What we know about the measurement:

KEF LS50 is a passive bookshelves speaker that cost around 1500USD 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 .
  • Sensitivity: 83.9dB (avg. 100Hz-1kHz for 2.83V measured at 1m)
  • -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.
  • Directivity
    • Horizontal directivity is (-50.0°, 50.0°) 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 4.7 and would be 6.9 with a perfect subwoofer.
      • Details: NBD: ON 0.6, LW 0.53, SP 0.43, PIR 0.43; SM: SP0.95, PIR0.84; LFQ 0.6, LFX 45Hz
    • Tonality (Preference) Score is 6.2 with an EQ and would be 8.2 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.35, LW 0.29, SP 0.29, PIR 0.24; SM: SP0.95, PIR0.93; LFQ 0.61, LFX 42Hz
  • Vertical measurement
  • Link to Original review.
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