What we know about the measurement:

JBL Northridge Series N28 is a passive bookshelves

  • Quality of the measurement data is medium.
  • Origin of the data is JBL.
  • Format of the data is .
  • Sensitivity: 88.2dB (avg. 100Hz-1kHz for 2.83V measured at 1m).
  • -3dB (resp. -6db) point v.s. reference is at 55.0Hz (resp. 48.6Hz).
  • Reference level is normalised to 0.8dB computed over the frequency range [300.0Hz, 5000.0Hz].
  • Frequency deviation is 5.3dB over the same frequency range.
  • Tonality (Preference) Score
    • Tonality (Preference) Score is 3.09 and would be 5.37 with a perfect subwoofer.
      • Details: NBD: ON 0.773, LW 0.726, SP 0.685, PIR 0.642; SM: SP0.79, PIR0.661; LFQ 1.521, LFX 48Hz
    • Tonality (Preference) Score is 5.38 with an EQ and would be 7.16 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.591, LW 0.511, SP 0.38, PIR 0.374; SM: SP0.908, PIR0.893; LFQ 1.365, LFX 37Hz
JBL Northridge Series N28
AutomaticEQ (IIR)
Set preamp gain to: -3.0dB.
Type Freq Q Gain
3 37.0 1.66 2.99
3 98.0 1.76 -0.47
3 579.0 0.92 -2.5
3 3068.0 2.86 -7.49
3 4818.0 0.37 2.25
3 6144.0 0.28 2.52
3 7834.0 1.06 -8.73
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These EQ optimise the Harman score and is a good start for far field listening like in your living room.

JBL Northridge Series N28 filters_auto_eq

AutomaticEQ

JBL Northridge Series N28 filters_eq_full

Target v.s. EQ

JBL Northridge Series N28
Graphic EQ 15 bands
Set preamp gain to: -0.6dB.
Type Freq Q Gain
3 25.0 2.14 0.5
3 40.0 2.14 0.5
3 63.0 2.14 0.0
3 100.0 2.14 0.0
3 160.0 2.14 -0.25
3 250.0 2.14 0.0
3 400.0 2.14 -0.25
3 630.0 2.14 -0.25
3 1000.0 2.14 0.0
3 1600.0 2.14 0.0
3 2500.0 2.14 0.25
3 4000.0 2.14 0.5
3 6300.0 2.14 -0.25
3 10000.0 2.14 -0.25
3 16000.0 2.14 0.25
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These EQ is designed for a 15 bands graphical EQ.

JBL Northridge Series N28
Graphic EQ 31 bands
Set preamp gain to: -0.9dB.
Type Freq Q Gain
3 20.0 4.32 0.0
3 25.0 4.32 0.5
3 31.0 4.32 0.5
3 40.0 4.32 0.5
3 50.0 4.32 0.5
3 63.0 4.32 0.0
3 80.0 4.32 0.0
3 100.0 4.32 0.0
3 125.0 4.32 0.0
3 160.0 4.32 0.0
3 200.0 4.32 0.0
3 250.0 4.32 0.0
3 315.0 4.32 0.0
3 400.0 4.32 -0.25
3 500.0 4.32 -0.25
3 630.0 4.32 -0.25
3 800.0 4.32 0.0
3 1000.0 4.32 0.25
3 1250.0 4.32 0.25
3 1600.0 4.32 0.25
3 2000.0 4.32 0.5
3 2500.0 4.32 0.5
3 3150.0 4.32 0.0
3 4000.0 4.32 0.75
3 5000.0 4.32 0.5
3 6300.0 4.32 0.0
3 8000.0 4.32 -0.5
3 10000.0 4.32 0.0
3 12000.0 4.32 0.5
3 16000.0 4.32 0.5
3 20000.0 4.32 0.0
Download

These EQ is designed for a 31 bands graphical EQ.

JBL Northridge Series N28: comparison between EQs
JBL Northridge Series N28

Comparison betweens various EQs

JBL Northridge Series N28

Improvements made by EQ

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