Reference Audio Analyzer


Power and Sensitivity: Shanling M2s + Sennheiser HD 25-C II




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Parameters for displaying the graphics of the amplifier/s
Graph Display Type

The initial coordinates for plotting

Optimal range of volume control
Correction for the energy density of a musical signal




Parameters of the axis of the graph
- Loaded impedance headphones, ohm

- Range of Voltage, dBV




Headphone Graph Display Options
Show data from headphone settings


Sensitivity

Desired SPL sound pressure level when listening to music

Peak factor in the unevenness of the music volume




Custom AMP
View


Name

dBV

dB(mA)

ohm





Characteristics of the amplifier part from Shanling M2s

Output Impedance 4.62 ohm
Power characteristics of the Voltage Current
VRMS dBV mA dB(mA)
Equivalent class A F.A.Q. 1.83 5.24 41.40 32.34
Equivalent class AB F.A.Q. 2.05 6.24 88.51 38.94
Equivalent class B F.A.Q. 2.05 6.24 88.51 38.94
Maximum mode F.A.Q. 2.05 6.24 88.51 38.94

Characteristics of the selected headphones

Delete Close Name Sensitivity of voltage , dB/V SPL Impedance , ohm Reports
Sennheiser HD 25-C II 114.8 69.8





Headphones



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Headphone amplifiers



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Maximum level of the load

Loaded impedance headphones ohm

Equivalent power class F.A.Q. A AB B Max NCL
dBV dBV dBV dBV dBV
Shanling M2s 4.1 5.1 5.1 5.1 5.1





About maximum voltage levels of the load
To compare the amplifiers for loudness from the impedance, set the required impedance value.

Why is the "volume" expressed in dBV
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.


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