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
3 65.0 0.56 3.0
3 160.0 1.85 -4.05
3 166.0 0.25 3.0
3 849.0 1.22 -2.17
3 3912.0 2.41 -5.08
3 8397.0 1.18 -5.82
3 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
3 25.0 2.14 0.75
3 40.0 2.14 0.75
3 63.0 2.14 0.75
3 100.0 2.14 0.75
3 160.0 2.14 0.0
3 250.0 2.14 0.25
3 400.0 2.14 0.5
3 630.0 2.14 0.0
3 1000.0 2.14 -0.5
3 1600.0 2.14 0.5
3 2500.0 2.14 -0.25
3 4000.0 2.14 -1.0
3 6300.0 2.14 -0.5
3 10000.0 2.14 -1.25
3 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
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 0.5
3 63.0 4.32 0.5
3 80.0 4.32 0.5
3 100.0 4.32 0.5
3 125.0 4.32 0.5
3 160.0 4.32 0.0
3 200.0 4.32 0.0
3 250.0 4.32 0.25
3 315.0 4.32 0.25
3 400.0 4.32 0.25
3 500.0 4.32 0.0
3 630.0 4.32 0.0
3 800.0 4.32 -0.25
3 1000.0 4.32 -0.25
3 1250.0 4.32 0.0
3 1600.0 4.32 0.25
3 2000.0 4.32 0.0
3 2500.0 4.32 -0.25
3 3150.0 4.32 -0.5
3 4000.0 4.32 -0.75
3 5000.0 4.32 -0.25
3 6300.0 4.32 -0.5
3 8000.0 4.32 -0.75
3 10000.0 4.32 -1.0
3 12000.0 4.32 -1.0
3 16000.0 4.32 -0.75
3 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
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