What we know about the measurement:

PSI Audio A21-M is an active bookshelves that cost around 3100 USD each.

  • Quality of the measurement data is low.
  • Origin of the data is Sound and Recording.
  • Format of the data is a scanned image .
  • -3dB (resp. -6db) point v.s. reference is at 36.5Hz (resp. 33.6Hz).
  • Reference level is normalised to 0.6dB computed over the frequency range [300.0Hz, 5000.0Hz].
  • Frequency deviation is 1.7dB over the same frequency range.
  • Tonality (Preference) Score
    • Tonality (Preference) Score is 6.14 and would be 7.76 with a perfect subwoofer.
      • Details: NBD: ON 0.304, LW 0.356, SP 0.448, PIR 0.376; SM: SP0.911, PIR0.848; LFQ 1.923, LFX 34Hz
    • Tonality (Preference) Score is 6.96 with an EQ and would be 8.56 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.184, LW 0.221, SP 0.352, PIR 0.251; SM: SP0.953, PIR0.901; LFQ 1.923, LFX 34Hz
  • Link to Original review.
  • Vendor specifications:
    • Dispersion: 80° horizontal and 30° vertical.
    • SPL
      • max: 106 dB
      • peak: 121 dB
    • Size
      • Width 250mm
      • Height 400mm
      • Depth 300mm
    • Weight 12.8kg
PSI Audio A21-M
AutomaticEQ (IIR)
Set preamp gain to: -2.4dB.
Type Freq Q Gain
LS 36.0 0.59 2.97
PK 66.0 0.73 -2.76
PK 102.0 0.89 2.8
PK 354.0 2.95 1.09
PK 447.0 0.59 -1.89
PK 739.0 2.99 2.73
PK 1704.0 1.17 1.0
PK 3110.0 2.79 -1.47
PK 9691.0 1.2 1.4
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This EQ optimise the Harman score and is a good start for far field listening like in your living room.
PSI Audio A21-M
Graphic EQ 15 bands
Set preamp gain to: -0.5dB.
Type Freq Q Gain
PK 25.0 2.14 0.25
PK 40.0 2.14 0.0
PK 63.0 2.14 0.0
PK 100.0 2.14 0.0
PK 160.0 2.14 0.0
PK 250.0 2.14 -0.25
PK 400.0 2.14 0.0
PK 630.0 2.14 0.0
PK 1000.0 2.14 0.0
PK 1600.0 2.14 0.0
PK 2500.0 2.14 0.0
PK 4000.0 2.14 0.25
PK 6300.0 2.14 0.0
PK 10000.0 2.14 0.25
PK 16000.0 2.14 0.5
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This EQ is designed for a 15 bands graphical EQ.
PSI Audio A21-M
Graphic EQ 31 bands
Set preamp gain to: -0.6dB.
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 0.25
PK 50.0 4.32 -0.25
PK 63.0 4.32 -0.25
PK 80.0 4.32 0.0
PK 100.0 4.32 0.0
PK 125.0 4.32 0.0
PK 160.0 4.32 0.0
PK 200.0 4.32 0.0
PK 250.0 4.32 -0.25
PK 315.0 4.32 -0.25
PK 400.0 4.32 -0.25
PK 500.0 4.32 -0.25
PK 630.0 4.32 0.0
PK 800.0 4.32 0.25
PK 1000.0 4.32 0.0
PK 1250.0 4.32 0.0
PK 1600.0 4.32 0.0
PK 2000.0 4.32 0.0
PK 2500.0 4.32 0.25
PK 3150.0 4.32 -0.25
PK 4000.0 4.32 0.0
PK 5000.0 4.32 0.0
PK 6300.0 4.32 0.0
PK 8000.0 4.32 0.25
PK 10000.0 4.32 0.25
PK 12000.0 4.32 0.0
PK 16000.0 4.32 0.5
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)
PSI Audio A21-M: comparison between EQs
AutomaticEQ
Target v.s. EQ
Comparison betweens various EQs
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