About this report
This is a headphone report for professionals.
You can see a simple report for "dummies" with explanations of the main characteristics for Apple AirPods
One device can have multiple reports in different modes and with different a suite of tests.
Test report - general data of Apple AirPods headphone
Perception of headphone frequency response curves of equal loudness ISO 226-2009
General results
General results Apple AirPods
Channel
Center/Summary
Variation in frequency response in band from 100 Hz to 0,01 kHz, dB
-7,07, 13,89
The table shows a most important technical characteristics of Apple AirPods
*Center channel headphone is received by averaging between left and right channels
*impedance value in the table for channel
Test conditions
- Type of headphones: In-Ear or Tablet
- Measurements were performed on the stand:
- with on the simulator of human head with ears HDM-X with natural acoustic damping
- Headphone's impedance has not been tested
- The model use internal headphone amplifier
- Can be used only with special AMP
- By other reason
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Detailed measurements report of technical characteristics
Report content
Graphics setting view
Channel:
Brief information
The sensitivity of the headphones F.A.Q. is determined by the amplitude-frequency response curve F.A.Q. with the specified sound pressure dB SPL of 1 VRMS. For 0 dB, 20 μPa is assumed.
By the sensitivity of the headphones, you can predict the volume level developed by the headphones at any chosen frequency with the known supply voltage to the headphones from the amplifier. Three-wave smoothing F.A.Q. is used to eliminate the interference of waves due to the use of a "point" microphone.
The frequency response in RAA is obtained through the reproduction and analysis of a special noise signal with the subsequent generation of an impulse response. The frequency response plot is constructed from the spectrum of the impulse response.
The difference in amplitudes of 6 dB is equivalent to a twofold ratio of signal levels.
Original text in Russian report. You can help with translation via the forum or feedback.
Table
Sensitivity Apple AirPods
Channel
Left
Right
Sensitivity average in band from 100 Hz to 10 kHz, dB/V
125,2
122,0
Sensitivity at 500 Hz at 1 V, dB
118,6
115,7
Sensitivity at 500 Hz at 1 mW, dB
-бесконечность
-бесконечность
Sensitivity at 1000 Hz at 1 V, dB
121,9
117,6
Sensitivity at 1000 Hz at 1 mW, dB
-бесконечность
-бесконечность
The sensitivity was calculated by data from the measuring stand HDM-X
Comparison of the parameters by on-line services
Compare the frequency response of headphones with sensitivity
How much sensitivity of the Apple AirPods different from other models? Comparison the frequency response with sensitivity graph of Apple AirPods on-line.
Comparison of change of SPL and frequency response of headphones depending on the applied voltage level and the impedance of the audio source
Comparison of change of SPL and frequency response of Apple AirPods depending on the applied voltage level and the impedance of the audio source by on-line service.
Comparison of the sensitivity value Apple AirPods versus other models
How much are the characteristics of Apple AirPods different from other models?
This can be compared for all measured headphone models
Determination of the required voltage level from the headphone amplifier and comparison with other models
What voltage range from the amplifier is needed for the Apple AirPods?
Comparison of on-line graphs with additional analytics of compatibility with specific amplifiers. In comparison, the required voltage value, which the amplifier should provide for the selected sound pressure, is determined based on the sensitivity value of the Apple AirPods.
Graphics setting view
Range, dB:
Channel:
Brief information
Graph of frequency response F.A.Q. the shows the balance of the frequency of the headphones (reproduced frequency spectrum) in dB. 0 dB is the average of the amplitude.
The frequency response of the headphones can be represented as the selected equalizer setting in the player, applicable to headphones with a flat sound. Subjective "flatness" is perceived differently from external conditions: the volume level F.A.Q. of the external noise and noise isolation headphones. When connected to an amplifier, the frequency response can change F.A.Q..
The frequency response in RAA is obtained through the reproduction and analysis of a special noise signal with the subsequent generation of an impulse response. The frequency response plot is constructed from the spectrum of the impulse response.
According to the frequency response curve, it is possible to calculate the width of the frequency range F.A.Q..
The difference in amplitudes of 6 dB is equivalent to a twofold ratio of signal levels.
Original text in Russian report. You can help with translation via the forum or feedback.
Table
Frequency response Apple AirPods
Channel
Left
Right
Variation in frequency response in band from 100 Hz to 10 kHz, dB
-7,42, 14,12
-6,55, 14,17
Comparison of the parameters by on-line services
Comparison the frequency response of Apple AirPods versus other models
How much frequency response of the Apple AirPods different from other models? Comparison the frequency response of
Perception of headphone frequency response curves of equal loudness ISO 226-2009 of Apple AirPods headphone
Graphics setting view
Channel:
Brief information
Brief information
The graph shows the change in the perception of the frequency responseF.A.Q. of the headphones when listening to music with a different loudness relative to the natural level. When listening to headphones at a low volume, the perception of recoil in the low frequency range decreases, and when you listen to it at a high volume, it increases.
According to this graph, you can estimate at what volume the headphones will be perceived more flat.
The perception of the number of low frequencies depends on the volume according to the curves of equal loudness. (ISO 226-2009 Acoustics. Normal equal-loudness-level contours). For the base level, 72 dB SPL (live performance of several instruments with vocals without amplifiers with acoustics) is selected.When you select another base level, the dependence varies slightly and is suitable for almost all levels.
Examples of graphics application in practice F.A.Q..
Original text in Russian report. You can help with translation via the forum or feedback.
Table
Perception of headphone frequency response curves of equal loudness ISO 226-2009 from Apple AirPods
Channel
Center/Summary
From level 48 dB at 72 dB SPL in band 100 Hz to 10 kHz, dB
-7,9, +9,6
From level 36 dB at 72 dB SPL in band 100 Hz to 10 kHz, dB
-7,3, +10,6
From level 24 dB at 72 dB SPL in band 100 Hz to 10 kHz, dB
-6,9, +11,7
From level 12 dB at 72 dB SPL in band 100 Hz to 10 kHz, dB
-6,6, +12,8
From level 0 dB at 72 dB SPL in band 100 Hz to 10 kHz, dB
-7,1, +13,9
From level -12 dB at 72 dB SPL in band 100 Hz to 10 kHz, dB
-10,0, +14,9
From level -24 dB at 72 dB SPL in band 100 Hz to 10 kHz, dB
-12,9, +16,0
From level -36 dB at 72 dB SPL in band 100 Hz to 10 kHz, dB
-15,7, +16,9
*Center channel is received by data averaging between the left and right channels
