What we know about the measurement:

JBL 4312MII is a passive bookshelves that cost around 1000 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 117.2Hz (resp. 90.8Hz).
  • Reference level is normalised to -0.5dB computed over the frequency range [300.0Hz, 5000.0Hz].
  • Frequency deviation is 9.3dB over the same frequency range.
  • Tonality (Preference) Score
    • Tonality (Preference) Score is 0.68 and would be 3.99 with a perfect subwoofer.
      • Details: NBD: ON 1.085, LW 0.943, SP 0.945, PIR 0.864; SM: SP0.804, PIR0.688; LFQ 0.777, LFX 84Hz
    • Tonality (Preference) Score is 4.07 with an EQ and would be 6.68 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.619, LW 0.505, SP 0.57, PIR 0.478; SM: SP0.898, PIR0.853; LFQ 0.664, LFX 58Hz
  • Link to Original review.
  • Vendor specifications:
    • Sensitivity 92 dB
    • Impedance 6 Ohm
    • Size
      • Width 180mm
      • Height 300mm
      • Depth 180mm
    • Weight 4.0kg
JBL 4312MII
AutomaticEQ (IIR)
Set preamp gain to: -2.9dB.
Type Freq Q Gain
PK 65.0 0.45 3.0
PK 219.0 1.21 -1.59
PK 739.0 1.49 -3.93
PK 1586.0 0.77 2.71
PK 2245.0 2.94 -1.29
PK 4818.0 2.67 -7.4
PK 8694.0 3.0 -8.99
Download
This EQ optimise the Harman score and is a good start for far field listening like in your living room.
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)
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