What we know about the measurement:

KEF LS50 is a passive bookshelves that cost around 1500 USD for a pair.

  • Quality of the measurement data is high.
  • Origin of the data is ASR.
  • Format of the data is generated by a Klippel NFS .
  • -3dB (resp. -6db) point v.s. reference is at 82.8Hz (resp. 49.1Hz).
  • Reference level is normalised to 0.6dB computed over the frequency range [300.0Hz, 5000.0Hz].
  • Frequency deviation is 3.9dB over the same frequency range.
  • Tonality (Preference) Score
    • Tonality (Preference) Score is 4.47 and would be 6.69 with a perfect subwoofer.
      • Details: NBD: ON 0.6, LW 0.526, SP 0.428, PIR 0.437; SM: SP0.953, PIR0.783; LFQ 0.546, LFX 47Hz
    • Tonality (Preference) Score is 6.11 with an EQ and would be 8.18 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.372, LW 0.312, SP 0.307, PIR 0.259; SM: SP0.967, PIR0.95; LFQ 0.546, LFX 43Hz
  • Vertical measurement
  • Link to Original review.
KEF LS50
AutomaticEQ (IIR)
Set preamp gain to: -2.3dB.
Type Freq Q Gain
LS 102.0 0.48 2.96
PK 404.0 1.17 0.88
PK 584.0 2.47 2.23
PK 817.0 2.02 -1.24
PK 1541.0 2.55 2.96
PK 2813.0 1.97 -0.55
PK 4803.0 2.78 -2.85
PK 7669.0 0.72 1.54
LS 14965.0 0.76 -0.64
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This EQ optimise the Harman score and is a good start for far field listening like in your living room.
KEF LS50
flipflop@ASR (IIR)
Set preamp gain to: -1.2dB.
Type Freq Q Gain
PK 466.0 4.209 -0.6
PK 527.0 1.889 2.2
PK 857.0 1.0 -2.7
PK 1224.0 5.0 -2.0
PK 1459.0 1.123 4.6
PK 1639.0 4.703 -11.5
PK 1645.0 4.807 11.7
PK 2285.0 1.0 -3.1
PK 2400.0 18.0 -0.6
PK 4429.0 1.0 -1.4
PK 4873.0 5.0 -2.3
PK 6985.0 4.998 -2.1
PK 8917.0 5.0 -3.4
PK 10636.0 5.0 -3.1
PK 11460.0 5.0 -2.2
PK 12192.0 1.001 12.0
PK 13179.0 1.386 -12.3
PK 14084.0 5.0 1.2
PK 16192.0 5.0 -1.5
PK 17760.0 5.0 -1.6
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This EQ is designed by ASR member flipflop.
KEF LS50
Graphic EQ 15 bands
Set preamp gain to: -0.7dB.
Type Freq Q Gain
PK 25.0 2.14 0.5
PK 40.0 2.14 0.5
PK 63.0 2.14 0.5
PK 100.0 2.14 0.25
PK 160.0 2.14 -0.25
PK 250.0 2.14 -0.25
PK 400.0 2.14 0.0
PK 630.0 2.14 0.0
PK 1000.0 2.14 -0.25
PK 1600.0 2.14 0.25
PK 2500.0 2.14 -0.5
PK 4000.0 2.14 -0.5
PK 6300.0 2.14 -0.25
PK 10000.0 2.14 0.0
PK 16000.0 2.14 0.0
Download
This EQ is designed for a 15 bands graphical EQ.
KEF LS50
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 0.25
PK 125.0 4.32 0.0
PK 160.0 4.32 -0.25
PK 200.0 4.32 -0.25
PK 250.0 4.32 0.0
PK 315.0 4.32 0.0
PK 400.0 4.32 0.0
PK 500.0 4.32 0.25
PK 630.0 4.32 0.0
PK 800.0 4.32 -0.25
PK 1000.0 4.32 0.0
PK 1250.0 4.32 0.0
PK 1600.0 4.32 0.5
PK 2000.0 4.32 0.0
PK 2500.0 4.32 -0.25
PK 3150.0 4.32 -0.5
PK 4000.0 4.32 -0.5
PK 5000.0 4.32 -0.5
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 0.0
PK 20000.0 4.32 0.0
Download
This EQ is designed for a 31 bands graphical EQ.
Improvement made by adding the above EQ
EQ
AutoEQ
Target v.s. EQ
Target v.s. EQ
Histogram of errors
On Axis (fullrange)
Listening Window (fullrange)
Predicted In-Room Response (fullrange)
KEF LS50: comparison between EQs
AutomaticEQ
Target v.s. EQ
Comparison betweens various EQs
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