What we know about the measurement:

JBL CBT 70J-1 is a passive cbt that cost around 1000 USD each.

  • Quality of the measurement data is high.
  • Origin of the data is ASR.
  • Format of the data is generated by a Klippel NFS .
  • Sensitivity: 91.6dB (avg. 100Hz-1kHz for 2.83V measured at 1m).
  • -3dB (resp. -6db) point v.s. reference is at 120.1Hz (resp. 71.8Hz).
  • Reference level is normalised to 0.1dB computed over the frequency range [300.0Hz, 5000.0Hz].
  • Frequency deviation is 4.0dB over the same frequency range.
  • Directivity
    • Horizontal directivity is (-80.0°, 70.0°) 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
    • Note: The tonality (Preference) score does not make sense for cbt speakers. Don't give too much credits to the value.
    • Tonality (Preference) Score is 2.91 and would be 5.83 with a perfect subwoofer.
      • Details: NBD: ON 0.649, LW 0.573, SP 0.499, PIR 0.495; SM: SP0.772, PIR0.538; LFQ 1.219, LFX 68Hz
    • Tonality (Preference) Score is 4.9 with an EQ and would be 7.65 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.448, LW 0.374, SP 0.363, PIR 0.323; SM: SP0.888, PIR0.887; LFQ 0.991, LFX 62Hz
  • Link to Original review.
JBL CBT 70J-1
AutomaticEQ (IIR)
Set preamp gain to: -3.0dB.
Type Freq Q Gain
PK 95.0 1.49 2.99
PK 321.0 3.0 1.87
PK 522.0 2.98 2.33
PK 910.0 2.99 -3.42
PK 2023.0 2.8 2.08
PK 5732.0 0.61 -3.71
PK 16239.0 0.26 2.95
Download

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

JBL CBT 70J-1 filters_auto_eq

AutomaticEQ

JBL CBT 70J-1 filters_eq_full

Target v.s. EQ

JBL CBT 70J-1
Graphic EQ 15 bands
Set preamp gain to: -1.1dB.
Type Freq Q Gain
PK 25.0 2.14 0.75
PK 40.0 2.14 0.75
PK 63.0 2.14 0.75
PK 100.0 2.14 0.75
PK 160.0 2.14 0.25
PK 250.0 2.14 0.25
PK 400.0 2.14 0.5
PK 630.0 2.14 0.25
PK 1000.0 2.14 -0.25
PK 1600.0 2.14 0.25
PK 2500.0 2.14 0.0
PK 4000.0 2.14 -0.25
PK 6300.0 2.14 -0.25
PK 10000.0 2.14 0.25
PK 16000.0 2.14 0.75
Download

These EQ is designed for a 15 bands graphical EQ.

JBL CBT 70J-1
Graphic EQ 31 bands
Set preamp gain to: -0.8dB.
Type Freq Q Gain
PK 20.0 4.32 0.0
PK 25.0 4.32 0.5
PK 31.0 4.32 0.5
PK 40.0 4.32 0.5
PK 50.0 4.32 0.5
PK 63.0 4.32 0.5
PK 80.0 4.32 0.5
PK 100.0 4.32 0.5
PK 125.0 4.32 0.5
PK 160.0 4.32 0.25
PK 200.0 4.32 0.25
PK 250.0 4.32 0.25
PK 315.0 4.32 0.5
PK 400.0 4.32 0.25
PK 500.0 4.32 0.5
PK 630.0 4.32 0.25
PK 800.0 4.32 0.0
PK 1000.0 4.32 0.0
PK 1250.0 4.32 0.25
PK 1600.0 4.32 0.25
PK 2000.0 4.32 0.25
PK 2500.0 4.32 0.0
PK 3150.0 4.32 0.0
PK 4000.0 4.32 0.0
PK 5000.0 4.32 0.0
PK 6300.0 4.32 0.0
PK 8000.0 4.32 0.25
PK 10000.0 4.32 0.25
PK 12000.0 4.32 0.5
PK 16000.0 4.32 0.75
PK 20000.0 4.32 0.0
Download

These EQ is designed for a 31 bands graphical EQ.

JBL CBT 70J-1: comparison between EQs
JBL CBT 70J-1

Comparison betweens various EQs

JBL CBT 70J-1

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
Frequency Frequency with EQ
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