What we know about the measurement:

JBL 308P Mark ii is an active bookshelves that cost around 500 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 42.5Hz (resp. 39.6Hz).
  • Reference level is normalised to 0.0dB computed over the frequency range [300.0Hz, 5000.0Hz].
  • Frequency deviation is 1.8dB over the same frequency range.
  • Directivity
    • Horizontal directivity is (-60.0°, 60.0°) between 1kHz and 10kHz. Angle computed for +/-6dB.
    • Vertical directivity is (-30.0°, 20.0°) between 1kHz and 10kHz. Angle computed for +/-6dB.
  • Tonality (Preference) Score
    • Tonality (Preference) Score is 5.56 and would be 7.37 with a perfect subwoofer.
      • Details: NBD: ON 0.396, LW 0.355, SP 0.331, PIR 0.314; SM: SP0.843, PIR0.696; LFQ 0.802, LFX 38Hz
    • Tonality (Preference) Score is 6.36 with an EQ and would be 8.1 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.357, LW 0.312, SP 0.292, PIR 0.268; SM: SP0.943, PIR0.91; LFQ 0.802, LFX 36Hz
  • Link to Original review.
  • Vendor specifications:
    • Dispersion: 120° horizontal and 90° vertical.
    • Sensitivity 92 dB
    • SPL
      • max: 102 dB
      • peak: 112 dB
    • Size
      • Width 254mm
      • Height 419mm
      • Depth 308 mm)
    • Weight 8.1 kg
JBL 308P Mark ii
AutomaticEQ (IIR)
Set preamp gain to: -2.8dB.
Type Freq Q Gain
5 47.0 0.5 2.38
3 89.0 2.75 1.79
3 181.0 2.88 0.98
3 547.0 0.44 1.53
3 1032.0 2.01 -1.6
3 1348.0 2.91 2.64
3 4492.0 2.58 -0.05
3 6276.0 2.15 -0.01
3 11077.0 0.64 -0.22
Download

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

JBL 308P Mark ii filters_auto_eq

AutomaticEQ

JBL 308P Mark ii filters_eq_full

Target v.s. EQ

JBL 308P Mark ii
flipflop@ASR (IIR)
Set preamp gain to: -1.0dB.
Type Freq Q Gain
3 335.0 9.0 0.5
3 396.0 15.0 1.1
3 449.0 15.0 -0.7
3 592.0 10.0 1.4
3 637.0 25.0 -0.9
3 1366.0 5.0 3.0
3 1557.0 1.0 -2.3
3 1590.0 9.0 -0.7
3 1765.0 11.0 0.9
3 1930.0 16.0 -0.7
3 2120.0 15.0 0.6
3 2285.0 20.0 -0.7
3 2330.0 4.999 0.9
3 2630.0 15.0 -1.1
3 2840.0 14.0 1.1
3 3620.0 10.0 -0.8
3 6635.0 1.0 -1.2
3 9400.0 6.0 -1.2
3 13300.0 1.2 1.9
3 16000.0 1.8 -4.7
Download

These EQ is designed by ASR member flipflop.

JBL 308P Mark ii
Graphic EQ 15 bands
Set preamp gain to: -0.3dB.
Type Freq Q Gain
3 25.0 2.14 0.25
3 40.0 2.14 0.25
3 63.0 2.14 0.0
3 100.0 2.14 0.0
3 160.0 2.14 0.0
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 0.0
3 2500.0 2.14 -0.25
3 4000.0 2.14 -0.5
3 6300.0 2.14 -0.5
3 10000.0 2.14 -0.5
3 16000.0 2.14 -0.75
Download

These EQ is designed for a 15 bands graphical EQ.

JBL 308P Mark ii
Graphic EQ 31 bands
Set preamp gain to: -0.4dB.
Type Freq Q Gain
3 20.0 4.32 0.0
3 25.0 4.32 0.25
3 31.0 4.32 0.25
3 40.0 4.32 0.25
3 50.0 4.32 0.0
3 63.0 4.32 0.0
3 80.0 4.32 0.25
3 100.0 4.32 0.25
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 0.0
3 500.0 4.32 0.0
3 630.0 4.32 0.0
3 800.0 4.32 0.0
3 1000.0 4.32 -0.25
3 1250.0 4.32 0.0
3 1600.0 4.32 0.0
3 2000.0 4.32 -0.25
3 2500.0 4.32 -0.25
3 3150.0 4.32 -0.25
3 4000.0 4.32 -0.5
3 5000.0 4.32 -0.5
3 6300.0 4.32 -0.5
3 8000.0 4.32 -0.5
3 10000.0 4.32 -0.5
3 12000.0 4.32 -0.5
3 16000.0 4.32 -0.75
3 20000.0 4.32 0.0
Download

These EQ is designed for a 31 bands graphical EQ.

JBL 308P Mark ii: comparison between EQs
JBL 308P Mark ii

Comparison betweens various EQs

JBL 308P Mark ii

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
;