording a voice or instrument in the studio 5
★★★★★
5
★★★★★
1
★☆☆☆☆
3.7
★★★☆☆
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 Ultrasone HFI 2400

The Ultrasone HFI 2400 headphones are made with an acoustic design of an open type.

Due to the open type, the headphones do not have noise isolation - the people around can hear well the music from the headphones, while you can hear ambient sounds too.

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, as 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 gets into the microphone.

Analysis of the sensitivity of Ultrasone HFI 2400 headphones


The sensitivity of the Ultrasone HFI 2400 headphones is 106.22 dB/V SPL by the voltage and 95.33 dB/mW SPL by the power. The sensitivity by voltage reflects the relative "loudness" of the headphones among others - the higher is the value, the louder are the headphones. 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 power from the battery).

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 Ultrasone HFI 2400, an amplifier with a voltage level of at least 3.78 dBV at 81 Ohms is recommended for listening to music with a level of 90 dB SPL (without noise isolation). An amplifier with a level above 41.78 dBV is not desirable if the volume control is digital, not analog.

For noisy environments, an amplifier with a voltage level of at least 15.78 dBV at a load of 81.47 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 3.78 dBV + 15 dB = 18.78 dBV).


Analysis of the impedance of Ultrasone HFI 2400 headphones

The average resistance at the headphones Ultrasone HFI 2400 is 81.47 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 crackling. 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 fills with water. The voltage from the amplifier this is the pressure with which the pump draws 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 will be with the sound from the headphones, which are lacked the current from the amplifier.

For a quiet environment, an amplifier with an output current level of at least 18.97 mA in a given class of quality is desirable (preferably orientated to comparable class A) and 75.51 mA for loud.



On-line comparison and selection services for Ultrasone HFI 2400

Comparison the frequency response.
The Ultrasone HFI 2400 was tested for a long time at the stands of the last generation and does not participate in comparison. If possible, we will re-test the Ultrasone HFI 2400 on modern stands.
Compare the frequency response of a bundle of headphones and amplifiers.
The Ultrasone HFI 2400 was tested for a long time at the stands of the last generation and does not participate in comparison. If possible, we will re-test the Ultrasone HFI 2400 on modern stands.

Compare the sensitivity and impedance Ultrasone HFI 2400 versus other models.

The automatic selection of the optimal AMP models from Ultrasone HFI 2400 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 Ultrasone HFI 2400 в зависимости от подаваемого напряжения и импеданса усилителя.
Close

Measurements of Ultrasone HFI 2400 were carried out by Roman Kuznetsov on the hardware-software complex RAA.

The Ultrasone HFI 2400 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.



Kuznetsov Roman
Founder of RAA



Known by the nickname romanrex
Аuthor of articles iXBT.com




Ultrasone HFI 2400 is available in reports and services. You are in a simple report.

Service and suite of tests

Information for all

Comparison of on-line graphs

Information for professionals

report for a pro

Comparison of on-line graphs




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