What we know about the measurement:

JBL Control 24CT is a passive inwall that cost around 150 USD each.

  • Quality of the measurement data is low.
  • Origin of the data is JBL.
  • Format of the data is a GLL file .
  • Sensitivity:
    • Sensitivity: 80.4dB (avg. 100Hz-1kHz for 2.83V estimated at 1m).
    • Sensitivity: 60.4dB computed at the measurement distance (10.0m) over the same frequency range.
  • -3dB (resp. -6db) point v.s. reference is at 22.4Hz (resp. 22.4Hz).
  • Reference level is normalised to 0.1dB computed over the frequency range [300.0Hz, 5000.0Hz].
  • Frequency deviation is 1.5dB over the same frequency range.
  • Directivity
    • Horizontal directivity is (-60.0°, 60.0°) between 1kHz and 10kHz. Angle computed for +/-6dB.
    • Vertical directivity is (-60.0°, 50.0°) between 1kHz and 10kHz. Angle computed for +/-6dB.
  • 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 7.07 and would be 8.37 with a perfect subwoofer.
      • Details: NBD: ON 0.131, LW 0.127, SP 0.2, PIR 0.152; SM: SP0.754, PIR0.635; LFQ 4.227, LFX 29Hz
    • Tonality (Preference) Score is 8.69 with an EQ and would be 9.51 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.046, LW 0.027, SP 0.123, PIR 0.067; SM: SP0.868, PIR0.923; LFQ 4.227, LFX 22Hz
  • Link to original Review: jbl review. .
  • Note: Data provided by JBL in GLL format is highly variable, beware. It ranges from excellent to surprising.
JBL Control 24CT
AutomaticEQ (IIR)
Set preamp gain to: -1.3dB.
Type Freq Q Gain
3 74.0 0.25 1.4
3 243.0 1.25 -1.81
3 395.0 1.07 -1.29
3 1700.0 0.82 0.54
3 4051.0 1.21 -0.45
3 11085.0 0.41 -2.06
3 16239.0 0.33 1.77
Download

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

JBL Control 24CT filters_auto_eq

AutomaticEQ

JBL Control 24CT filters_eq_full

Target v.s. EQ

JBL Control 24CT
Graphic EQ 15 bands
Set preamp gain to: -0.9dB.
Type Freq Q Gain
3 25.0 2.14 0.75
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 0.0
3 250.0 2.14 -0.25
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 0.0
3 4000.0 2.14 -0.25
3 6300.0 2.14 -0.25
3 10000.0 2.14 -0.25
3 16000.0 2.14 0.0
Download

These EQ is designed for a 15 bands graphical EQ.

JBL Control 24CT
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 0.75
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 0.25
3 80.0 4.32 0.25
3 100.0 4.32 0.25
3 125.0 4.32 0.25
3 160.0 4.32 0.0
3 200.0 4.32 -0.25
3 250.0 4.32 -0.25
3 315.0 4.32 -0.25
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 -0.25
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 -0.25
3 3150.0 4.32 -0.25
3 4000.0 4.32 -0.25
3 5000.0 4.32 -0.25
3 6300.0 4.32 -0.25
3 8000.0 4.32 -0.25
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 Control 24CT: comparison between EQs
JBL Control 24CT

Comparison betweens various EQs

JBL Control 24CT

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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