Yamaha RH-5Ma - Test report a newbie-dummies Reference Audio Analyzer

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Yamaha RH-5Ma (report for a newbie)

General results Yamaha RH-5Ma

  • Sensitivity F.A.Q. by voltage: 115.75 dB/V SPL
  • Sensitivity F.A.Q. by power: 101.01 dB/mW SPL
  • Average impedance : 33.55 ohm
  • The type of acoustic design: Semi-open
  • Headphone: Low-impedance
  • Type of headphones: Over-ear

Analysis with recommendations for Yamaha RH-5Ma headphones based on the measured characteristics

Analysis and recommendations for Yamaha RH-5Ma 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
115.75 dB/V SPL 33.55 ohm Semi-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 5
★★★★★
5
★★★★★
3
★★★☆☆
4.3
★★★★☆
Office and home, where people should not hear the sound from the headphones 5
★★★★★
5
★★★★★
3
★★★☆☆
4.3
★★★★☆
Street with active traffic 5
★★★★★
4
★★★★☆
3
★★★☆☆
4.0
★★★★☆
Metro (subway), public transport 4
★★★★☆
3
★★★☆☆
3
★★★☆☆
3.3
★★★☆☆
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
★★★★★
3
★★★☆☆
4.3
★★★★☆
Metro (subway), public transport 5
★★★★★
5
★★★★★
3
★★★☆☆
4.3
★★★★☆
Recording a voice or instrument in the studio 5
★★★★★
5
★★★★★
3
★★★☆☆
4.3
★★★★☆
Hi-power sources 18dBV:

a home system with a headphone amplifier
Examples
Home or studio, where sound from the headphones does not bother anyone 4
★★★★☆
5
★★★★★
3
★★★☆☆
4.0
★★★★☆
Office and home, where people should not hear the sound from the headphones 4
★★★★☆
5
★★★★★
3
★★★☆☆
4.0
★★★★☆


Analysis of acoustic design Yamaha RH-5Ma

The Yamaha RH-5Ma headphones are made with semi-closed acoustic design.

Due to the semi-closed type, the headphones have a partial passive noise isolation and for the surrounding the headphones play more quietly than for the listener. Sounds around the listener similarly perceive quietly.

For all possible situations, headphones with partial noise insulation are not too bad and not good enough compared to headphones of an open and closed type. This type of headphone is usually a compromise. In one price category, usually open headphones sound better than closed type and semi-closed headphones allow you to get quality higher than in closed ones for a similar price.

Semi-closed headphones are good only for home, when noise insulation is not important. In a noisy office, these headphones do not sufficiently silence the ambient noise and music from the headphones can interfere with colleagues. In noisy transport, these headphones will have to listen to music at a higher volume than in closed-type headphones. In the studio, when recording a vocal or instrument, the sound from the "minus" from the headphones will go into the microphone. Headphones with a partial noise isolation similar to an open-type headphone is dangerous to use on the street with active traffic.

Analysis of the sensitivity of Yamaha RH-5Ma headphones


The sensitivity of the Yamaha RH-5Ma headphones is 115.75 dB/V SPL by the voltage and 101.01 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 Yamaha RH-5Ma, an amplifier with a voltage level of at least -8.75 dBV at 34 Ohms is recommended for listening to music with a level of 90 dB SPL (without noise isolation). An amplifier with a level above 29.25 dBV is not desirable if the volume control is digital, not analog.

For noisy environments, an amplifier with a voltage level of at least 3.25 dBV at a load of 33.55 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 -8.75 dBV + 15 dB = 6.25 dBV).


Analysis of the impedance of Yamaha RH-5Ma headphones

The average resistance at the headphones Yamaha RH-5Ma is 33.55 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 10.88 mA in a given class of quality is desirable (preferably orientated to comparable class A) and 43.31 mA for loud.


Sensitivity

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The average value of sensitivity by voltage for Over-ear headphones by measured 411 models is 111.9 dB/V SPL.

The Yamaha RH-5Ma sensitivity is 115.8 dB/V SPL.

These headphones are 3.9 dB louder than most Over-ear headphones.This difference is insignificant and not exceeding a threefold deviation from the mean. So, most devices designed to work with full-sized headphones should fit quite well with the Yamaha RH-5Ma. A sufficient volume should be provided during playback and background noise from the source should not be noticeable.

In general, to listen to music with a level of 90 dB SPL in a quiet environment, the amplifier will require a voltage of -5.8 dBV.

It is desirable that the amplifier provides a margin of 12 dB in cases of rare noisy environments or for too quiet recordings. Thus, the amplifier should provide a maximum voltage level not lower than 6.2 dBV.

Excessive volume margin is undesirable, since for analog regulator, the adjustment range is about 40 dB and below that the channels imbalance begins. For a discrete regulator the pitch may be too large. For digital controllers are possible options for adjusting the sound level before a DAC or in a DAC. As a result of that will be decrease the signal-to-noise ratio and accordingly it is probable the appearance of audible noise.

The average sensitivity to power for Over-ear headphones is 99.1 dB/mW SPL (average by measured 411 headphone models). The Audeze LCD-2C sensitivity is 101.0 dB / mW SPL. Yamaha RH-5Ma have greater sensitivity than other headphones of this type. This means that their power consumption is lower and being connected to mobile devices, the operation time of this bundle will be longer than of many others.


On-line comparison and selection services for Yamaha RH-5Ma

Comparison the frequency response Yamaha RH-5Ma versus other models

Compare the sensitivity and impedance Yamaha RH-5Ma versus other models.

The automatic selection of the optimal AMP models from Yamaha RH-5Ma 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 Yamaha RH-5Ma в зависимости от подаваемого напряжения и импеданса усилителя.
Close

Measurements of Yamaha RH-5Ma were carried out by Roman Kuznetsov on the hardware-software complex RAA.

The Yamaha RH-5Ma 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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