What we know about the measurement:

JBL Synthesis SCL-4 is a passive inwall that cost around 3990 USD each.

  • Quality of the measurement data is medium.
  • Origin of the data is JBL.
  • Format of the data is a scanned image .
  • Sensitivity: 91.2dB (avg. 100Hz-1kHz for 2.83V estimated at 1m)
  • -3dB (resp. -6db) point v.s. reference is at 83.7Hz (resp. 70.9Hz).
  • Reference level is normalised to 0.7dB computed over the frequency range [300.0Hz, 5000.0Hz].
  • Frequency deviation is 3.1dB over the same frequency range.
  • Tonality (Preference) Score
    • Note: The tonality (Preference) score does not make sense for inwall speakers. Don't give too much credits to the value.
    • Tonality (Preference) Score is 2.24 and would be 5.25 with a perfect subwoofer.
      • Details: NBD: ON 0.419, LW 0.452, SP 0.489, PIR 0.47; SM: SP0.232, PIR0.008; LFQ 0.082, LFX 72Hz
    • Tonality (Preference) Score is 5.08 with an EQ and would be 7.96 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.33, LW 0.304, SP 0.356, PIR 0.327; SM: SP0.931, PIR0.897; LFQ 0.204, LFX 67Hz
  • Link to original Review: avs review. .
  • Vendor specifications:
    • Dispersion: 100° horizontal and 100° vertical.
    • Sensitivity 91 dB
    • Impedance 6 Ohm
    • Size
      • Width 409mm
      • Height 636mm
      • Depth 93 mm)
    • Weight 12.51 kg
JBL Synthesis SCL-4
AutomaticEQ (IIR)
Set preamp gain to: -0.0dB.
Type Freq Q Gain
6 1948.0 1.63 -3.0
3 4582.0 1.41 -1.94
3 280.0 3.0 -1.46
3 736.0 3.0 -1.02
3 7903.0 2.82 -0.81
3 131.0 2.97 -0.98
3 14555.0 2.93 -0.99
3 14231.0 2.97 -1.03
3 3692.0 2.99 -1.03
Download

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

JBL Synthesis SCL-4 filters_auto_eq

AutomaticEQ

JBL Synthesis SCL-4 filters_eq_full

Target v.s. EQ

JBL Synthesis SCL-4
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 0.25
3 100.0 2.14 0.0
3 160.0 2.14 0.0
3 250.0 2.14 -0.25
3 400.0 2.14 0.0
3 630.0 2.14 -0.25
3 1000.0 2.14 0.0
3 1600.0 2.14 -0.25
3 2500.0 2.14 -0.5
3 4000.0 2.14 -1.0
3 6300.0 2.14 -1.0
3 10000.0 2.14 -0.75
3 16000.0 2.14 -0.75
Download

These EQ is designed for a 15 bands graphical EQ.

JBL Synthesis SCL-4
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 0.25
3 63.0 4.32 0.25
3 80.0 4.32 0.25
3 100.0 4.32 0.0
3 125.0 4.32 -0.25
3 160.0 4.32 0.0
3 200.0 4.32 0.0
3 250.0 4.32 -0.25
3 315.0 4.32 -0.25
3 400.0 4.32 0.0
3 500.0 4.32 0.0
3 630.0 4.32 -0.25
3 800.0 4.32 -0.25
3 1000.0 4.32 0.0
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 -0.75
3 4000.0 4.32 -1.0
3 5000.0 4.32 -1.0
3 6300.0 4.32 -1.0
3 8000.0 4.32 -1.0
3 10000.0 4.32 -0.75
3 12000.0 4.32 -1.0
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 Synthesis SCL-4: comparison between EQs
JBL Synthesis SCL-4

Comparison betweens various EQs

JBL Synthesis SCL-4

Improvements made by EQ

Frequency Frequency with EQ
Frequency Frequency with EQ
Frequency Frequency with EQ
;