What we know about the measurement:

JBL PRX908 is an active liveportable that cost around 850 USD each.

  • Quality of the measurement data is high.
  • Origin of the data is JBL.
  • Format of the data is a GLL file .
  • -3dB (resp. -6db) point v.s. reference is at 63.0Hz (resp. 58.0Hz).
  • Reference level is normalised to -0.2dB computed over the frequency range [300.0Hz, 5000.0Hz].
  • Frequency deviation is 2.0dB over the same frequency range.
  • Directivity
    • Horizontal directivity is (-50.0°, 40.0°) between 1kHz and 10kHz. Angle computed for +/-6dB.
    • Vertical directivity is (-20.0°, 20.0°) between 1kHz and 10kHz. Angle computed for +/-6dB.
  • Tonality (Preference) Score
    • Tonality (Preference) Score is 3.4 and would be 5.99 with a perfect subwoofer.
      • Details: NBD: ON 0.438, LW 0.542, SP 0.747, PIR 0.652; SM: SP0.74, PIR0.584; LFQ 1.159, LFX 58Hz
    • Tonality (Preference) Score is 4.66 with an EQ and would be 7.31 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.353, LW 0.372, SP 0.556, PIR 0.45; SM: SP0.888, PIR0.801; LFQ 1.159, LFX 60Hz
  • Link to Original review.
  • Vendor specifications:
    • Dispersion: 105° horizontal and 60° vertical.
    • SPL
      • max: 126 dB
    • Size
      • Width 312mm
      • Height 479mm
      • Depth 285 mm)
    • Weight 13.7 kg
JBL PRX908
AutomaticEQ (IIR)
Set preamp gain to: -2.9dB.
Type Freq Q Gain
3 93.0 1.29 -2.96
3 164.0 1.3 2.67
3 342.0 2.63 1.06
3 933.0 0.44 -1.09
3 1648.0 2.84 2.13
3 2014.0 2.44 2.51
3 4803.0 2.88 2.1
3 7669.0 2.99 -2.2
3 12246.0 1.18 -1.27
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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 PRX908 filters_auto_eq

AutomaticEQ

JBL PRX908 filters_eq_full

Target v.s. EQ

JBL PRX908
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 0.25
3 100.0 2.14 -0.25
3 160.0 2.14 0.25
3 250.0 2.14 0.0
3 400.0 2.14 0.0
3 630.0 2.14 0.0
3 1000.0 2.14 -0.25
3 1600.0 2.14 0.5
3 2500.0 2.14 0.25
3 4000.0 2.14 0.25
3 6300.0 2.14 0.25
3 10000.0 2.14 0.0
3 16000.0 2.14 0.5
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These EQ is designed for a 15 bands graphical EQ.

JBL PRX908
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 0.5
3 80.0 4.32 -0.5
3 100.0 4.32 -0.5
3 125.0 4.32 0.0
3 160.0 4.32 0.25
3 200.0 4.32 0.25
3 250.0 4.32 0.0
3 315.0 4.32 0.25
3 400.0 4.32 0.0
3 500.0 4.32 -0.25
3 630.0 4.32 0.0
3 800.0 4.32 -0.25
3 1000.0 4.32 -0.25
3 1250.0 4.32 -0.25
3 1600.0 4.32 0.5
3 2000.0 4.32 0.75
3 2500.0 4.32 0.25
3 3150.0 4.32 0.0
3 4000.0 4.32 0.0
3 5000.0 4.32 0.5
3 6300.0 4.32 0.25
3 8000.0 4.32 -0.5
3 10000.0 4.32 -0.25
3 12000.0 4.32 -0.25
3 16000.0 4.32 0.25
3 20000.0 4.32 0.0
Download

These EQ is designed for a 31 bands graphical EQ.

JBL PRX908: comparison between EQs
JBL PRX908

Comparison betweens various EQs

JBL PRX908

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
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