What we know about the measurement:

KLH 911B is a passive bookshelves

  • Quality of the measurement data is unknown.
  • Origin of the data is KLH.
  • Format of the data is .
  • Sensitivity: 86.8dB (avg. 100Hz-1kHz for 2.83V measured at 1m).
  • -3dB (resp. -6db) point v.s. reference is at 128.8Hz (resp. 106.8Hz).
  • Reference level is normalised to 0.5dB computed over the frequency range [300.0Hz, 5000.0Hz].
  • Frequency deviation is 5.4dB over the same frequency range.
  • Tonality (Preference) Score
    • Tonality (Preference) Score is 0.36 and would be 4.15 with a perfect subwoofer.
      • Details: NBD: ON 0.763, LW 0.679, SP 0.537, PIR 0.602; SM: SP0.312, PIR0.076; LFQ 0.666, LFX 109Hz
    • Tonality (Preference) Score is 4.7 with an EQ and would be 7.32 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.499, LW 0.421, SP 0.394, PIR 0.378; SM: SP0.933, PIR0.866; LFQ 0.578, LFX 58Hz
KLH 911B
AutomaticEQ (IIR)
Set preamp gain to: -5.1dB.
Type Freq Q Gain
PK 65.0 0.56 3.0
PK 160.0 1.85 -4.05
PK 166.0 0.25 3.0
PK 849.0 1.22 -2.17
PK 3912.0 2.41 -5.08
PK 8397.0 1.18 -5.82
PK 13652.0 1.01 -6.49
Download

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

KLH 911B filters_auto_eq

AutomaticEQ

KLH 911B filters_eq_full

Target v.s. EQ

KLH 911B
Graphic EQ 15 bands
Set preamp gain to: -1.1dB.
Type Freq Q Gain
PK 25.0 2.14 0.75
PK 40.0 2.14 0.75
PK 63.0 2.14 0.75
PK 100.0 2.14 0.75
PK 160.0 2.14 0.0
PK 250.0 2.14 0.25
PK 400.0 2.14 0.5
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 -0.25
PK 4000.0 2.14 -1.0
PK 6300.0 2.14 -0.5
PK 10000.0 2.14 -1.25
PK 16000.0 2.14 -0.75
Download

These EQ is designed for a 15 bands graphical EQ.

KLH 911B
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 0.5
PK 125.0 4.32 0.5
PK 160.0 4.32 0.0
PK 200.0 4.32 0.0
PK 250.0 4.32 0.25
PK 315.0 4.32 0.25
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 -0.25
PK 1000.0 4.32 -0.25
PK 1250.0 4.32 0.0
PK 1600.0 4.32 0.25
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 -0.75
PK 5000.0 4.32 -0.25
PK 6300.0 4.32 -0.5
PK 8000.0 4.32 -0.75
PK 10000.0 4.32 -1.0
PK 12000.0 4.32 -1.0
PK 16000.0 4.32 -0.75
PK 20000.0 4.32 0.0
Download

These EQ is designed for a 31 bands graphical EQ.

KLH 911B: comparison between EQs
KLH 911B

Comparison betweens various EQs

KLH 911B

Improvements made by EQ

Frequency Frequency with EQ
Frequency Frequency with EQ
Frequency Frequency with EQ
Frequency Frequency with EQ
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