What we know about the measurement:

JBL 708i active is an active bookshelves that cost around 5400 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 43.9Hz (resp. 39.6Hz).
  • Reference level is normalised to 0.2dB computed over the frequency range [300.0Hz, 5000.0Hz].
  • Frequency deviation is 5.6dB 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°, 20.0°) between 1kHz and 10kHz. Angle computed for +/-6dB.
  • Tonality (Preference) Score
    • Tonality (Preference) Score is 3.86 and would be 5.74 with a perfect subwoofer.
      • Details: NBD: ON 0.556, LW 0.512, SP 0.471, PIR 0.468; SM: SP0.677, PIR0.366; LFQ 1.047, LFX 39Hz
    • Tonality (Preference) Score is 6.1 with an EQ and would be 7.75 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.417, LW 0.382, SP 0.335, PIR 0.324; SM: SP0.938, PIR0.899; LFQ 1.047, LFX 35Hz
  • Link to Original review.
  • Note: IMPORTANT this is in active mode driven by a Crown DCI 4|300n and JBL's configuration!.
  • Vendor specifications:
    • SPL
      • max: 108 dB
      • peak: 114 dB
    • Size
      • Width 248mm
      • Height 438mm
      • Depth 292 mm)
    • Weight 11.5 kg
JBL 708i active
AutomaticEQ (IIR)
Set preamp gain to: -2.7dB.
Type Freq Q Gain
3 38.0 1.49 2.76
3 279.0 2.16 2.04
3 289.0 0.68 -1.51
3 765.0 2.99 2.26
3 6144.0 1.04 -4.01
3 10707.0 2.96 2.05
3 13652.0 1.33 -4.54
Download

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

JBL 708i active filters_auto_eq

AutomaticEQ

JBL 708i active filters_eq_full

Target v.s. EQ

JBL 708i active
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 0.0
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 -0.25
3 6300.0 2.14 -0.75
3 10000.0 2.14 -0.5
3 16000.0 2.14 -0.5
Download

These EQ is designed for a 15 bands graphical EQ.

JBL 708i active
Graphic EQ 31 bands
Set preamp gain to: -0.7dB.
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 0.25
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 -0.25
3 160.0 4.32 -0.25
3 200.0 4.32 -0.25
3 250.0 4.32 -0.25
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 0.0
3 1600.0 4.32 0.0
3 2000.0 4.32 0.0
3 2500.0 4.32 -0.5
3 3150.0 4.32 -0.25
3 4000.0 4.32 -0.5
3 5000.0 4.32 -0.75
3 6300.0 4.32 -0.75
3 8000.0 4.32 -0.75
3 10000.0 4.32 -0.5
3 12000.0 4.32 -0.75
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 708i active: comparison between EQs
JBL 708i active

Comparison betweens various EQs

JBL 708i active

Improvements made by EQ
CEA2034
On Axis
Early Reflections
Estimated In-Room Response
Horizontal Reflections
Vertical Reflections
SPL Horizontal
SPL Vertical
SPL Horizontal Normalized
SPL Vertical Normalized
SPL Horizontal Contour
SPL Vertical Contour
SPL Horizontal Contour Normalized
SPL Vertical Contour Normalized
SPL Horizontal Contour 3D
SPL Vertical Contour 3D
SPL Horizontal Contour Normalized 3D
SPL Vertical Contour Normalized 3D
SPL Horizontal Radar
SPL Vertical Radar
CEA2034
On Axis
Early Reflections
Estimated In-Room Response
Horizontal Reflections
Vertical Reflections
SPL Horizontal
SPL Vertical
SPL Horizontal Normalized
SPL Vertical Normalized
SPL Horizontal Contour
SPL Vertical Contour
SPL Horizontal Contour Normalized
SPL Vertical Contour Normalized
SPL Horizontal Contour 3D
SPL Vertical Contour 3D
SPL Horizontal Contour Normalized 3D
SPL Vertical Contour Normalized 3D
SPL Horizontal Radar
SPL Vertical Radar
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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