What we know about the measurement:

PMC Twenty 21 is a passive bookshelves that cost around 2000 USD for a pair.

  • Quality of the measurement data is high.
  • Origin of the data is ASR.
  • Format of the data is generated by a Klippel NFS .
  • -3dB (resp. -6db) point v.s. reference is at 68.8Hz (resp. 60.1Hz).
  • Reference level is normalised to -0.4dB computed over the frequency range [300.0Hz, 5000.0Hz].
  • Frequency deviation is 3.3dB over the same frequency range.
  • Tonality (Preference) Score
    • Tonality (Preference) Score is 2.3 and would be 5.05 with a perfect subwoofer.
      • Details: NBD: ON 0.608, LW 0.484, SP 0.481, PIR 0.461; SM: SP0.507, PIR0.111; LFQ 0.538, LFX 62Hz
    • Tonality (Preference) Score is 5.31 with an EQ and would be 7.97 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.451, LW 0.312, SP 0.294, PIR 0.245; SM: SP0.963, PIR0.928; LFQ 0.538, LFX 60Hz
  • Link to Original review.
PMC Twenty 21
AutomaticEQ (IIR)
Set preamp gain to: -3.5dB.
Type Freq Q Gain
PK 158.0 1.27 1.61
PK 229.0 2.96 2.98
PK 289.0 2.02 -2.89
PK 432.0 2.97 1.53
PK 965.0 1.12 -1.06
PK 1491.0 2.29 2.17
PK 1884.0 2.2 2.88
PK 6276.0 1.15 -2.22
PK 11454.0 1.15 -2.88
Download
This EQ optimise the Harman score and is a good start for far field listening like in your living room.
PMC Twenty 21
flipflop@ASR (IIR)
Set preamp gain to: -4.6dB.
Type Freq Q Gain
PK 325.0 5.0 -0.6
PK 425.0 5.0 2.6
PK 480.0 5.0 1.0
PK 526.0 4.577 -2.3
PK 554.0 3.3 2.3
PK 655.0 10.0 -0.4
PK 1157.0 1.0 1.1
PK 1416.0 5.0 2.6
PK 1744.0 5.0 2.4
PK 2035.0 2.596 2.3
PK 2250.0 19.0 0.8
PK 2380.0 20.0 -0.7
PK 2552.0 2.69 1.2
PK 3335.0 1.0 -3.7
PK 3480.0 1.484 4.5
PK 6640.0 10.0 -0.5
PK 7324.0 1.0 -1.9
PK 7530.0 9.0 0.6
PK 11506.0 1.83 -2.7
PK 16600.0 3.5 1.1
Download
This EQ is designed by ASR member flipflop.
PMC Twenty 21
Graphic EQ 15 bands
Set preamp gain to: -0.7dB.
Type Freq Q Gain
PK 25.0 2.14 0.5
PK 40.0 2.14 0.5
PK 63.0 2.14 0.5
PK 100.0 2.14 -0.25
PK 160.0 2.14 0.25
PK 250.0 2.14 0.0
PK 400.0 2.14 -0.25
PK 630.0 2.14 -0.25
PK 1000.0 2.14 -0.25
PK 1600.0 2.14 0.25
PK 2500.0 2.14 0.0
PK 4000.0 2.14 -0.5
PK 6300.0 2.14 -0.75
PK 10000.0 2.14 -1.0
PK 16000.0 2.14 -0.5
Download
This EQ is designed for a 15 bands graphical EQ.
PMC Twenty 21
Graphic EQ 31 bands
Set preamp gain to: -0.7dB.
Type Freq Q Gain
PK 20.0 4.32 0.0
PK 25.0 4.32 0.5
PK 31.0 4.32 0.5
PK 40.0 4.32 0.5
PK 50.0 4.32 0.5
PK 63.0 4.32 0.5
PK 80.0 4.32 0.0
PK 100.0 4.32 -0.25
PK 125.0 4.32 0.0
PK 160.0 4.32 0.25
PK 200.0 4.32 0.25
PK 250.0 4.32 0.0
PK 315.0 4.32 -0.5
PK 400.0 4.32 0.0
PK 500.0 4.32 -0.25
PK 630.0 4.32 -0.25
PK 800.0 4.32 -0.25
PK 1000.0 4.32 -0.25
PK 1250.0 4.32 0.0
PK 1600.0 4.32 0.25
PK 2000.0 4.32 0.25
PK 2500.0 4.32 0.0
PK 3150.0 4.32 -0.25
PK 4000.0 4.32 -0.25
PK 5000.0 4.32 -0.5
PK 6300.0 4.32 -0.75
PK 8000.0 4.32 -0.75
PK 10000.0 4.32 -0.75
PK 12000.0 4.32 -0.75
PK 16000.0 4.32 -0.25
PK 20000.0 4.32 0.0
Download
This EQ is designed for a 31 bands graphical EQ.
Improvement made by adding the above EQ
EQ
AutoEQ
Target v.s. EQ
Target v.s. EQ
Histogram of errors
On Axis (fullrange)
Listening Window (fullrange)
Predicted In-Room Response (fullrange)
PMC Twenty 21: comparison between EQs
AutomaticEQ
Target v.s. EQ
Comparison betweens various EQs
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