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 .
  • Sensitivity: 90.9dB (avg. 100Hz-1kHz for 2.83V measured at 1m).
  • -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.
  • Directivity
    • Horizontal directivity is (-20.0°, 40.0°) between 1kHz and 10kHz. Angle computed for +/-6dB.
    • Vertical directivity is (-40.0°, 40.0°) between 1kHz and 10kHz. Angle computed for +/-6dB.
  • 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 180 mm)
    • Weight 4.0 kg
JBL 4312MII
AutomaticEQ (IIR)
Set preamp gain to: -2.9dB.
Type Freq Q Gain
3 65.0 0.45 3.0
3 219.0 1.21 -1.59
3 739.0 1.49 -3.93
3 1586.0 0.77 2.71
3 2245.0 2.94 -1.29
3 4818.0 2.67 -7.4
3 8694.0 3.0 -8.99
Download

These EQ optimise the Harman score and is a good start for far field listening like in your living room.

JBL 4312MII filters_auto_eq

AutomaticEQ

JBL 4312MII filters_eq_full

Target v.s. EQ

Frequency Frequency with EQ
Frequency Frequency with EQ
Frequency Frequency with EQ
Frequency Frequency with EQ
Frequency Frequency with EQ
Frequency Frequency with EQ
Frequency Frequency with EQ
Frequency Frequency with EQ
Frequency Frequency with EQ
Frequency Frequency with EQ
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