What we know about the measurement:

KEF LS50 Wireless II is an active bookshelves that cost around 2800 USD for a pair.

  • Quality of the measurement data is high.
  • Origin of the data is ErinsAudioCorner.
  • Format of the data is generated by a Klippel NFS .
  • -3dB (resp. -6db) point v.s. reference is at 51.3Hz (resp. 45.4Hz).
  • Reference level is normalised to 0.1dB computed over the frequency range [300.0Hz, 5000.0Hz].
  • Frequency deviation is 3.0dB over the same frequency range.
  • Directivity
    • Horizontal directivity is (-60.0°, 60.0°) 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 5.65 and would be 7.73 with a perfect subwoofer.
      • Details: NBD: ON 0.41, LW 0.308, SP 0.31, PIR 0.276; SM: SP0.924, PIR0.817; LFQ 0.676, LFX 43Hz
    • Tonality (Preference) Score is 6.55 with an EQ and would be 8.56 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.329, LW 0.228, SP 0.211, PIR 0.173; SM: SP0.98, PIR0.955; LFQ 0.676, LFX 42Hz
  • Link to original Review: eac review. Links to other reviews: yt review .
KEF LS50 Wireless II
AutomaticEQ (IIR)
Set preamp gain to: -2.5dB.
Type Freq Q Gain
HS 62.0 0.89 -2.68
PK 109.0 0.69 -2.36
PK 158.0 1.9 0.93
PK 844.0 2.06 -1.47
PK 1103.0 2.47 2.45
PK 2909.0 1.51 2.22
PK 3801.0 1.84 -1.11
PK 4966.0 0.89 0.09
LS 14473.0 1.14 2.65
Download

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

KEF LS50 Wireless II filters_auto_eq

AutomaticEQ

KEF LS50 Wireless II filters_eq_full

Target v.s. EQ

KEF LS50 Wireless II
Graphic EQ 15 bands
Set preamp gain to: -0.7dB.
Type Freq Q Gain
PK 25.0 2.14 0.25
PK 40.0 2.14 0.25
PK 63.0 2.14 0.0
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 0.25
PK 630.0 2.14 0.0
PK 1000.0 2.14 0.5
PK 1600.0 2.14 0.5
PK 2500.0 2.14 0.5
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 0.25
Download

These EQ is designed for a 15 bands graphical EQ.

KEF LS50 Wireless II
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 0.25
PK 31.0 4.32 0.25
PK 40.0 4.32 0.25
PK 50.0 4.32 0.25
PK 63.0 4.32 0.0
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 0.0
PK 400.0 4.32 0.25
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 0.5
PK 1250.0 4.32 0.5
PK 1600.0 4.32 0.5
PK 2000.0 4.32 0.5
PK 2500.0 4.32 0.5
PK 3150.0 4.32 0.5
PK 4000.0 4.32 0.25
PK 5000.0 4.32 0.25
PK 6300.0 4.32 0.25
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 LS50 Wireless II: comparison between EQs
KEF LS50 Wireless II

Comparison betweens various EQs

KEF LS50 Wireless II

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
;