Measurement's report Koss Porta Pro test and graphs - Reference Audio Analyzer

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Koss Porta Pro (report for a pro)



Test report - general data of Koss Porta Pro headphone

Frequency response, Impedance, Frequency response with standard AMPs


Graphics setting view
Frequency band, Hz:
Range, dB:

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


General results
General results Koss Porta Pro
Channel
Center/Summary
Sensitivity average in band from 100 Hz to 10 kHz, dB/V
117,5
Impedance average in band from 40 Hz to 15 kHz, ohm
72,2
For 94,0 dB SPL need, VRMS
0,067
For 94,0 dB SPL need, mW
0,061

The table shows a most important technical characteristics of Koss Porta Pro

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



Test conditions
  • Type of headphones: On-ear
  • Measurements were performed on the stand:
    • with on the simulator of human head with ears HDM-X with natural acoustic damping



Sensitivity of Koss Porta Pro headphone


Graphics setting view
Frequency band, Hz:
Channel:




Table of measured characteristics
Sensitivity Koss Porta Pro
Channel
Left
Right
Sensitivity average in band from 100 Hz to 10 kHz, dB/V
119,5
114,6
Sensitivity at 500 Hz at 1 V, dB
118,9
114,4
Sensitivity at 500 Hz at 1 mW, dB
106,7
102,2
Sensitivity at 1000 Hz at 1 V, dB
118,0
113,6
Sensitivity at 1000 Hz at 1 mW, dB
105,7
101,3

The sensitivity was calculated by data from the measuring stand HDM-X


Frequency response of Koss Porta Pro headphone


Graphics setting view
Frequency band, Hz:
Range, dB:
Channel:




Table of measured characteristics
Frequency response Koss Porta Pro
Channel
Left
Right
Variation in frequency response in band from 100 Hz to 10 kHz, dB
-20,76, 5,31
-8,71, 3,96

Impedance of Koss Porta Pro headphone


Graphics setting view
Frequency band, Hz:
Channel:




Table of measured characteristics
Impedance Koss Porta Pro
Channel
Left
Right
Impedance average in band from 40 Hz to 15 kHz, ohm
72,2
72,3
Resistance at 500 Hz, ohm
59,7
60,4
Resistance at 1000 Hz, ohm
58,6
58,9
The minimum value in band from 40 Hz to 15 kHz at frequency, Hz
1465,2
1321,3
The minimum value in band from 40 Hz to 15 kHz, ohm
58,5
58,8
The maximum value in band from 40 Hz to 15 kHz at frequency, Hz
93,1
99,8
The maximum value in band from 40 Hz to 15 kHz, ohm
159,7
153,9

Electric phase of Koss Porta Pro headphone


Graphics setting view
Frequency band, Hz:
Range, degree:
Channel:




Table of measured characteristics
Electric phase Koss Porta Pro
Channel
Left
Right
Average variation in phase response in band from 20 Hz to 20 kHz, degree
1,8
1,8
The minimum value in band from 20 Hz to 20 kHz at frequency, Hz
133,7
153,5
The minimum value in band from 20 Hz to 20 kHz, degree
-27,4
-26,1
The maximum value in band from 20 Hz to 20 kHz at frequency, Hz
66,0
69,5
The maximum value in band from 20 Hz to 20 kHz, degree
28,6
27,3

Frequency response of Koss Porta Pro headphone when connected to amplifiers with constant output impedance


Graphics setting view
Frequency band, Hz:
Range, dB:
Channel:




Table of measured characteristics
Frequency response of headphone Koss Porta Pro with amplifier with a constant impedance
Channel
Left
Right
Variation in FR from AMP 0 ohm in band 100 Hz to 10 kHz, dB
-20,76, +5,31
-8,71, +3,96
Variation in FR from AMP 10 ohm in band 100 Hz to 10 kHz, dB
-20,80, +5,29
-8,78, +4,04
Variation in FR from AMP 20 ohm in band 100 Hz to 10 kHz, dB
-20,83, +5,53
-8,84, +4,57
Variation in FR from AMP 50 ohm in band 100 Hz to 10 kHz, dB
-20,90, +6,80
-8,96, +5,71
Variation in FR from AMP 100 ohm in band 100 Hz to 10 kHz, dB
-20,97, +8,05
-9,08, +6,85
Variation in FR from AMP 300 ohm in band 100 Hz to 10 kHz, dB
-21,08, +9,92
-9,25, +8,58

Deviation of frequency response of Koss Porta Pro headphone when connected to amplifiers with constant output impedance


Graphics setting view
Frequency band, Hz:
Range, dB:
Channel:




Table of measured characteristics
Variation in frequency response with amplifiers with constant output resistance from Koss Porta Pro
Channel
Center/Summary
With amplifier impedance at 10 ohm in band 20 Hz to 20 kHz, dB
0,8
With amplifier impedance at 20 ohm in band 20 Hz to 20 kHz, dB
1,5
With amplifier impedance at 50 ohm in band 20 Hz to 20 kHz, dB
2,9
With amplifier impedance at 100 ohm in band 20 Hz to 20 kHz, dB
4,3
With amplifier impedance at 300 ohm in band 20 Hz to 20 kHz, dB
6,4

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


Frequency response of Koss Porta Pro headphone when connected to an amplifier with zero output impedance and raising of output impedanse in low frequencies


Graphics setting view
Frequency band, Hz:
Range, dB:
Channel:




Table of measured characteristics
Frequency response with an amplifier with zero output resistance and raising of output resistance in low frequencies from Koss Porta Pro
Channel
Left
Right
Variation in frequency response in band from 100 Hz to 10 kHz, dB
-20,72, 5,35
-8,67, 3,99

Deviation of frequency response of Koss Porta Pro headphone when connected to an amplifier with zero output impedance and raising of output impedanse in low frequencies


Graphics setting view
Frequency band, Hz:
Range, dB:
Channel:




Table of measured characteristics
Variance of frequency response Koss Porta Pro depending on the total output resistance of the amplifier with zero resistance and a rise of resistance at low frequencies
Variance frequency response at the frequency 20 Hz, dB
-3,1
Variance frequency response at the frequency 40 Hz, dB
-1,1
Variance frequency response at the frequency 80 Hz, dB
-0,2

Perception of headphone frequency response curves of equal loudness ISO 226-2009 of Koss Porta Pro headphone


Graphics setting view
Channel:




Table of measured characteristics
Perception of headphone frequency response curves of equal loudness ISO 226-2009 from Koss Porta Pro
Channel
Center/Summary
From level 48 dB at 72 dB SPL in band 100 Hz to 10 kHz, dB
-11,1, +15,9
From level 36 dB at 72 dB SPL in band 100 Hz to 10 kHz, dB
-10,5, +12,9
From level 24 dB at 72 dB SPL in band 100 Hz to 10 kHz, dB
-10,3, +9,8
From level 12 dB at 72 dB SPL in band 100 Hz to 10 kHz, dB
-10,5, +6,7
From level 0 dB at 72 dB SPL in band 100 Hz to 10 kHz, dB
-10,6, +4,1
From level -12 dB at 72 dB SPL in band 100 Hz to 10 kHz, dB
-10,7, +5,2
From level -24 dB at 72 dB SPL in band 100 Hz to 10 kHz, dB
-10,8, +6,2
From level -36 dB at 72 dB SPL in band 100 Hz to 10 kHz, dB
-10,9, +7,2

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


Impulse response of Koss Porta Pro headphone


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Time, ms:
Channel:



Impulse Response Envelope (ETC - Energy Time Curve) of Koss Porta Pro headphone


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Time, ms:
Range, dB:
Channel:



Step response of Koss Porta Pro headphone


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Time, ms:
Channel:





Square wave of Koss Porta Pro headphone

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