AKG K 172 HD - Test report a newbie-dummies Reference Audio Analyzer

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AKG K 172 HD (report for a newbie)

General results AKG K 172 HD

  • Sensitivity by voltage: 95.24 dB/V SPL
  • Sensitivity by power: 84.01 dB/mW SPL
  • Average impedance : 75.29 ohm
  • The type of acoustic design: Closed
  • Headphone: Mid-impedance
  • Type of headphones: Over-ear

Analysis with recommendations for AKG K 172 HD headphones based on the measured characteristics

Analysis and recommendations for AKG K 172 HD 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
95.24 dB/V SPL 75.29 ohm Closed  
Low-power sources -18dBV/6dB(mA), S/N 105 dB:

a smartphone
a player
a tablet
Examples
Home or studio, where sound from the headphones does not bother anyone 1
★☆☆☆☆
3
★★★☆☆
1
★☆☆☆☆
1.7
★☆☆☆☆
Office and home, where people should not hear the sound from the headphones 1
★☆☆☆☆
3
★★★☆☆
5
★★★★★
3.0
★★★☆☆
Street with active traffic 1
★☆☆☆☆
2
★★☆☆☆
1
★☆☆☆☆
1.3
★☆☆☆☆
Metro (subway), public transport 1
★☆☆☆☆
1
★☆☆☆☆
5
★★★★★
2.3
★★☆☆☆
Mid-power sources 6dBV/30dB(mA), S/N 120 dB:
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 4
★★★★☆
5
★★★★★
1
★☆☆☆☆
3.3
★★★☆☆
Metro (subway), public transport 2
★★☆☆☆
5
★★★★★
5
★★★★★
4.0
★★★★☆
Recording a voice or instrument in the studio 3
★★★☆☆
5
★★★★★
5
★★★★★
4.3
★★★★☆
Hi-power sources 18dBV, S/N 120 dB:

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




Analysis of acoustic design AKG K 172 HD

The AKG K 172 HD headphones are made with closed-type acoustic design.

Due to the closed type the headphones have passive noise isolation and for the surrounding public the headphones play much quiet than for the listener. External sounds for the listener is on the same quiet level.

Headphones with noise isolation are good for home, when you need not to disturb others while listening to music. It's good in a noisy office, allowing you not to be distracted. In noisy transport playing music in such headphones is more safe for hearing, because due to noise isolation it is possible to listen to music at an average or quiet volume. In the studio, when recording vocals or instruments on a microphone, the closed headphones fit best; Sound from the "minus" of the headphones will not get into the microphone.

Headphones with noise isolation are dangerous to use on the street with active traffic.





Analysis of the sensitivity of AKG K 172 HD headphones


The sensitivity of the AKG K 172 HD headphones is 95.24 dB/V SPL by the voltage and 84.01 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 AKG K 172 HD, an amplifier with a voltage level of at least 8.76 dBV at 75 Ohms is recommended for listening to music with a level of 90 dB SPL (without noise isolation). An amplifier with a level above 46.76 dBV is not desirable if the volume control is digital, not analog.

For noisy environments, an amplifier with a voltage level of at least 20.76 dBV at a load of 75.29 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 8.76 dBV + 15 dB = 23.76 dBV).






Analysis of the impedance of AKG K 172 HD headphones

The average resistance at the headphones AKG K 172 HD is 75.29 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 36.42 mA in a given class of quality is desirable (preferably orientated to comparable class A) and 144.98 mA for loud.





On-line comparison and selection services for AKG K 172 HD

Comparison of basic characteristics: Sensitivity, Impedance.

Determination of the required voltage level from a headphone amplifier for K 172 HD and comparison with other models A additional analytics of compatibility with specific amplifiers.

The automatic selection of the optimal AMP models from K 172 HD.


Close

Measurements of AKG K 172 HD were carried out by Roman Kuznetsov on the hardware-software complex RAA.

The AKG K 172 HD 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 source amplifier 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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