Measurement's report Koss Porta Pro - Reference Audio Analyzer

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Koss Porta Pro (report for a pro)

Test report - general data Koss Porta Pro headphone

Frequency response, Impedance, Frequency response with standard AMPs

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

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Sensitivity average in band from 100 Hz - 10 kHz112.2dB/V SPL
100.5dB/mW SPL
Impedance average in band from 40 Hz - 15 kHz67.8ohm
For 90 dB SPL, a voltage is required-22.2dBV
0.078VRMS
Taking into account the peak factor of 9 dB for the music signal-13.2 dBV
0.219VRMS
Measurements were performed on the stand:HDM1 , SF1




We tested Koss Porta Pro in 2010~2014 on older HDM1 stand. Now all headphones of this type test on modern HDM-X stand. Frequency response in this report in not precision and it don't compare with frequency response another headphones, which test on HDM-X stand. If possible, we’ll retest those headphones. You can give us Koss Porta Pro and we test its again and will refresh this report.



Frequency response and sensitivity headphones Koss Porta Pro headphone

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Channel

Channel:LeftRight
Sensitivity average in band from 100 Hz - 10 kHz112.2 112.2dB/V SPL
Sensitivity average in band from 100 Hz - 10 kHz100.5100.5 dB/mW SPL
Sensitivity at 1 kHz109.5109.6dB/V SPL
Sensitivity at 500 Hz110.7110.9dB/mW SPL


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Frequency response of headphone Koss Porta Pro headphone

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Channel

Range

Smoothing

Channel:LeftRight
Variation in frequency response in band from 100 Hz - 10 kHz -4.3, +8.3-5.0, +6.1dB


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Impedance Koss Porta Pro headphone

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Channel

Channel:LeftRight
Impedance average in band from 40 Hz - 15 kHz67.3 68.2ohm
Resistance at 1 kHz59.0 58.2ohm
Resistance at 500 Hz61.6 60.2ohm
The minimum value in band from 40 Hz - 15 kHz58.8 57.9ohm
The maximum value in band from 40 Hz - 15 kHz105.5 104.5ohm


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Clicking on the graph will take you to the comparison page of different headphone models with advanced graph display settings.



Electric phase Koss Porta Pro headphone

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Channel

Range

Channel:LeftRight
Phase deviation is the average in the range 40 Hz - 15 kHz1.7 0.4°
Phase at 1 kHz-2.8 -2.8°
Phase at 500 Hz-8.2 -7.9°
The minimum value in band from 40 Hz - 15 kHz-16.3 -16.2°
The maximum value in band from 40 Hz - 15 kHz17.1 17.2°




Brief information

Clicking on the graph will take you to the comparison page of different headphone models with advanced graph display settings.



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

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Channel

Range

Variation in frequency response in band from 30 Hz - 12 kHz
Channel:LeftRight
Deviation -36.0 dB-22.7, +13.0 (35.8)-17.4, +12.9 (30.3)dB
Deviation -24.0 dB-18.5, +11.1 (29.6)-13.2, +11.0 (24.1)dB
Deviation -12.0 dB-14.3, +9.1 (23.5)-9.0, +9.0 (18.0)dB
Deviation 0.0 dB-10.1, +7.2 (17.4)-9.0, +7.0 (16.0)dB
Deviation 12.0 dB-10.8, +7.4 (18.2)-10.4, +7.1 (17.5)dB
Deviation 24.0 dB-11.9, +9.1 (20.9)-11.8, +9.3 (21.1)dB
Deviation 36.0 dB-12.9, +10.7 (23.6)-13.1, +11.6 (24.7)dB

Variation in frequency response in band from 40 Hz - 1 kHz
Channel:LeftRight
Deviation -36.0 dB-22.7, +13.0 (35.8)-17.4, +12.9 (30.3)dB
Deviation -24.0 dB-18.5, +11.1 (29.6)-13.2, +11.0 (24.1)dB
Deviation -12.0 dB-14.3, +9.1 (23.5)-9.0, +9.0 (18.0)dB
Deviation 0.0 dB-10.1, +7.2 (17.4)-9.0, +7.0 (16.0)dB
Deviation 12.0 dB-10.8, +7.4 (18.2)-10.4, +7.1 (17.5)dB
Deviation 24.0 dB-11.9, +9.1 (20.9)-11.8, +9.3 (21.1)dB
Deviation 36.0 dB-12.9, +10.7 (23.6)-13.1, +11.6 (24.7)dB


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

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Channel

Range

Frequency response

Frequency response of amplifier with constant output resistance 100 Hz - 10 kHz
Channel:LeftRight
Koss Porta Pro + AMP 0 Ω -1.6, +11.0-2.5, +8.7dB
Koss Porta Pro + AMP 10 Ω -1.5, +11.1-2.4, +8.8dB
Koss Porta Pro + AMP 20 Ω -1.5, +11.1-2.4, +8.8dB
Koss Porta Pro + AMP 50 Ω -1.4, +11.3-2.3, +9.0dB
Koss Porta Pro + AMP 100 Ω -1.4, +11.4-2.2, +9.1dB
Koss Porta Pro + AMP 300 Ω -1.3, +11.6-2.2, +9.3dB

Variation in frequency response with amplifiers with constant output resistance @ 100 Hz - 10 kHz
Channel:LeftRight
Koss Porta Pro + AMP 0 Ω 0.00.0dB
Koss Porta Pro + AMP 10 Ω 0.60.6dB
Koss Porta Pro + AMP 20 Ω 1.01.1dB
Koss Porta Pro + AMP 50 Ω 2.02.0dB
Koss Porta Pro + AMP 100 Ω 2.82.9dB
Koss Porta Pro + AMP 300 Ω 4.04.1dB


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

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Channel

Range

Frequency response

Variation in frequency response in band from 100 Hz - 10 kHz
Channel:LeftRight
Koss Porta Pro + AMP 0 Ω -1.6, +11.0-2.5, +8.7dB
Koss Porta Pro + AMP ➘ 0 Ω -1.6, +11.0-2.4, +8.7dB

Deviation of frequency response @ 40 Hz
Channel:LeftRight
Koss Porta Pro + AMP 0 Ω 0.00.0dB
Koss Porta Pro + AMP ➘ 0 Ω 0.60.6dB


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Measurements of Koss Porta Pro were carried out by Roman Kuznetsov on the hardware-software complex RAA.

The Koss Porta Pro 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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Koss Porta Pro is available in reports and services. You are in a professional report.

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