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 estimated 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: Data computed by KEF is precise above 300Hz, the on axis is corrected below that. The other curves are interpolated below 300Hz and are not very precise..
KEF Reference 4C Meta
AutomaticEQ (IIR)
Set preamp gain to: -2.8dB.
Type Freq Q Gain
5 58.0 0.76 2.98
3 102.0 0.66 -1.95
3 200.0 2.74 0.88
3 342.0 1.77 1.62
3 584.0 0.4 -1.12
3 1032.0 2.51 1.84
3 3325.0 1.66 1.12
3 11077.0 2.09 0.92
3 13997.0 0.73 1.16
Download

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
3 25.0 2.14 0.5
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 -0.25
3 250.0 2.14 0.0
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 0.0
3 2500.0 2.14 0.0
3 4000.0 2.14 0.0
3 6300.0 2.14 -0.25
3 10000.0 2.14 0.0
3 16000.0 2.14 0.0
Download

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
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 0.25
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 -0.25
3 200.0 4.32 0.0
3 250.0 4.32 0.0
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 0.0
3 800.0 4.32 0.0
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 0.25
3 2500.0 4.32 0.0
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 0.0
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.

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

Comparison betweens various EQs

KEF Reference 4C Meta

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