What we know about the measurement:

KEF Reference 4C Meta is a passive center that cost around 8000 USD

  • Quality of the measurement data is medium.
  • Origin of the data is KEF.
  • Format of the data is .
  • Sensitivity: 88.7dB (avg. 100Hz-1kHz for 2.83V measured at 1m).
  • -3dB (resp. -6db) point v.s. reference is at 46.5Hz (resp. 32.9Hz).
  • Reference level is normalised to 0.6dB computed over the frequency range [300.0Hz, 5000.0Hz].
  • Frequency deviation is 1.7dB over the same frequency range.
  • Tonality (Preference) Score
    • Tonality (Preference) Score is 6.63 and would be 8.09 with a perfect subwoofer.
      • Details: NBD: ON 0.371, LW 0.256, SP 0.32, PIR 0.282; SM: SP0.973, PIR0.94; LFQ 0.936, LFX 31Hz
    • Tonality (Preference) Score is 7.24 with an EQ and would be 8.57 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.283, LW 0.194, SP 0.246, PIR 0.191; SM: SP0.972, PIR0.933; LFQ 0.936, LFX 29Hz
  • Note: the off-axis average curves are truncated at 200Hz as this is close to the LF cut-off limit of our anechoic chamber. The on-axis LF response has been compensated using ground plane measurements carried out in free-field and is therefore valid only for that singular curve..
KEF Reference 4C Meta
AutomaticEQ (IIR)
Set preamp gain to: -2.8dB.
Type Freq Q Gain
LS 58.0 0.76 2.98
PK 102.0 0.66 -1.95
PK 200.0 2.74 0.88
PK 342.0 1.77 1.62
PK 584.0 0.4 -1.12
PK 1032.0 2.51 1.84
PK 3325.0 1.66 1.12
PK 11077.0 2.09 0.92
PK 13997.0 0.73 1.16
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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 Reference 4C Meta filters_auto_eq

AutomaticEQ

KEF Reference 4C Meta filters_eq_full

Target v.s. EQ

KEF Reference 4C Meta
Graphic EQ 15 bands
Set preamp gain to: -0.6dB.
Type Freq Q Gain
PK 25.0 2.14 0.5
PK 40.0 2.14 0.5
PK 63.0 2.14 -0.25
PK 100.0 2.14 -0.25
PK 160.0 2.14 -0.25
PK 250.0 2.14 0.0
PK 400.0 2.14 0.0
PK 630.0 2.14 -0.25
PK 1000.0 2.14 0.0
PK 1600.0 2.14 0.0
PK 2500.0 2.14 0.0
PK 4000.0 2.14 0.0
PK 6300.0 2.14 -0.25
PK 10000.0 2.14 0.0
PK 16000.0 2.14 0.0
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These EQ is designed for a 15 bands graphical EQ.

KEF Reference 4C Meta
Graphic EQ 31 bands
Set preamp gain to: -0.7dB.
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 0.25
PK 63.0 4.32 -0.25
PK 80.0 4.32 -0.25
PK 100.0 4.32 -0.25
PK 125.0 4.32 -0.25
PK 160.0 4.32 -0.25
PK 200.0 4.32 0.0
PK 250.0 4.32 0.0
PK 315.0 4.32 0.25
PK 400.0 4.32 0.0
PK 500.0 4.32 0.0
PK 630.0 4.32 0.0
PK 800.0 4.32 0.0
PK 1000.0 4.32 0.25
PK 1250.0 4.32 0.0
PK 1600.0 4.32 0.0
PK 2000.0 4.32 0.25
PK 2500.0 4.32 0.0
PK 3150.0 4.32 0.25
PK 4000.0 4.32 0.25
PK 5000.0 4.32 0.25
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 0.25
PK 16000.0 4.32 0.25
PK 20000.0 4.32 0.0
Download

These EQ is designed for a 31 bands graphical EQ.

KEF Reference 4C Meta: comparison between EQs
KEF Reference 4C Meta

Comparison betweens various EQs

KEF Reference 4C Meta

Improvements made by EQ
CEA2034
CEA2034 Normalized
On Axis
Estimated In-Room Response
CEA2034
CEA2034 Normalized
On Axis
Estimated In-Room Response
Frequency Frequency with EQ
Frequency Frequency with EQ
Frequency Frequency with EQ
Frequency Frequency with EQ
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