Reports / Earsonics / SM3v2

report for a pro
report for a newbie

EarSonic SM3v2 (Test report)

Test report - general data headphone EarSonic SM3v2

Frequency response, Impedance, Frequency response with standard AMPs

Report content

Sensitivity
Frequency response
Impedance
Electric phase
Frequency response of amplifier with constant output resistance
Variation in frequency response with amplifiers with constant output resistance
Frequency response with an amplifier with zero output resistance and raising of output resistance in low frequencies
Variation in frequency response an amplifier with zero output resistance with raising-up of output resistance in low frequencies
Perception of headphone frequency response curves of equal loudness ISO 226-2009
Impulse response
Step response
Impulse Response Envelope (ETC - Energy Time Curve)
QSD / Watterfall
Delta QSD / Delta Watterfall

Detailed measurements report of technical characteristics

Sensitivity headphone EarSonic SM3v2

Sensitivity EarSonic SM3v2

Channel

Left

Right

Sensitivity average in band from 100 Hz to 10 kHz, dB/V

131,1

Sensitivity at 500 Hz at 1 V, dB

134,7

134,4

Sensitivity at 500 Hz at 1 mW, dB

121,6

121,3

Sensitivity at 1000 Hz at 1 V, dB

131,8

131,5

Sensitivity at 1000 Hz at 1 mW, dB

121,4

121,1

The sensitivity was calculated by data from the measuring stand SIEC

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 V_RMS. 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. During the measurements, a special amplifier was used with zero total output impedance over the entire frequency range, which required no compensation for the amplitude response ^F.A.Q.. The microphone is calibrated to 45 kHz ^F.A.Q. with an appropriate frequency response correction.

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 feedback or select text and press Ctrl+Enter (anonymously).

Frequency response headphone EarSonic SM3v2

Frequency response EarSonic SM3v2

Channel

Left

Right

Variation in frequency response in band from 100 Hz to 10 kHz, dB

-11,16, 6,80

-9,43, 6,40

The RMS variation between the right and left channels
EarSonic SM3v2 from stand SIEC

Deviation between channels in band 40 Hz to 15 kHz, dB

0,4

Deviation between channels in low-frequency range 40 Hz to 200Гц, дБ

0,2

Deviation between channels in mid-frequency range 200 Hz to 2 kHz, dB

0,1

Deviation between channels in hi-frequency range 2 kHz 15 kHz, dB

0,6

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. During the measurements, a special amplifier was used with zero total output impedance over the entire frequency range, which required no compensation for the amplitude response ^F.A.Q.. The microphone is calibrated to 45 kHz ^F.A.Q. with an appropriate frequency response correction.

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 feedback or select text and press Ctrl+Enter (anonymously).

Impedance headphone EarSonic SM3v2

Impedance EarSonic SM3v2

Channel

Left

Right

Impedance average in band from 40 Hz to 15 kHz, ohm

45,7

45,5

Resistance at 500 Hz, ohm

49,0

48,9

Resistance at 1000 Hz, ohm

91,7

89,7

The minimum value in band from 40 Hz to 15 kHz at frequency, Hz

10259,7

10084,5

The minimum value in band from 40 Hz to 15 kHz, ohm

18,2

18,1

The maximum value in band from 40 Hz to 15 kHz at frequency, Hz

1321,3

1344,3

The maximum value in band from 40 Hz to 15 kHz, ohm

109,7

107,7

Electric phase headphone EarSonic SM3v2

Electric phase EarSonic SM3v2

Channel

Left

Right

Average variation in phase response in band from 20 Hz to 20 kHz, degree

5,4

5,5

The minimum value in band from 20 Hz to 20 kHz at frequency, Hz

5241,0

2032,4

The minimum value in band from 20 Hz to 20 kHz, degree

-38,2

-37,9

The maximum value in band from 20 Hz to 20 kHz at frequency, Hz

19741,4

The maximum value in band from 20 Hz to 20 kHz, degree

50,5

51,4

Frequency response of amplifier with constant output resistance from headphone EarSonic SM3v2

Variation in frequency response with amplifiers with constant output resistance from headphone EarSonic SM3v2

Frequency response with an amplifier with zero output resistance and raising of output resistance in low frequencies from headphone EarSonic SM3v2

Variation in frequency response an amplifier with zero output resistance with raising-up of output resistance in low frequencies from headphone EarSonic SM3v2

Perception of headphone frequency response curves of equal loudness ISO 226-2009 from headphone EarSonic SM3v2

Perception of headphone frequency response curves of equal loudness ISO 226-2009 from EarSonic SM3v2

Channel

Summary (Right + Left)

From level 48 dB at 72 dB SPL in band 100 Hz to 10 kHz, dB

-13,0, +18,8

From level 36 dB at 72 dB SPL in band 100 Hz to 10 kHz, dB

-12,3, +15,7

From level 24 dB at 72 dB SPL in band 100 Hz to 10 kHz, dB

-11,6, +12,6

From level 12 dB at 72 dB SPL in band 100 Hz to 10 kHz, dB

-10,9, +9,6

From level 0 dB at 72 dB SPL in band 100 Hz to 10 kHz, dB

-10,2, +6,5

From level -12 dB at 72 dB SPL in band 100 Hz to 10 kHz, dB

-9,6, +4,5

From level -24 dB at 72 dB SPL in band 100 Hz to 10 kHz, dB

-9,0, +3,6

From level -36 dB at 72 dB SPL in band 100 Hz to 10 kHz, dB

-8,5, +3,4

*Center channel is received by data averaging between the left and right channels

Brief information

The graph shows the change in the perception of the frequency response^F.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 feedback or select text and press Ctrl+Enter (anonymously).

Impulse response headphone EarSonic SM3v2

Brief information

Impulse response is a reaction to the pulse of the minimum possible duration. From the impulse response, most of the parameters under study are calculated: frequency response ^F.A.Q., phase-frequency response, group delay, waterfall, step response and square wave. The impulse response is visually not informative and for obtaining the majority of characteristics a fast Fourier transform and other mathematical algorithms with the analysis of the total pulse length are used. The total pulse length is about 5 seconds, while only the beginning of a pulse of 2-4 milliseconds is visually visible. Vertically, the visual detail does not exceed 40-45 dB.

The impulse response is able to show visually only the same or different polarity of the drivers and possible high-frequency resonance.

The waveform of the impulse response of the Earsonics SM3v2 depends on the Earsonics SM3v2 frequency response and the damped resonances and reverberations of the Astrotec AX-60 and the reverberation in the stand chamber. The visual clarity of the parameters on the impulse response is very low. Visual determination of quality by impulse response was actual in "pre-computer" years.

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. During the measurements, a special amplifier was used with zero total output impedance over the entire frequency range, which required no compensation for the amplitude response ^F.A.Q.. The microphone is calibrated to 45 kHz ^F.A.Q. with an appropriate frequency response correction. RAA measurements are made in 192 kHz / 24 bit mode. The impulse response is displayed as is, without compensation of the frequency response for the microphone or smoothing. It is RAW data. The reduction in the frequency response of the microphone starts at 20 kHz^F.A.Q.. When reproducing the test signal via the E-MU 1616m , the original impulse response does not contain any pre-ringing ^F.A.Q.. Translation of the description is not yet ready

Original text in Russian report. You can help with translation via the feedback or select text and press Ctrl+Enter (anonymously).

Impulse Response Envelope (ETC - Energy Time Curve) headphone EarSonic SM3v2

Step response headphone EarSonic SM3v2

Brief information

The step response is a playback on a step (front square) signal. It is built on the derivative impulse response .The response to the step represents the beginning of the meander front with zero frequency.

In the audiophile community on the square wave it is customary to determine the "speed" of the headphones, however this characteristic is applicable only to amplifiers having a flat frequency response with no reverberation and completely not applicable to headphones.

The waveform of the response to the step depends on the frequency response and the resonances of the headphones. In ancient times, before the wide spread of digital technologies, in the form of a meander, a rough estimate was made on the frequency response ^F.A.Q. and F.A.Q.. Today, the analysis of acoustic parameters on the meander is hopelessly outdated and the graphs of the final frequency response and waferballs with resonances are looked at separately.

Original text in Russian report. You can help with translation via the feedback or select text and press Ctrl+Enter (anonymously).

QSD / Watterfall headphone EarSonic SM3v2

Brief information

The cumulative spectrum of the signal attenuation shows resonances and reverberations after the headphones cease to reproduce the signal.

The cumulative spectrum ^F.A.Q. of signal attenuation is constructed by impulse response .The graph does not use three-wave smoothing. Time zones with an interval of 1 ms are painted in a certain color. For convenience of perception, the graph does not have vertical displacement, limited only to horizontal displacement. From the position of 3D - this is a view with a small turn in the horizontal plane. You can accurately assess the level on a vertical scale. To obtain good resolution in the time domain, a small window of 2048 samples is used, which directly affects the low resolution of the low frequency region and the graph in the region below 200-300 Hz does not show useful information.

Original text in Russian report. You can help with translation via the feedback or select text and press Ctrl+Enter (anonymously).

Delta QSD / Delta Watterfall headphone EarSonic SM3v2

Brief information

The change in the cumulative spectrum ^F.A.Q. of the signal attenuation is a cumulative spectrum of the signal attenuation, where the original frequency response is represented by a straight line.

Time zones are painted in a certain color.

Sharp peaks above 0 dB are formed in the presence of a narrow-band dip at the initial frequency response. This can be a resonance or an error in the interference of waves, it needs to die according to the graph of cumulative spectrum signal attenuation.

For the convenience of estimating the amplitudes, the graph has no vertical and horizontal displacement.

To obtain good resolution in the time domain, a small window of 2048 samples is used, which directly affects the low resolution of the low frequency region and the graph in the region below 200-300 Hz does not show useful information.

Original text in Russian report. You can help with translation via the feedback or select text and press Ctrl+Enter (anonymously).

What is the cumulative signal attenuation spectrum? How do headphone resonances affect sound?

More detailed

Measurements of Earsonics SM3v2 were carried out by Roman Kuznetsov on the hardware-software complex RAA.

The Earsonics SM3v2 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

Information for Authors. You can freely use the graphics in your articles with a link to us.

Comments

No comments to Earsonics SM3v2

Want to leave a comment or ask a question? Register now or log in

EarSonic SM3v2 (Test report)

Test report - general data headphone EarSonic SM3v2

Frequency response, Impedance, Frequency response with standard AMPs

Test conditions

Report content

Detailed measurements report of technical characteristics

Sensitivity headphone EarSonic SM3v2

Frequency response headphone EarSonic SM3v2

Impedance headphone EarSonic SM3v2

Electric phase headphone EarSonic SM3v2

Frequency response of amplifier with constant output resistance from headphone EarSonic SM3v2

Variation in frequency response with amplifiers with constant output resistance from headphone EarSonic SM3v2

Frequency response with an amplifier with zero output resistance and raising of output resistance in low frequencies from headphone EarSonic SM3v2

Variation in frequency response an amplifier with zero output resistance with raising-up of output resistance in low frequencies from headphone EarSonic SM3v2

Perception of headphone frequency response curves of equal loudness ISO 226-2009 from headphone EarSonic SM3v2

Impulse response headphone EarSonic SM3v2

Impulse Response Envelope (ETC - Energy Time Curve) headphone EarSonic SM3v2

Step response headphone EarSonic SM3v2

QSD / Watterfall headphone EarSonic SM3v2

Delta QSD / Delta Watterfall headphone EarSonic SM3v2

Comments