What we know about the measurement:

KEF Q650C is a passive center that cost around 750 USD

  • Quality of the measurement data is high.
  • Origin of the data is ErinsAudioCorner.
  • Format of the data is generated by a Klippel NFS .
  • Sensitivity: 86.0dB (avg. 100Hz-1kHz for 2.83V measured at 1m).
  • -3dB (resp. -6db) point v.s. reference is at 67.4Hz (resp. 58.6Hz).
  • Reference level is normalised to 0.1dB computed over the frequency range [300.0Hz, 5000.0Hz].
  • Frequency deviation is 4.7dB over the same frequency range.
  • Directivity
    • Horizontal directivity is (-20.0°, 20.0°) between 1kHz and 10kHz. Angle computed for +/-6dB.
    • Vertical directivity is (-50.0°, 50.0°) between 1kHz and 10kHz. Angle computed for +/-6dB.
  • Tonality (Preference) Score
    • Tonality (Preference) Score is 3.23 and would be 5.85 with a perfect subwoofer.
      • Details: NBD: ON 0.553, LW 0.432, SP 0.366, PIR 0.365; SM: SP0.704, PIR0.274; LFQ 1.11, LFX 58Hz
    • Tonality (Preference) Score is 5.69 with an EQ and would be 7.83 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.437, LW 0.361, SP 0.323, PIR 0.31; SM: SP0.964, PIR0.934; LFQ 0.992, LFX 45Hz
  • Horizontal measurement
  • Link to Original review.
KEF Q650C
AutomaticEQ (IIR)
Set preamp gain to: -3.1dB.
Type Freq Q Gain
3 46.0 1.89 2.99
3 121.0 2.43 2.81
3 621.0 1.78 -2.58
3 942.0 2.99 3.0
3 6361.0 2.95 -0.92
3 9989.0 1.47 -3.15
3 14134.0 2.5 -3.27
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These EQ optimise the Harman score and is a good start for far field listening like in your living room.

KEF Q650C filters_auto_eq

AutomaticEQ

KEF Q650C filters_eq_full

Target v.s. EQ

KEF Q650C
Graphic EQ 15 bands
Set preamp gain to: -0.7dB.
Type Freq Q Gain
3 25.0 2.14 0.5
3 40.0 2.14 0.5
3 63.0 2.14 0.5
3 100.0 2.14 0.25
3 160.0 2.14 0.25
3 250.0 2.14 -0.25
3 400.0 2.14 -0.25
3 630.0 2.14 -0.5
3 1000.0 2.14 0.75
3 1600.0 2.14 0.0
3 2500.0 2.14 0.0
3 4000.0 2.14 0.0
3 6300.0 2.14 -0.5
3 10000.0 2.14 -0.5
3 16000.0 2.14 -0.5
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These EQ is designed for a 15 bands graphical EQ.

KEF Q650C
Graphic EQ 31 bands
Set preamp gain to: -0.8dB.
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 0.5
3 63.0 4.32 0.5
3 80.0 4.32 0.0
3 100.0 4.32 0.25
3 125.0 4.32 0.5
3 160.0 4.32 0.25
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 -0.25
3 500.0 4.32 -0.25
3 630.0 4.32 -0.5
3 800.0 4.32 0.0
3 1000.0 4.32 0.75
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 0.0
3 3150.0 4.32 0.0
3 4000.0 4.32 0.0
3 5000.0 4.32 -0.25
3 6300.0 4.32 -0.25
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 -0.5
3 20000.0 4.32 0.0
Download

These EQ is designed for a 31 bands graphical EQ.

KEF Q650C: comparison between EQs
KEF Q650C

Comparison betweens various EQs

KEF Q650C

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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