What we know about the measurement:

Boston Acoustics A 25 is a passive bookshelves that cost around 180 USD each.

  • 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 82.0Hz (resp. 63.0Hz).
  • Reference level is normalised to -0.2dB computed over the frequency range [300.0Hz, 5000.0Hz].
  • Frequency deviation is 3.2dB over the same frequency range.
  • Tonality (Preference) Score
    • Tonality (Preference) Score is 3.23 and would be 5.89 with a perfect subwoofer.
      • Details: NBD: ON 0.618, LW 0.49, SP 0.386, PIR 0.415; SM: SP0.763, PIR0.426; LFQ 0.317, LFX 60Hz
    • Tonality (Preference) Score is 5.69 with an EQ and would be 8.06 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.436, LW 0.343, SP 0.34, PIR 0.262; SM: SP0.97, PIR0.968; LFQ 0.317, LFX 51Hz
  • Link to Original review.
Boston Acoustics A 25
AutomaticEQ (IIR)
Set preamp gain to: -3.0dB.
Type Freq Q Gain
LS 96.0 0.73 2.98
PK 309.0 2.01 1.01
PK 668.0 2.04 1.47
PK 965.0 2.9 -2.66
PK 1541.0 1.58 0.88
PK 2813.0 2.52 2.55
PK 5677.0 1.47 -2.91
PK 10713.0 2.37 -2.39
PK 13537.0 1.19 -2.6
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This EQ optimise the Harman score and is a good start for far field listening like in your living room.
Boston Acoustics A 25
flipflop@ASR (IIR)
Set preamp gain to: -2.0dB.
Type Freq Q Gain
PK 619.0 5.0 0.9
PK 748.0 5.0 -2.1
PK 775.0 5.0 2.6
PK 937.0 3.729 -3.7
PK 1356.0 5.0 -2.4
PK 1541.0 5.0 2.2
PK 1703.0 5.0 -2.1
PK 2871.0 5.0 6.9
PK 2988.0 4.932 -9.9
PK 3115.0 5.0 5.8
PK 3885.0 8.0 -1.0
PK 4625.0 5.0 0.6
PK 5232.0 5.0 -1.8
PK 5711.0 5.0 -2.1
PK 8083.0 5.0 0.8
PK 8748.0 5.0 2.1
PK 12321.0 5.0 4.2
PK 12870.0 1.446 -10.7
PK 13527.0 5.0 4.6
PK 16700.0 3.3 -1.9
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This EQ is designed by ASR member flipflop.
Boston Acoustics A 25
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 0.0
PK 250.0 2.14 0.0
PK 400.0 2.14 0.0
PK 630.0 2.14 0.0
PK 1000.0 2.14 -0.5
PK 1600.0 2.14 -0.25
PK 2500.0 2.14 0.0
PK 4000.0 2.14 -0.25
PK 6300.0 2.14 -0.5
PK 10000.0 2.14 -0.75
PK 16000.0 2.14 -0.75
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This EQ is designed for a 15 bands graphical EQ.
Boston Acoustics A 25
Graphic EQ 31 bands
Set preamp gain to: -0.8dB.
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 0.5
PK 100.0 4.32 0.25
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 0.0
PK 315.0 4.32 0.0
PK 400.0 4.32 0.0
PK 500.0 4.32 0.0
PK 630.0 4.32 0.0
PK 800.0 4.32 0.0
PK 1000.0 4.32 -0.5
PK 1250.0 4.32 -0.25
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 -0.25
PK 5000.0 4.32 -0.25
PK 6300.0 4.32 -0.25
PK 8000.0 4.32 0.0
PK 10000.0 4.32 -0.5
PK 12000.0 4.32 -0.75
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)
Boston Acoustics A 25: comparison between EQs
AutomaticEQ
Target v.s. EQ
Comparison betweens various EQs
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