Measurement's report(16) Grado SR 225e test and graphs(17) - Reference Audio Analyzer
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Test report(18) Grado SR 225e

Test report - general data(19) headphone(172) Grado SR 225e

Frequency response, Impedance, Frequency response with standard AMPs (20)


Graphics setting view(253)
Frequency band, Hz:(255)
Range, dB:(258)

General results(44) Grado SR 225e
Channel(37)
Summary (Right + Left)(38)
Sensitivity average in band from(171) 100 Hz to (290) 0,01 kHz, dB/V(284)
117,2
Impedance average in band from(283) 40 Hz to (290) 15 kHz, ohm(285)
37,3
For (286) 94,0 dB SPL need, VRMS(287)
0,069
For (286) 94,0 dB SPL need, mW(288)
0,128

The table shows a most important technical characteristics of (280) Grado SR 225e

*Center channel headphone is received by averaging between left and right channels(281)

Test conditions(24)

  • Type of headphones(57): On-ear(55)
  • Measurements were performed on the stand:(89)
    • with on the simulator of human head with ears (94) HDM-X with natural acoustic damping (96)
  • Calculate headphone's SPL(25) Grado SR 225e taking into amplifier(26) by online calculator(28) based on table's data(27)
  • Headphone: Low-impedance(226)



Report content(203)

Detailed measurements report of technical characteristics(15)

Sensitivity(98) headphone(172) Grado SR 225e


Graphics setting view(253)
Frequency band, Hz:(255)
Channel:(259)

  • Type of headphones(57): On-ear(55)
  • Measurements were performed on the stand:(89)
    • with on the simulator of human head with ears (94) HDM-X with natural acoustic damping (96)
Calculate headphone's SPL(25) Grado SR 225e with the amplifier it is possible in an online calculator based on the data in the table(99)

Sensitivity(316) Grado SR 225e
Channel(37)
Left(39)
Right(40)
Sensitivity average in band from(171) 100 Hz to (290) 10 kHz, dB/V(284)
115,9
118,2
Sensitivity at(252) 500 Hz at 1 V, dB(317)
112,3
116,0
Sensitivity at(252) 500 Hz at 1 mW, dB(318)
97,4
101,1
Sensitivity at(252) 1000 Hz at 1 V, dB(317)
113,0
116,6
Sensitivity at(252) 1000 Hz at 1 mW, dB(318)
97,9
101,5

The sensitivity was calculated by data from the measuring stand(319) HDM-X



Frequency response (22) headphone(172) Grado SR 225e


Graphics setting view(253)
Frequency band, Hz:(255)
Range, dB:(258)
Channel:(259)

  • Type of headphones(57): On-ear(55)
  • Measurements were performed on the stand:(89)
    • with on the simulator of human head with ears (94) HDM-X with natural acoustic damping (96)
Frequency response (22) Grado SR 225e
Channel(37)
Left(39)
Right(40)
Variation in frequency response in band from(251) 100 Hz to (290) 10 kHz, dB(289)
-3,68, 10,56
-2,83, 6,09

Impedance (23) headphone(172) Grado SR 225e


Graphics setting view(253)
Frequency band, Hz:(255)
Channel:(259)

Impedance (23) Grado SR 225e
Channel(37)
Left(39)
Right(40)
Impedance average in band from(283) 40 Hz to (290) 15 kHz, ohm(285)
36,6
38,0
Resistance at(320) 500 Hz, ohm(321)
32,1
32,3
Resistance at(320) 1000 Hz, ohm(321)
31,0
31,1
The minimum value in band from(322) 40 Hz to (290) 15 kHz at frequency, Hz(324)
1440,2
1367,6
The minimum value in band from(322) 40 Hz to (290) 15 kHz, ohm(285)
30,9
31,0
The maximum value in band from(323) 40 Hz to (290) 15 kHz at frequency, Hz(324)
74,4
67,1
The maximum value in band from(323) 40 Hz to (290) 15 kHz, ohm(285)
63,1
70,1

Electric phase(100) headphone(172) Grado SR 225e


Graphics setting view(253)
Frequency band, Hz:(255)
Range, degree:(257)
Channel:(259)

Electric phase(100) Grado SR 225e
Channel(37)
Left(39)
Right(40)
Average variation in phase response in band from (326) 20 Hz to (290) 20 kHz, degree(327)
1,8
1,4
The minimum value in band from(322) 20 Hz to (290) 20 kHz at frequency, Hz(324)
120,6
116,5
The minimum value in band from(322) 20 Hz to (290) 20 kHz, degree(327)
-16,3
-18,4
The maximum value in band from(323) 20 Hz to (290) 20 kHz at frequency, Hz(324)
50,1
42,2
The maximum value in band from(323) 20 Hz to (290) 20 kHz, degree(327)
23,0
26,3

Frequency response of amplifier with constant output resistance(205) from (380) headphone(172) Grado SR 225e


Graphics setting view(253)
Frequency band, Hz:(255)
Range, dB:(258)
Channel:(259)

Frequency response of headphone (350) Grado SR 225e with amplifier with a constant impedance(351)
Channel(37)
Left(39)
Right(40)
Variation in FR from AMP (352) 0 ohm in band (353) 100 Hz to (290) 10 kHz, dB(289)
-3,68, +10,56
-2,83, +6,09
Variation in FR from AMP (352) 10 ohm in band (353) 100 Hz to (290) 10 kHz, dB(289)
-3,75, +10,45
-2,69, +5,98
Variation in FR from AMP (352) 20 ohm in band (353) 100 Hz to (290) 10 kHz, dB(289)
-3,80, +10,39
-2,60, +5,90
Variation in FR from AMP (352) 50 ohm in band (353) 100 Hz to (290) 10 kHz, dB(289)
-3,87, +10,28
-2,47, +5,79
Variation in FR from AMP (352) 100 ohm in band (353) 100 Hz to (290) 10 kHz, dB(289)
-3,93, +10,20
-2,55, +5,71
Variation in FR from AMP (352) 300 ohm in band (353) 100 Hz to (290) 10 kHz, dB(289)
-3,99, +10,12
-2,65, +5,63

Variation in frequency response with amplifiers with constant output resistance(206) from (380) headphone(172) Grado SR 225e


Graphics setting view(253)
Frequency band, Hz:(255)
Range, dB:(258)
Channel:(259)

Variation in frequency response with amplifiers with constant output resistance(206) from (380) Grado SR 225e
Channel(37)
Summary (Right + Left)(38)
With amplifier impedance at (348) 10 ohm in band (353) 20 Hz to (290) 20 kHz, dB(289)
1,2
With amplifier impedance at (348) 20 ohm in band (353) 20 Hz to (290) 20 kHz, dB(289)
2,0
With amplifier impedance at (348) 50 ohm in band (353) 20 Hz to (290) 20 kHz, dB(289)
3,4
With amplifier impedance at (348) 100 ohm in band (353) 20 Hz to (290) 20 kHz, dB(289)
4,5
With amplifier impedance at (348) 300 ohm in band (353) 20 Hz to (290) 20 kHz, dB(289)
5,7

*Center channel is received by data averaging between the left and right channels(279)


Frequency response with an amplifier with zero output resistance and raising of output resistance in low frequencies(207) from (380) headphone(172) Grado SR 225e


Graphics setting view(253)
Frequency band, Hz:(255)
Range, dB:(258)
Channel:(259)

Frequency response with an amplifier with zero output resistance and raising of output resistance in low frequencies(207) from (380) Grado SR 225e
Channel(37)
Left(39)
Right(40)
Variation in frequency response in band from(251) 100 Hz to (290) 10 kHz, dB(289)
-3,68, 10,56
-2,83, 6,09

Variation in frequency response an amplifier with zero output resistance with raising-up of output resistance in low frequencies(208) from (380) headphone(172) Grado SR 225e


Graphics setting view(253)
Frequency band, Hz:(255)
Range, dB:(258)
Channel:(259)

Variance of frequency response(346) Grado SR 225e depending on the total output resistance of the amplifier with zero resistance and a rise of resistance at low frequencies(356)
Variance frequency response at the frequency(357) 20 Hz, dB(358)
-3,1
Variance frequency response at the frequency(357) 40 Hz, dB(358)
-1,5
Variance frequency response at the frequency(357) 80 Hz, dB(358)
-0,2

Perception of headphone frequency response curves of equal loudness ISO 226-2009(209) from (380) headphone(172) Grado SR 225e


Graphics setting view(253)
Channel:(259)

Perception of headphone frequency response curves of equal loudness ISO 226-2009(209) from (380) Grado SR 225e
Channel(37)
Summary (Right + Left)(38)
From level (381) 48 dB at(382) 72 dB SPL in band (383) 100 Hz to (290) 10 kHz, dB(289)
-5,3, +10,9
From level (381) 36 dB at(382) 72 dB SPL in band (383) 100 Hz to (290) 10 kHz, dB(289)
-4,5, +7,9
From level (381) 24 dB at(382) 72 dB SPL in band (383) 100 Hz to (290) 10 kHz, dB(289)
-3,8, +4,9
From level (381) 12 dB at(382) 72 dB SPL in band (383) 100 Hz to (290) 10 kHz, dB(289)
-3,2, +5,9
From level (381) 0 dB at(382) 72 dB SPL in band (383) 100 Hz to (290) 10 kHz, dB(289)
-3,1, +6,9
From level (381) -12 dB at(382) 72 dB SPL in band (383) 100 Hz to (290) 10 kHz, dB(289)
-4,6, +7,9
From level (381) -24 dB at(382) 72 dB SPL in band (383) 100 Hz to (290) 10 kHz, dB(289)
-7,2, +8,9
From level (381) -36 dB at(382) 72 dB SPL in band (383) 100 Hz to (290) 10 kHz, dB(289)
-9,9, +9,8

*Center channel is received by data averaging between the left and right channels(279)


Impulse response(112) headphone(172) Grado SR 225e


Graphics setting view(253)
Time, ms:(254)
Channel:(259)





Impulse Response Envelope (ETC - Energy Time Curve)(114) headphone(172) Grado SR 225e


Graphics setting view(253)
Time, ms:(254)
Range, dB:(258)
Channel:(259)





Step response(113) headphone(172) Grado SR 225e


Graphics setting view(253)
Time, ms:(254)
Channel:(259)





QSD / Watterfall (103) headphone(172) Grado SR 225e


Graphics setting view(253)
Frequency band, Hz:(255)
Channel:(259)


Delta QSD / Delta Watterfall (104) headphone(172) Grado SR 225e


Graphics setting view(253)
Frequency band, Hz:(255)
Channel:(259)