What we know about the measurement:

JBL 4309 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 .
  • Sensitivity: 85.4dB (avg. 100Hz-1kHz for 2.83V measured at 1m).
  • -3dB (resp. -6db) point v.s. reference is at 60.1Hz (resp. 43.9Hz).
  • Reference level is normalised to 0.2dB computed over the frequency range [300.0Hz, 5000.0Hz].
  • Frequency deviation is 4.0dB over the same frequency range.
  • Directivity
    • Horizontal directivity is (-50.0°, 50.0°) between 1kHz and 10kHz. Angle computed for +/-6dB.
    • Vertical directivity is (-20.0°, 40.0°) between 1kHz and 10kHz. Angle computed for +/-6dB.
  • Tonality (Preference) Score
    • Tonality (Preference) Score is 3.6 and would be 5.61 with a perfect subwoofer.
      • Details: NBD: ON 0.661, LW 0.583, SP 0.659, PIR 0.601; SM: SP0.773, PIR0.594; LFQ 0.945, LFX 42Hz
    • Tonality (Preference) Score is 5.27 with an EQ and would be 7.08 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.597, LW 0.491, SP 0.482, PIR 0.401; SM: SP0.931, PIR0.898; LFQ 0.945, LFX 38Hz
  • Link to Original review.
JBL 4309
AutomaticEQ (IIR)
Set preamp gain to: -1.8dB.
Type Freq Q Gain
LS 81.0 0.78 2.97
PK 289.0 1.78 2.22
PK 447.0 0.92 1.4
PK 764.0 2.97 2.81
PK 998.0 2.31 -2.81
PK 1762.0 2.83 2.99
PK 4492.0 2.63 -1.83
PK 7417.0 2.48 -1.9
LS 9691.0 0.6 -1.36
Download

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

JBL 4309 filters_auto_eq

AutomaticEQ

JBL 4309 filters_eq_full

Target v.s. EQ

JBL 4309
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 0.25
PK 400.0 2.14 0.25
PK 630.0 2.14 0.25
PK 1000.0 2.14 -0.5
PK 1600.0 2.14 0.5
PK 2500.0 2.14 0.25
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 0.25
Download

These EQ is designed for a 15 bands graphical EQ.

JBL 4309
Graphic EQ 31 bands
Set preamp gain to: -1.1dB.
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 -0.25
PK 160.0 4.32 -0.25
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 0.25
PK 800.0 4.32 0.25
PK 1000.0 4.32 -0.5
PK 1250.0 4.32 -0.25
PK 1600.0 4.32 0.5
PK 2000.0 4.32 0.5
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 0.25
PK 8000.0 4.32 0.25
PK 10000.0 4.32 0.25
PK 12000.0 4.32 1.0
PK 16000.0 4.32 0.5
PK 20000.0 4.32 0.0
Download

These EQ is designed for a 31 bands graphical EQ.

JBL 4309: comparison between EQs
JBL 4309

Comparison betweens various EQs

JBL 4309

Improvements made by 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
Frequency Frequency with EQ
;